├── Arduino ├── myfunctions.h ├── settings.h └── weather.ino ├── README.md ├── Server ├── SQLTable.txt ├── canvasjs.js ├── chart.html ├── datafetch.php ├── espdata.php └── jquery-2.2.3.min.js └── schematic.jpg /Arduino/myfunctions.h: -------------------------------------------------------------------------------- 1 | 2 | String SensorData () { 3 | int i = 0; 4 | int j = 0; 5 | String textToSend =""; 6 | while ( i <= buffersize && j < maxsendsize) { 7 | if (timeBuffer[i] > 0) { 8 | if (textToSend != "") textToSend+= "&"; 9 | textToSend += "d[" + String(i) + "][ti]=" + timeBuffer[i] + "&d[" + String(i) + "][t]=" + tempBuffer[i] + "&d[" + String(i) + "][p]=" + pressureBuffer[i] + "&d[" + String(i) + "][h]=" + humidityBuffer[i] + "&d[" + String(i) + "][v]=" + voltageBuffer[i]; 10 | j++; 11 | timeBuffer[i] = 0; 12 | tempBuffer[i] = 0.0; 13 | pressureBuffer[i] = 0.0; 14 | humidityBuffer[i] = 0.0; 15 | voltageBuffer[i] = 0.0; 16 | Serial.println(i); 17 | } 18 | i++; 19 | } 20 | return textToSend; 21 | } 22 | 23 | int SendSensorData (String Sensordata) { 24 | // returns negative value if unsuccessful 25 | // returns a value from the php page if successful 26 | String returnvalue = "-1"; 27 | if (Sensordata != "" ) { 28 | HTTPClient http; 29 | http.begin(phppage); 30 | http.addHeader("Content-Type", contenttype); 31 | int httpCode = http.POST(Sensordata); 32 | if (httpCode != 200) { 33 | returnvalue = "-1"; 34 | Serial.println("not successful"); 35 | } else { 36 | returnvalue = http.getString(); 37 | Serial.println("successful:" + returnvalue); 38 | } 39 | http.end(); 40 | } 41 | int returnval = returnvalue.toInt(); 42 | return returnval; 43 | } 44 | 45 | 46 | /* not working yet 47 | void fpm_wakup_cb_func1(void) { 48 | wifi_fpm_close(); 49 | wifi_set_opmode(STATION_MODE); 50 | wifi_station_connect(); 51 | } 52 | */ 53 | 54 | 55 | 56 | 57 | /*-------- NTP code ----------*/ 58 | 59 | WiFiUDP Udp; 60 | time_t getNtpTime(); 61 | void sendNTPpacket(IPAddress &address); 62 | 63 | 64 | const int NTP_PACKET_SIZE = 48; // NTP time is in the first 48 bytes of message 65 | byte packetBuffer[NTP_PACKET_SIZE]; //buffer to hold incoming & outgoing packets 66 | 67 | time_t getNtpTime() 68 | { 69 | IPAddress ntpServerIP; // NTP server's ip address 70 | 71 | while (Udp.parsePacket() > 0) ; // discard any previously received packets 72 | Serial.println("Transmit NTP Request"); 73 | // get a random server from the pool 74 | WiFi.hostByName(ntpServerName, ntpServerIP); 75 | Serial.print(ntpServerName); 76 | Serial.print(": "); 77 | Serial.println(ntpServerIP); 78 | sendNTPpacket(ntpServerIP); 79 | uint32_t beginWait = millis(); 80 | while (millis() - beginWait < 1500) { 81 | int size = Udp.parsePacket(); 82 | if (size >= NTP_PACKET_SIZE) { 83 | Serial.println("Receive NTP Response"); 84 | Udp.read(packetBuffer, NTP_PACKET_SIZE); // read packet into the buffer 85 | unsigned long secsSince1900; 86 | // convert four bytes starting at location 40 to a long integer 87 | secsSince1900 = (unsigned long)packetBuffer[40] << 24; 88 | secsSince1900 |= (unsigned long)packetBuffer[41] << 16; 89 | secsSince1900 |= (unsigned long)packetBuffer[42] << 8; 90 | secsSince1900 |= (unsigned long)packetBuffer[43]; 91 | return secsSince1900 - 2208988800UL + timeZone * SECS_PER_HOUR; 92 | } 93 | } 94 | Serial.println("No NTP Response :-("); 95 | return 0; // return 0 if unable to get the time 96 | } 97 | 98 | // send an NTP request to the time server at the given address 99 | void sendNTPpacket(IPAddress &address) 100 | { 101 | // set all bytes in the buffer to 0 102 | memset(packetBuffer, 0, NTP_PACKET_SIZE); 103 | // Initialize values needed to form NTP request 104 | // (see URL above for details on the packets) 105 | packetBuffer[0] = 0b11100011; // LI, Version, Mode 106 | packetBuffer[1] = 0; // Stratum, or type of clock 107 | packetBuffer[2] = 