├── LICENSE ├── PROGRAMMING.md ├── README.md ├── TODO.md ├── esp8266_wifi_tx.ino └── web ├── esp8266-reflash.png ├── esp8266.jpg ├── s-l500.jpg └── youtube.png /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. By contrast, 15 | the GNU General Public License is intended to guarantee your freedom to 16 | share and change all versions of a program--to make sure it remains free 17 | software for all its users. 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It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | {one line to give the program's name and a brief idea of what it does.} 635 | Copyright (C) {year} {name of author} 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | {project} Copyright (C) {year} {fullname} 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /PROGRAMMING.md: -------------------------------------------------------------------------------- 1 | This code was developed using the following: 2 | 3 | Arduino IDE version: 1.6.4 4 | 5 | AND: 6 | 7 | "Arduino core for ESP8266 WiFi chip" 8 | 9 | see https://github.com/esp8266/Arduino 10 | 11 | In brief: 12 | 13 | Start Arduino and open Preferences window. 14 | 15 | Enter http://arduino.esp8266.com/stable/package_esp8266com_index.json into Additional Board Manager URLs field. 16 | 17 | Open Boards Manager from Tools > Board menu and install esp8266 platform 18 | 19 | 20 | 21 | Depending on the specific ESP8266 based board, you will need to determine how you program it. 22 | 23 | lots of slightly different boards: 24 | 25 | http://l0l.org.uk/2014/12/esp8266-modules-hardware-guide-gotta-catch-em-all/ 26 | 27 | eg1: 28 | 29 | With a pcb labeled 'nodemcu devkit 0.9', this has a USB port, and runs serial-over-usb with a CH340 chip ( it's just like a FTDI, only chinese and needs a different driver ). 30 | This particular board supports a "reset method" of "nodemcu", and as a result can be programmed just like an Arduino ( no special actions required ). 31 | 32 | eg2: 33 | 34 | With a board that does NOT have USB, it will have TX, RX, GND pins ( connect these to your favourite FTDI or similar USB-to-serial cable ) , AND also GPIO0 is important. 35 | To program these, you need to: 36 | 37 | 1 - connect GPIO0 to GND 38 | 39 | 2 - power it on 40 | 41 | 3 - reflash ( Press Upload) with the Arduino IDE. 42 | 43 | 4 - disconnect GPIO0 from GND 44 | 45 | 5 - reboot ( disconnect and reconnect power ) 46 | 47 | 48 | https://learn.sparkfun.com/tutorials/esp8266-wifi-shield-hookup-guide/re-programming-the-esp8266 49 | 50 | http://iot-playground.com/2-uncategorised/38-esp8266-and-arduino-ide-blink-example 51 | 52 | 53 | ![How to wire the Classic ESP8266](/web/esp8266-reflash.png?raw=true "How to wire the Classic ESP8266") 54 | 55 | 56 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # esp8266_wifi_tx 2 | Make two ESP8266 wifi modules into a RC Transmitter and RC Reciever! 3 | 4 | THis same code can be flashed to BOTH units, with just a 1 line edit to decide which is TX and which is RX. 5 | Line ( approx ) 248, where variable AP_OR_STA is hard-coded decides if you are programming for a TX ( WIFI_AP ) or RX ( WIFI_STA) 6 | 7 | HARDWARE SETUP: 8 | 9 | PPM IN is wired to the esp8266 in the TX, on GPIO13, or ~D7 ( depending on your labels ) see PPMINPIN define in the code. 10 | 11 | PPM OUT is wired to the esp8266 in the RX, on GPIO12, or ~D6 ( depending on your labels ) see PPMOUTPIN define in the code. 12 | 13 | There's also a debug pin for the oscilloscope called TRIGGERPIN which is GPIO14 or ~D5 ( depending on your labels ) - not used normally. 14 | 15 | UDP packet format: 16 | 17 | Inline with the KISS principle, I've just allocated 16bits (two bytes) to each channel in the PPM stream, that's it. 18 | 19 | So a UDP packet from port 5554 with a 16byte data/payload is used for when we have 8 PPM channels ( 1-8 ). 8 is the MINIMUM supported. 20 | 21 | Conversely, If the PPM stream from the TX has 16 channels ( 1-16 ), then the UDP packets it generates will have 32bytes of data payload. 16 is the MAXIMUM supported. 