6; // Polling Interval 108 | packetBuffer[3] = 0xEC; // Peer Clock Precision 109 | // 8 bytes of zero for Root Delay & Root Dispersion 110 | packetBuffer[12] = 49; 111 | packetBuffer[13] = 0x4E; 112 | packetBuffer[14] = 49; 113 | packetBuffer[15] = 52; 114 | // all NTP fields have been given values, now 115 | // you can send a packet requesting a timestamp: 116 | Udp.beginPacket(address, 123); //NTP requests are to port 123 117 | Udp.write(packetBuffer, NTP_PACKET_SIZE); 118 | Udp.endPacket(); 119 | } 120 | 121 | -------------------------------------------------------------------------------- /Arduino/settings.h: -------------------------------------------------------------------------------- 1 | // Network settings 2 | const char* ssid = "YOUR SSID"; 3 | const char* password = "YOUR PASSWORD"; 4 | const char* espname = "D1-Weather"; 5 | const char* phppage = "http://YOURSERVER.com/YOURFOLDER/espdata.php"; 6 | const char* contenttype = "application/x-www-form-urlencoded"; 7 | 8 | // Time settings 9 | static const char ntpServerName[] = "at.pool.ntp.org"; // use "us.pool.ntp.org" for the US, and other values for other countries analogously 10 | const int timeZone = 0; // Central European Time 1 , CEST 2, but should be handled by the JavaScript when the data is displayed in the browser 11 | unsigned int localPort = 8888; // local port to listen for UDP packets 12 | 13 | // Application settings 14 | const unsigned long sleepdelay = 60000; // Time between samples in milliseconds 15 | 16 | const float voltagemultiplier = 0.00496f; // Using a 200k resistor between the battery voltage and analog input A0 this experimentally results in the correct voltage being calculated in my setup, this might need to be changed for yours 17 | 18 | const int buffersize = 60*12; // 12 hours buffer when taking 1 sample per minute 19 | const int maxsendsize = 30; // Maximum number of datasets sent per POST request. If the request gets too large, stuff gets cut off, 30 is a safe value 20 | 21 | BME280 mySensor; // This can be tweaked, refer to https://github.com/finitespace/BME280 for details 22 | -------------------------------------------------------------------------------- /Arduino/weather.ino: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include 4 | #include // https://github.com/PaulStoffregen/Time 5 | #include 6 | #include 7 | #include // https://github.com/finitespace/BME280 8 | #include "Wire.h" 9 | 10 | extern "C" { 11 | #include "user_interface.h" // needed for light sleep (not really working yet) 12 | } 13 | 14 | #include "settings.h" 15 | 16 | // Loop & delay variables 17 | unsigned long loopstart = 0; 18 | unsigned long loopend = 0; 19 | long realdelay = 0; 20 | bool justrunonce = true; 21 | 22 | // Buffer 23 | time_t timeBuffer[buffersize] = {0}; 24 | float tempBuffer[buffersize] = {0.0}; 25 | float pressureBuffer[buffersize] = {0.0}; 26 | float humidityBuffer[buffersize] = {0.0}; 27 | float voltageBuffer[buffersize] = {0.0}; 28 | int bufferposition = 0; 29 | 30 | // Include functions after declaring other variables they might use 31 | #include "myfunctions.h" 32 | 33 | void setup() { 34 | Serial.begin(115200); 35 | wifi_set_sleep_type(LIGHT_SLEEP_T); // LIGHT_SLEEP_T for sleep, NONE_SLEEP_T FOR NO SLEEP 36 | WiFi.hostname(espname); 37 | WiFi.mode(WIFI_STA); 38 | while (WiFi.waitForConnectResult() != WL_CONNECTED) { 39 | WiFi.begin(ssid, password); 40 | delay(500); 41 | } 42 | 43 | wifi_fpm_set_sleep_type(LIGHT_SLEEP_T); 44 | 45 | // NTP setup 46 | Udp.begin(localPort); 47 | setSyncProvider(getNtpTime); 48 | setSyncInterval(1800); //update NTP every 30 mins (in seconds) 49 | 50 | // Sensor start 51 | mySensor.begin(); 52 | } 53 | 54 | 55 | void loop() { 56 | loopstart = millis(); 57 | if (justrunonce == true) { 58 | justrunonce = false; 59 | // Code that should just run once after start comes