22 | 23 | see also TODO file. 24 | 25 | ![Classic ESP8266 module](/web/esp8266.jpg?raw=true "Classic ESP8266 module") 26 | 27 | ![Example Dev PCB with ESP8266 module](/web/s-l500.jpg?raw=true "Example Dev PCB with ESP8266 module]") 28 | 29 | [![See a video of the prototype here](http://img.youtube.com/vi/6-0GJ21oUO4/0.jpg)](http://www.youtube.com/watch?v=6-0GJ21oUO4) 30 | 31 | (c) David "Buzz" Bussenschutt 20 Jan 2016 -------------------------------------------------------------------------------- /TODO.md: -------------------------------------------------------------------------------- 1 | TODO: you must poweron the TX before you power on the RX, as the tx is a wifi "access point", and the RX will not be able to "join" the network if its not there. Similarly, if the TX looses power for any reason, the RX will NOT reconnect, and you need to reboot the RX afterward. 2 | 3 | TODO: the PPM input pulses from the TX are NOT read using a "timer capture" or interrupt routine, instead via a busy-wait loop. This can result in some jitter, so we have a dead-band in software to minimise this. Better to to it right. 4 | 5 | TODO: there's code in here to allow these wifi devices to have a webserver ( each, etc ), but at the moment, there's just a holding page, and it's not used. Would be excellent to reconfigure the SSID and password , and other things ,here. 6 | 7 | TODO: there is code to support MDNS and SSDP protocol/s, but neither of these is actively used right now, and neither is properly tested. they might be good to use in the future tho. 8 | 9 | TODO: the bushbutton code only works on the 'nodemcu' dev board that has USB and a push button labeled 'USER'. need to simplify this and generalise it. in the mean time, just change the AP_OR_STA variable before flashing it. 10 | 11 | TODO: there are more minor code issues in-line, search for 'TODO' below. :-) 12 | 13 | 14 | NOTE: the PPM input pulses from the TX itself into the esp8266 can be any number from 8-16 long, but must idle "HIGH" when looked at in oscilloscope. ( this is normal for most PPM ) 15 | 16 | NOTE: The esp8266 that is in the TX sends UDP packets to the BROADCAST address of the network it's on( 192.168.4.255 ), on port 5554 (no particular reason for this number) , and all RX client/s can listen for these and turn them into PPM output stream. 17 | 18 | NOTE: when you connect to the SERIAL interface of these device/s, they give you some debug info about what hte system is doing ( during startup), or a listof all the channel values as they are "live" ( just before being TX'd, or just after being RX'd, as appropriate ) 19 | -------------------------------------------------------------------------------- /esp8266_wifi_tx.ino: -------------------------------------------------------------------------------- 1 | // 2 | // Make two ESP8266 wifi modules into a RC Transmitter and RC Reciever! 3 | // THis same code below can be flashed to BOTH units, with just a 1 line edit to decide which is TX and which is RX. 4 | // Line 248, where variable AP_OR_STA is hard-coded decides if you are programming for a TX ( WIFI_AP ) or RX ( WIFI_STA) 5 | // 6 | // TODO: you must poweron the TX before you power on the RX, as the tx is a wifi "access point", and the RX will not be able to "join" the network if its not there. 7 | // TODO: the PPM input pulses from the TX are NOT read using a "timer capture" or interrupt routine, instead via a busy-wait loop. This can result in some jitter, so we have a dead-band in software to minimise this. Better to to it right. 8 | // TODO: there's code in here to allow these wifi devices to have a webserver ( each, etc ), but at the moment, there's just a holding page, and it's not used. Would be excellent to reconfigure the SSID and password , and other things ,here. 9 | // TODO: there is code to support MDNS and SSDP protocol/s, but neither of these is actively used right now, and neither is properly tested. they might be good to use in the future tho. 10 | // TODO: the bushbutton code only works on the 'nodemcu' dev board that has USB and a push button labeled 'USER'. need to simplify this and generalise it. in the mean time, just change the AP_OR_STA variable before flashing it. 11 | // TODO: there are more minor code issues in-line, search for 'TODO' below. :-) 12 | 13 | // NOTE: the PPM input pulses from the TX itself into the esp8266 can be any number from 8-16 long, but must idle "HIGH" when looked at in oscilloscope. ( this is normal for most PPM ) 14 | // NOTE: The esp8266 that is in the TX sends UDP packets to the BROADCAST address of the network it's on( 192.168.4.255 ), on port 5554 (no particular reason for this number) , and all RX client/s can listen for these and turn them into PPM output stream. 15 | // NOTE: when you connect to the SERIAL interface of these device/s, they give you some debug info about what hte system is doing ( during startup), or a listof all the channel values as they are "live" ( just before being TX'd, or just after being RX'd, as appropriate ) 16 | 17 | // HARDWARE SETUP: 18 | // PPM IN is wired to the esp8266 in the TX, on GPIO13, or ~D7 ( depending on your labels ) see PPMINPIN define in the code. 19 | // PPM OUT is wired to the esp8266 in the RX, on GPIO12, or ~D6 ( depending on your labels ) see PPMOUTPIN define in the code. 20 | // there's also a debug pin for the oscilloscope called TRIGGERPIN which is GPIO14 or ~D5 ( depending on your labels ) - not used normally. 21 | 22 | // UDP packet format: 23 | // Inline with the KISS principle, I've just allocated 16bits (two bytes) to each channel in the PPM stream, that's it. 24 | // So a UDP packet from port 5554 with a 16byte data/payload is used for when we have 8 PPM channels ( 1-8 ). 8 is the MINIMUM supported. 25 | // Conversely, If the PPM stream from the TX has 16 channels ( 1-16 ), then the UDP packets it generates will have 32bytes of data payload. 16 is the MAXIMUM supported. 26 | // 27 | 28 | // 29 | // additianl references: 30 | // https://github.com/jorisplusplus/AR.Drone-ESP8266/blob/master/Drone.ino 31 | // and many other places. 32 | // 33 | // (c) David "Buzz" Bussenschutt 20 Jan 2016 34 | 35 | #include 36 | #include 37 | #include 38 | #include 39 | #include 40 | // can remove these if SSDP andor mDNS arent used. 41 | #include 42 | #include 43 | 44 | /* extern "C" { 45 | #include "ets_sys.h" 46 | #include "os_type.h" 47 | #include "osapi.h" 48 | #include "mem.h" 49 | #include "user_interface.h" 50 | #include "cont.h" 51 | } 52 | */ 53 | 54 | /* 55 | unsigned char softap_stations_cnt; 56 | struct station_info *stat_info; 57 | struct ip_addr *xIPaddress; 58 | uint32 uintaddress; 59 | 60 | needed for WIFI callbacks only. 61 | extern "C" { 62 | #include "user_interface.h" 63 | #include "ip_addr.h" 64 | #include "mem.h" 65 | 66 | void _onWiFiEvent(System_Event_t *event){ 67 | if(event->event == EVENT_SOFTAPMODE_STACONNECTED){ 68 | Event_SoftAPMode_StaConnected_t *data = (Event_SoftAPMode_StaConnected_t *)(&event->event_info.sta_connected); 69 | Serial.printf("Station Connected: id: %d, mac: " MACSTR "\n", data->aid, MAC2STR(data->mac)); 70 | delay(2000) ; // ot give it time to get an IP 71 | softap_stations_cnt = wifi_softap_get_station_num(); 72 | stat_info = wifi_softap_get_station_info(); 73 | Serial.println(softap_stations_cnt); 74 | } 75 | if(event->event == EVENT_SOFTAPMODE_STADISCONNECTED){ 76 | Event_SoftAPMode_StaDisconnected_t *data = (Event_SoftAPMode_StaDisconnected_t *)(&event->event_info.sta_disconnected); 77 | Serial.printf("Station Disconnected: id: %d, mac: " MACSTR "\n", data->aid, MAC2STR(data->mac)); 78 | } 79 | // unfortunately, this even does not work in SOFTAP mode, so it's useless to us. 80 | if(event->event == EVENT_STAMODE_GOT_IP){ 81 | Event_StaMode_Got_IP_t *data = (Event_StaMode_Got_IP_t *)(&event->event_info.got_ip); 82 | Serial.printf("Station got IP: ip: %d \n", data->ip); 83 | } 84 | 85 | } 86 | } 87 | #include "user_interface.h" 88 | 89 | */ 90 | 91 | 92 | // as an AP: 93 | const char *APssid = "WIFI_TX"; 94 | const char *APpassword = "password"; 95 | 96 | // as a client of a real WIFI network: 97 | //const char *ssid = "MY_HOME_NETWORK"; 98 | //const char *password = "my_home_network_password"; 99 | // as a client of the TX wifi network: 100 | const char *ssid = "WIFI_TX"; 101 | const char *password = "password"; 102 | 103 | // We can send UDP data to specific "connected clients", or we can just BROADCAST it. 104 | // when doing the "specific clients", ATM we only send to IP's that have just done an HTTP request to our server! 105 | #define BROADCAST_UDP 1 106 | const int navPort = 5554; 107 | WiFiUDP Udp; // this will be the BROADCAST address we send to, if we use it. 108 | 109 | ESP8266WebServer HTTP(80); 110 | 111 | MDNSResponder mdns; 112 | 113 | 114 | volatile int _rising = 0; 115 | 116 | // 2 or 12 are probably ok. 2=NODEMCU_D4, 12=NODEMCU_D6 117 | //#define INTERUPT_PIN 12 118 | /* 119 | NodeMCU labels table for GPIO 120 | // http://www.14core.com/wp-content/uploads/2015/06/Node-MCU-Pin-Out-Diagram1.png 121 | ~D6 = 12 / / HMISO 122 | ~D7 = 13 / RXD2 / HMOSI 123 | ~D5 = 14 124 | */ 125 | 126 | // list of currently connected clients ( that are getting a UDP strream sent ot them) 127 | // max of 4 because 'conf.max_connection = 4' in ESP8266WiFi.cpp 128 | 129 | #if BROADCAST_UDP == 0 130 | IPAddress clients[4]; 131 | int last_client_idx = 0; 132 | #else 133 | IPAddress broadcast; 134 | #endif 135 | // us, once we know it. 136 | IPAddress myIP; 137 | 138 | // buff for recieving UDP when in STA mode. 139 | char incoming[1024]; 140 | 141 | 142 | void handleHTTP() { 143 | HTTP.send(200, "text/html", "

You are at the future WiFi TX module config page.

"); 144 | Serial.print("an http client connected, fyi.\n"); 145 | WiFiClient x = HTTP.client(); 146 | #if BROADCAST_UDP == 0 147 | IPAddress i = x.remoteIP(); 148 | Serial.println(i); 149 | // make sure cleint/s are unique 150 | if ( ! is_existing(i) ) { 151 | clients[last_client_idx] = i; 152 | last_client_idx++; 153 | Serial.print("NEW UDP client detected ... streaming started! n"); 154 | } else { 155 | Serial.print("EXISTING UDP client - streaming already!\n"); 156 | } 157 | #endif 158 | } 159 | #if BROADCAST_UDP == 0 160 | bool is_existing(IPAddress x ){ 161 | for ( int e = 0 ; e < last_client_idx ; e++ ) { 162 | if (clients[e] == x ) return true; 163 | } 164 | return false; 165 | } 166 | #endif 167 | 168 | //NON-interrupt based PPMIN, seems pretty good with a processor this fast... 169 | 170 | //TODO WE NEED A BETTER METHOD OF KEEPING THE "channel_count" ( ie the number of pulses in a ppm frame ) in SYNC with the actual DATA we have coming IN 171 | // at teh moment, if the actuals are LESS than the 16, it'll be OK, and auto-shrink, but if the channel counts go back UP ( eg, from 8-16 ) we need to reboot both ends for that to work. ( BAD ) 172 | 173 | // these two need to match: 174 | unsigned int channel_count = 16; // start assuming 16, we'll automatically move to less ( but no less than 8 ) if we detect we can...? 175 | // an 'unsigned short' on the esp8266 is TWO bytes each, and we use this as it's max value is 60000, and that's heaps, as we generally should not go over 2000. 176 | // its unsigned, as we don't want weird wrap-arounds to negative numbers to screw us if I got this wrong. 177 | unsigned short pulselens[] = { 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16 } ; 178 | 179 | 180 | #define PPMINPIN 13 181 | #define PPMOUTPIN 12 182 | #define TRIGGERPIN 14 183 | 184 | void ppm_setup() { 185 | 186 | pinMode(PPMOUTPIN, OUTPUT); //GPIO12 = nodemcu ~D6 187 | pinMode(TRIGGERPIN, OUTPUT); //GPIO14 = nodemcu ~D5 188 | pinMode(PPMINPIN, INPUT); //GPIO13 = nodemcu ~D7 189 | /* 190 | pinMode(14, OUTPUT); 191 | pinMode(15, OUTPUT); 192 | pinMode(16, OUTPUT); 193 | */ 194 | 195 | } 196 | 197 | // nodemcu button is plexed with the LED for some weird reason. 198 | const int buttonPin = 16; 199 | void button_enable() 200 | { 201 | bool enabled = true; 202 | pinMode(buttonPin, OUTPUT); 203 | digitalWrite(buttonPin, enabled ? HIGH : LOW); 204 | if (enabled) pinMode(buttonPin, INPUT); 205 | } 206 | // nodemcu button is plexed with the LED for some weird reason. 207 | void button_disable() 208 | { 209 | bool enabled = false; 210 | pinMode(buttonPin, OUTPUT); 211 | digitalWrite(buttonPin, enabled ? HIGH : LOW); 212 | if (enabled) pinMode(buttonPin, INPUT); 213 | } 214 | // nodemcu button is plexed with the LED for some weird reason. 215 | void flash() 216 | { 217 | for (int i = 0; i < 5; i++) 218 | { 219 | button_disable(); // Toggle button makes LED go on/off 220 | delay(100); 221 | button_enable(); // Toggle button makes LED go on/off 222 | delay(100); 223 | } 224 | } 225 | // nodemcu button is plexed with the LED for some weird reason. 226 | void button_setup() 227 | { 228 | button_enable(); 229 | flash(); 230 | } 231 | //bool wait_for_release = false; 232 | // nodemcu button is plexed with the LED for some weird reason. 233 | bool check_button() 234 | { 235 | if (digitalRead(buttonPin) == HIGH) 236 | { 237 | //wait_for_release = true; 238 | return false; 239 | } 240 | return true; 241 | //else if (wait_for_release) 242 | //{ 243 | // wait_for_release = false; 244 | 245 | // flash(); 246 | //} 247 | } 248 | // nodemcu button is plexed with the LED for some weird reason. 249 | 250 | 251 | // will we be one of the other, default to AP! if button pressed, we'll be an STA 252 | int AP_OR_STA = WIFI_AP; 253 | 254 | //SETUP SETUP SETUP SETUP SETUP SETUP SETUP SETUP SETUP SETUP SETUP SETUP 255 | //SETUP SETUP SETUP SETUP SETUP SETUP SETUP SETUP SETUP SETUP SETUP SETUP 256 | void setup(void) { 257 | Serial.begin(115200); 258 | Serial.println(""); 259 | Serial.println("Starting"); 260 | 261 | //wifi_set_event_handler_cb(_onWiFiEvent); 262 | 263 | ppm_setup(); 264 | 265 | button_setup(); 266 | 267 | if (check_button() ) { 268 | AP_OR_STA = WIFI_STA; 269 | Serial.println("Please release push button ! "); 270 | } 271 | // temp TODO HACK, forcong AP mode.. 272 | AP_OR_STA = WIFI_AP; 273 | 274 | // be an AP 275 | if ( AP_OR_STA == WIFI_AP ) { 276 | Serial.print("Configuring as access point... "); 277 | Serial.print(" SSID:"); 278 | Serial.print(APssid); 279 | Serial.print(" password:"); 280 | Serial.println(APpassword); 281 | 282 | /* You can remove the password parameter if you want the AP to be open. */ 283 | WiFi.disconnect(); 284 | WiFi.mode(WIFI_AP); // without this softap can't do multicast udp. 285 | WiFi.softAP(APssid, APpassword); 286 | 287 | myIP = WiFi.softAPIP(); 288 | Serial.print("AP IP address: "); 289 | Serial.println(myIP); 290 | 291 | //delay(1000); // time for AP to startt up and send beacon.. 292 | 293 | } 294 | 295 | // DONT be an AP 296 | if ( AP_OR_STA == WIFI_STA ){ 297 | Serial.print("Configuring as Station, NOT AP..."); 298 | // Connect to pre-existing WiFi network with WIFI_STA 299 | WiFi.disconnect(); 300 | WiFi.mode(WIFI_STA); // WIFI_AP or WIFI_STA 301 | WiFi.begin(ssid,password ); 302 | 303 | // Wait for connection 304 | Serial.println("trying to connect to WIFI....."); 305 | int tries = 0; 306 | while ((WiFi.status() != WL_CONNECTED ) && (tries < 50 ) ){ 307 | Serial.println("....."); 308 | delay(200); 309 | tries++; 310 | } 311 | //WIFI fail 312 | if (tries >= 30 ) { 313 | // REBOOT 314 | ESP.restart(); 315 | } 316 | 317 | Serial.println("Connected!"); 318 | myIP = WiFi.localIP(); 319 | Serial.print("STA IP address: "); 320 | Serial.println(myIP); 321 | } 322 | 323 | // set these to either '0' or '1' 324 | #define IS_HTTP_SERVER 1 325 | #define IS_SSDP_SERVER 0 326 | #define IS_MDNS_SERVER 0 327 | 328 | #if IS_SSDP_SERVER == 1 329 | #if IS_HTTP_SERVER == 0 330 | #error "can't enable SSDP without HTTP, sorry! " 331 | #endif 332 | #endif 333 | 334 | 335 | // be a HTTP server: - not totally critical for this, but it's working, so we might use it later for config. 336 | if ( IS_HTTP_SERVER ) { 337 | HTTP.on("/", handleHTTP); 338 | HTTP.on("/index.html", handleHTTP); // same as above 339 | Serial.println("HTTP server started"); 340 | } 341 | 342 | // be a SSDP server too: 343 | if ( IS_SSDP_SERVER ) { 344 | HTTP.on("/description.xml", HTTP_GET, [](){ 345 | SSDP.schema(HTTP.client()); 346 | }); 347 | } 348 | if ( IS_SSDP_SERVER || IS_HTTP_SERVER ) { 349 | HTTP.begin(); 350 | } 351 | 352 | //TODO TEST IF SSDP AND MDNS is actually working as it should. is is sending packets etc? 353 | if ( IS_SSDP_SERVER == 1 ) { 354 | Serial.print("Starting SSDP...\n"); 355 | SSDP.setSchemaURL("description.xml"); 356 | SSDP.setHTTPPort(80); 357 | SSDP.setName("ESP8266 WIFI TX"); 358 | SSDP.setSerialNumber("001122334455"); 359 | SSDP.setURL("index.html"); 360 | SSDP.setModelName("Buzzs ESP8266 WIFI TX 2016"); 361 | SSDP.setModelNumber("001122334455"); 362 | SSDP.setModelURL("http://github.com/davidbuzz/"); 363 | SSDP.setManufacturer("David / Buzz"); 364 | SSDP.setManufacturerURL("http://github.com/davidbuzz/"); 365 | SSDP.begin(); 366 | Serial.print("SSDP done.\n"); 367 | 368 | } 369 | 370 | // mDNS 371 | char hostname [12+1]; 372 | strcpy (hostname,"esp8266"); 373 | if ( IS_MDNS_SERVER == 1) { 374 | if (mdns.begin(hostname)) { 375 | Serial.println("MDNS responder started"); 376 | } else { 377 | Serial.println("MDNS responder FAILED to start"); 378 | } 379 | } 380 | 381 | 382 | Serial.println("Other Nearby WIFI networks, just a FYI... "); 383 | // review wifi info... scan takes approx 2 secs... 384 | String _ssid; 385 | uint8_t encryptionType; 386 | int32_t RSSI; 387 | uint8_t* BSSID; 388 | int32_t channel; 389 | bool isHidden; 390 | int netcount = WiFi.scanNetworks(); 391 | for (int n = 0; n < netcount; n++) { 392 | WiFi.getNetworkInfo(n, _ssid, encryptionType, RSSI, BSSID, channel, isHidden); 393 | Serial.println(String("SSID : ") + _ssid); 394 | Serial.println(String("encryptionType : ") + encryptionType); 395 | Serial.println(String("RSSI : ") + RSSI); 396 | Serial.println(String("Channel : ") + channel); 397 | Serial.println(String("Hidden : ") + isHidden); 398 | Serial.println(); 399 | } 400 | 401 | // from out IP, determine broadcast IP , assuming class C ( /24 ) network. 402 | #if BROADCAST_UDP == 1 403 | broadcast = myIP; 404 | broadcast[3] = 255; 405 | #endif 406 | 407 | // we listen, all the time, for UDP data coming IN. 408 | if ( AP_OR_STA == WIFI_STA ){ 409 | Udp.begin(navPort); //Open port for navdata 410 | Udp.flush(); 411 | } 412 | 413 | if ( AP_OR_STA == WIFI_AP ){ 414 | Serial.println("Starting main loop ( Listening for PPMIN on GPIO13, aka ~7 on a modemcu ) "); // see PPMINPIN 415 | } else { 416 | Serial.println("Starting main loop ( Waiting for UDP on 5554, and PPMOUT on GPIO12, aka ~6 on a modemcu ) "); // see PPMOUTPIN 417 | } 418 | 419 | } 420 | 421 | 422 | inline short read_pulse_len(bool trace){ 423 | int x = 0 ; 424 | // wait for edge to RISE 425 | while ( x == 0 ) { 426 | x = digitalRead(PPMINPIN ) ; 427 | ESP.wdtFeed(); // in the event we don't have good PPM pulses, we can hang here, but we don't want to crash/reboot. 428 | } 429 | if ( trace ) digitalWrite(PPMOUTPIN,x); // for DEBUG ONLY. 430 | short risestart = micros(); 431 | 432 | // wait for edge to FALL 433 | while ( x == 1 ) { 434 | x = digitalRead(PPMINPIN ) ; 435 | ESP.wdtFeed(); // in the event we don't have good PPM pulses, we can hang here, but we don't want to crash/reboot. 436 | } 437 | if ( trace ) digitalWrite(PPMOUTPIN,x); // for DEBUG ONLY. 438 | //delayMicroseconds(50); // for debug only - so last/8th channel shows up on trace better. 439 | // if rise length > some amount, continue 440 | short riseend = micros(); 441 | 442 | short risetime = ( riseend - risestart ); 443 | return risetime; 444 | } 445 | 446 | 447 | 448 | 449 | // if there's been any change in the data, and we'll be formulating a new UDP packet.. 450 | int udpnew = 0; 451 | 452 | // FYI: PPM frames repeat approx every 20-22ms, so 50frames = approx 1sec., so we'll send one UDP every 25 frames for 2hz 453 | int recentframes = 0; 454 | 455 | 456 | unsigned long sta_runtime = micros(); 457 | 458 | 459 | //LOOP LOOP LOOP LOOP LOOP LOOP LOOP LOOP LOOP LOOP LOOP LOOP 460 | //LOOP LOOP LOOP LOOP LOOP LOOP LOOP LOOP LOOP LOOP LOOP LOOP 461 | void loop(void) { 462 | 463 | HTTP.handleClient(); // http server requests need handling... 464 | 465 | if ( AP_OR_STA == WIFI_AP ) { 466 | mdns.update(); 467 | //ESP.wdtFeed(); // prevent watchdog 468 | 469 | 470 | // FIRST THING WE DO IS LOOK FOR THE SPACING BETWEEN THE PPM FRAMES. ITS a HIGH voltage of around 4000us. so anything over 3000 is considered good. 471 | #define MINFRAMESPACEING 3000 472 | short risetime = read_pulse_len(false); 473 | if ( risetime > MINFRAMESPACEING ) { 474 | 475 | recentframes++; 476 | //Serial.println("sync pulse ok!"); 477 | //Serial.println(risetime); 478 | 479 | // sync pulse out at the start, for the oscilloscope to trigger on easily... 480 | digitalWrite(PPMOUTPIN, 0); 481 | digitalWrite(TRIGGERPIN, 1); 482 | delayMicroseconds(50); // a 1000us pulse is nice and easy for my scope to read at many scales, but messes with other things, as small as 50us works at some scales. 483 | digitalWrite(TRIGGERPIN, 0); 484 | delayMicroseconds(200); 485 | digitalWrite(PPMOUTPIN, 1); 486 | 487 | // once we've got the sync spacing, we read the next 8 pulse lengths.. 488 | // and IF there's any real difference from the previous one, we'll flag to 489 | // send the UDP packet later. 490 | #define DEJITTER 5 491 | for ( int p = 0 ; p < channel_count ; p++) { 492 | short pnew = read_pulse_len(true); 493 | if ( p == 0 && pnew > 6000 ) { pnew = read_pulse_len(true); } // if it's the first pulse, and we've read an overly LONG one, just drop it and try again. 494 | if ( pnew > 6000 ) { if ( channel_count > 8 ) channel_count--; break; } // shrink the channel count from 16 down to the actual channel count, if needed. 495 | if ( abs( pnew - pulselens[p] ) > DEJITTER ) { 496 | // flag to say there's changed data to send... 497 | udpnew++; 498 | pulselens[p] = pnew; 499 | //Serial.print(pulselens[p]); Serial.print("\t"); 500 | } 501 | } 502 | //Serial.println(); 503 | 504 | // after last pulse is read ( and copied to TRIGGERPIN ), delay here a bit to finish last pulse in frame. 505 | delayMicroseconds(400); // for debug only - so last/8th channel shows up on trace better. 506 | 507 | // in the event that the TX stick are unchanged, we'll continue to set at least ONE UDP packet per ~second 508 | if ( recentframes > 15 ) { // 15 is kinda good approx 2-3 heatbeats/sec .. in theory: 25 ~ 2Hz, 50 ~ 1hz 509 | udpnew++; 510 | recentframes = 0; 511 | } 512 | 513 | // comment out to stop UDP packets actually being sent: 514 | #define SEND_UDP 1 515 | 516 | // HINT simple way to decode 8 byte udp packets with this linux/osx command: 517 | // this first one does NOT work for broadcast packets: 518 | // nc -l -k -u 5554 | xxd 519 | // or: ( which works for broadcast packets ) 520 | // sudo tcpdump -n 'udp port 5554' 521 | #if SEND_UDP == 1 522 | if ( udpnew > 0 ) { 523 | // EITHER THIS: 524 | #if BROADCAST_UDP == 0 525 | // for each of the connected clients, send them a UDP packet 526 | for ( int cl = 0 ; cl < last_client_idx ; cl++ ) { 527 | Udp.beginPacket(clients[cl], navPort); 528 | for(int q = 0; q < channel_count ; q++) { 529 | Udp.write(pulselens[q]); 530 | // Serial.println(pulselens[q]); 531 | } 532 | Udp.endPacket(); 533 | } 534 | #endif 535 | // OR THIS: 536 | #if BROADCAST_UDP == 1 537 | //Serial.print("."); 538 | Udp.beginPacket(broadcast, navPort); 539 | for(int q = 0; q < channel_count ; q++) { 540 | if (pulselens[q] > 4000 ) { Serial.print("\nEEK EEK EEK EEK EEK EEk !!!!!!!!"); break; } 541 | // each of our readings is stored in a 'stort' ( two bytes), so we'll send them over the wire as two bytes, giving us 16bit res/channel in theory. 542 | char lb = (byte)(pulselens[q] >> 8); 543 | char hb = (byte)(pulselens[q]); 544 | Udp.write(lb); 545 | Udp.write(hb); 546 | Serial.print(pulselens[q]); Serial.print("\t"); 547 | } 548 | Udp.endPacket(); 549 | Serial.println(""); 550 | #endif 551 | 552 | udpnew = 0; 553 | } 554 | #endif 555 | 556 | //delay(10); this will 1/2 the number of ppm frames we see and action ( we'll do every second one ) 557 | } // the end of the PPMIN->UDP read loop! 558 | } 559 | 560 | // by enabling this, we are no longer reading EVERY PPM frame, only every second one, as we're WRITING this when we should be readin :-( 561 | if ( AP_OR_STA == WIFI_STA ) { 562 | 563 | 564 | // wait for UDP packet on port 5554, then break it open and use it. :-) 565 | //Udp.beginPacket(drone, navPort); 566 | //Udp.write(0x01); 567 | //Udp.endPacket(); 568 | if(Udp.parsePacket()) { 569 | int len = Udp.read(incoming, 1024); 570 | //Serial.print("packet len:"); 571 | //Serial.println(len); 572 | // TODO if len != 16 skip all this, as it's a dud packet. 573 | // 574 | incoming[len] = 0; 575 | for ( int b = 0 ; b < channel_count ; b ++ ) { 576 | byte t1 = incoming[b*2]; 577 | byte t2 = incoming[b*2+1]; 578 | short s = (short)(t1 << 8) | (short)t2; 579 | Serial.print("\t"); 580 | Serial.print(s); 581 | if (s > 4000 ) { Serial.print("\nEEK 4000 EEK EEK EEK EEK EEk !!!!!!!!"); break; } 582 | if (s < 400 ) { Serial.print("\nEEK 400 EEK EEK EEK EEK EEk !!!!!!!!"); channel_count--; break; } 583 | pulselens[b] = s; 584 | } 585 | 586 | Serial.println(); 587 | 588 | } 589 | // TODO is this calc OK? it's kinda ordinary to re-calc this constantly. 590 | static int frame_time_total = 20000; 591 | if (channel_count == 8 ) frame_time_total = 20000; 592 | if (channel_count > 8 && channel_count < 16 ) frame_time_total = 20000+((40000-20000)/8*(channel_count-8)); 593 | if (channel_count == 16 ) frame_time_total = 40000; 594 | 595 | //Serial.print("frame time:"); 596 | //Serial.println(frame_time_total); 597 | 598 | 599 | // if it's been at least 20ms(8ch) or 40ms(16ch) since we last send a PPM steam out ( the entire frame is 20ms ) 600 | if ( micros() - sta_runtime > frame_time_total) { 601 | sta_runtime = micros(); 602 | 603 | digitalWrite(TRIGGERPIN, 1); 604 | delayMicroseconds(50); // a 1000us pulse is nice and easy for my scope to read at many scales, but messes with other things, as small as 50us works at some scales. 605 | digitalWrite(TRIGGERPIN, 0); 606 | 607 | //start = 0; 608 | // write PPM pulses.. 609 | digitalWrite(PPMOUTPIN,HIGH); // first start with the line HIGH during the inter-frame 610 | delayMicroseconds(4000); // now do the inter-fram delay. it's got to be around 4000, but over 3000 611 | for(int q = 0; q < channel_count ; q++) { 612 | digitalWrite(PPMOUTPIN,LOW); 613 | delayMicroseconds(500); // some low fixed about 614 | digitalWrite(PPMOUTPIN,HIGH); 615 | delayMicroseconds(pulselens[q]); // delay the actual length of teh pulse, and we are done. 616 | } 617 | // and to finish the last pulse off: 618 | digitalWrite(PPMOUTPIN,LOW); 619 | delayMicroseconds(500); // some low fixed about 620 | digitalWrite(PPMOUTPIN,HIGH); 621 | } 622 | } 623 | 624 | } 625 | 626 | 627 | void print_binary(int v, int num_places) 628 | { 629 | int mask=0, n; 630 | 631 | for (n=1; n<=num_places; n++) 632 | { 633 | mask = (mask << 1) | 0x0001; 634 | } 635 | v = v & mask; // truncate v to specified number of places 636 | 637 | while(num_places) 638 | { 639 | 640 | if (v & (0x0001 << num_places-1)) 641 | { 642 | Serial.print("1"); 643 | } 644 | else 645 | { 646 | Serial.print("0"); 647 | } 648 | 649 | --num_places; 650 | if(((num_places%4) == 0) && (num_places != 0)) 651 | { 652 | Serial.print("_"); 653 | } 654 | } 655 | } 656 | 657 | void print_hex(int v, int num_places) 658 | { 659 | int mask=0, n, num_nibbles, digit; 660 | 661 | for (n=1; n<=num_places; n++) 662 | { 663 | mask = (mask << 1) | 0x0001; 664 | } 665 | v = v & mask; // truncate v to specified number of places 666 | 667 | num_nibbles = num_places / 4; 668 | if ((num_places % 4) != 0) 669 | { 670 | ++num_nibbles; 671 | } 672 | 673 | do 674 | { 675 | digit = ((v >> (num_nibbles-1) * 4)) & 0x0f; 676 | Serial.print(digit, HEX); 677 | } while(--num_nibbles); 678 | 679 | } 680 | 681 | /* BONUS, FOR THOSE THAT READ THE CODE! 682 | 683 | udp_reciever.py 684 | 685 | 686 | #!/usr/bin/env python 687 | # Make two ESP8266 wifi modules into a RC Transmitter and RC Reciever! 688 | # The below test/example python code is capable of receiving the UDP packets that the TX code generates, and printing the data to the console/screen. that's all. 689 | # You just need to put your laptop/whatever on the same access point as the TX ( its SSID is WIFI_TX by default in the code ). 690 | # (c) David "Buzz" Bussenschutt 20 Jan 2016 691 | import socket 692 | import binascii 693 | import struct 694 | 695 | port = 5554 696 | client_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) 697 | client_socket.bind(('',port)) # listen to all interfaces 698 | #client_socket.bind(('192.168.4.255',port)) # listen to broadcast only 699 | client_socket.setblocking(False) 700 | 701 | while ( 1 ): 702 | try: 703 | data,address = client_socket.recvfrom(10000) 704 | except socket.error: 705 | pass 706 | else: 707 | _len = len(data) 708 | #print "data recv :", data," len:",_len 709 | # 8 channels = 16 bytes, etc... 710 | if _len == 16: 711 | ( p1,p2,p3,p4,p5,p6,p7,p8) = struct.unpack(">HHHHHHHH",data) 712 | print str(p1) + "\t" + str(p2) + "\t" +str(p3) + "\t" +str(p4) + "\t" +str(p5) + "\t" +str(p6) + "\t" +str(p7) + "\t" +str(p8) 713 | if _len == 20: 714 | ( p1,p2,p3,p4,p5,p6,p7,p8,p9,p10) = struct.unpack(">HHHHHHHHHH",data) 715 | print str(p1) + "\t" + str(p2) + "\t" +str(p3) + "\t" +str(p4) + "\t" +str(p5) + "\t" +str(p6) + "\t" +str(p7) + "\t" +str(p8) + "\t" +str(p9) + "\t" +str(p10) 716 | if _len == 24: 717 | ( p1,p2,p3,p4,p5,p6,p7,p8,p9,p10,p11,p12) = struct.unpack(">HHHHHHHHHHHH",data) 718 | print str(p1) + "\t" + str(p2) + "\t" +str(p3) + "\t" +str(p4) + "\t" +str(p5) + "\t" +str(p6) + "\t" +str(p7) + "\t" +str(p8) + "\t" +str(p9) + "\t" +str(p10)+ "\t" +str(p11) + "\t" +str(p12) 719 | if _len == 28: 720 | ( p1,p2,p3,p4,p5,p6,p7,p8,p9,p10,p11,p12,p13,p14) = struct.unpack(">HHHHHHHHHHHHHH",data) 721 | print str(p1) + "\t" + str(p2) + "\t" +str(p3) + "\t" +str(p4) + "\t" +str(p5) + "\t" +str(p6) + "\t" +str(p7) + "\t" +str(p8) + "\t" +str(p9) + "\t" +str(p10)+ "\t" +str(p11) + "\t" +str(p12)+ "\t" +str(p13) + "\t" +str(p14) 722 | if _len == 32: 723 | ( p1,p2,p3,p4,p5,p6,p7,p8,p9,p10,p11,p12,p13,p14,p15,p16) = struct.unpack(">HHHHHHHHHHHHHHHH",data) 724 | print str(p1) + "\t" + str(p2) + "\t" +str(p3) + "\t" +str(p4) + "\t" +str(p5) + "\t" +str(p6) + "\t" +str(p7) + "\t" +str(p8) + "\t" +str(p9) + "\t" +str(p10)+ "\t" +str(p11) + "\t" +str(p12)+ "\t" +str(p13) + "\t" +str(p14)+ "\t" +str(p15) + "\t" +str(p16) 725 | 726 | 727 | 728 | 729 | */ 730 | 731 | -------------------------------------------------------------------------------- /web/esp8266-reflash.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/davidbuzz/esp8266_wifi_tx/24fc04584106d538d2b14936982a2d2355d013b9/web/esp8266-reflash.png -------------------------------------------------------------------------------- /web/esp8266.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/davidbuzz/esp8266_wifi_tx/24fc04584106d538d2b14936982a2d2355d013b9/web/esp8266.jpg -------------------------------------------------------------------------------- /web/s-l500.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/davidbuzz/esp8266_wifi_tx/24fc04584106d538d2b14936982a2d2355d013b9/web/s-l500.jpg -------------------------------------------------------------------------------- /web/youtube.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/davidbuzz/esp8266_wifi_tx/24fc04584106d538d2b14936982a2d2355d013b9/web/youtube.png --------------------------------------------------------------------------------