here 60 | // This is to avoid WDT issues in the setup 61 | delay(10); // sensor needs about 2ms to start up 62 | } 63 | 64 | // Read sensor data into the buffer 65 | if ( now() >= 100000000 ) { // Make sure we received the time via NTP, no use reading sensor data without proper timestamp 66 | for (int i = 0; i <= buffersize ; i++) { 67 | if ( timeBuffer[bufferposition] == 0 ) { 68 | break; // Exit the for-loop when we are at an empty buffer position 69 | } else { 70 | bufferposition = (bufferposition + 1) % buffersize; // Try the next position. Automagically rolls over if larger than the buffer 71 | } 72 | } 73 | timeBuffer[bufferposition] = now(); 74 | mySensor.ReadData(pressureBuffer[bufferposition], tempBuffer[bufferposition], humidityBuffer[bufferposition], true, 0); 75 | voltageBuffer[bufferposition] = analogRead(A0)*voltagemultiplier; 76 | } 77 | 78 | if(WiFi.status()== WL_CONNECTED) { 79 | if ( timeStatus() != timeSet || now() <= 100000000 ) { 80 | getNtpTime(); // Update NTP time when necessary 81 | } else { 82 | if ( SendSensorData("0") == 1 ) { // Test if we can connect to the php page and send data if we can 83 | delay(1000); 84 | SendSensorData(SensorData()); // sending up to 30 datasets at once (we can only send about 3000 characters in the POST request) 85 | } 86 | } 87 | 88 | } 89 | 90 | // Go to sleep for the specified time (minus the time we needed for all the stuff we did in the loop) 91 | loopend = millis(); 92 | realdelay = sleepdelay + loopstart - loopend; 93 | 94 | if ( realdelay > 0 && realdelay < sleepdelay ) { 95 | /* This doesn't work yet cause there is no wifi_fpm_set_wakeup_cb() yet... 96 | wifi_station_disconnect(); 97 | wifi_set_opmode(NULL_MODE); 98 | wifi_fpm_set_sleep_type(LIGHT_SLEEP_T); 99 | wifi_fpm_open(); 100 | wifi_fpm_set_wakeup_cb(fpm_wakup_cb_func1()); 101 | wifi_fpm_do_sleep(realdelay*1000); */ 102 | delay(realdelay); 103 | } else { 104 | delay(0); 105 | } 106 | } 107 | 108 | 109 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Wemos D1 Mini - BME280 Weather Station 2 | Simple Weather Station Code using an ESP8266 and a BME280 sensor. Data is handled via PHP and stored in a MySQL database. The code offers a buffer for when there is no internet connection available. 3 | 4 | #### Parts List: 5 | - 1x Wemos D1 Mini ESP8266 development board 6 | - 1x BME280 breakout board 7 | - 1x TP4056 charging board with battery protection 8 | - 2x Solar panels 5V 240mA (or one bigger one) 9 | - 1x Battery holder for 18650 batteries 10 | - 1x 18650 lithium ion battery 11 | - 2x Schottky diodes 12 | - 1x 200k Ohm resistor 13 | 14 | 15 | 16 | 17 | #### Schematic: 18 | ![](https://raw.githubusercontent.com/TheAustrian/Wemos-D1-Mini-BME280-Weather-Station/master/schematic.jpg) 19 | -------------------------------------------------------------------------------- /Server/SQLTable.txt: -------------------------------------------------------------------------------- 1 | Set up a MySQL table called 'weather' with the following fields: 2 | Name Type Increment 3 | ========================================= 4 | id bigint(20) AUTO_INCREMENT 5 | timestamp bigint(20) 6 | temperature float 7 | pressure float 8 | humidity float 9 | voltage float 10 | -------------------------------------------------------------------------------- /Server/chart.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 186 | 187 | 188 |
189 |
190 |
191 |
192 | 193 | 194 | 195 | -------------------------------------------------------------------------------- /Server/datafetch.php: -------------------------------------------------------------------------------- 1 | = ((SELECT MAX(timestamp) from weather) - 60*60*24*7*5) ORDER BY timestamp ASC"); 21 | 22 | while($row = mysqli_fetch_array($result)) 23 | { 24 | $point = array("x" => $row['timestamp']*1000 , "y1" => $row['temperature']-2, "y2" => $row['humidity'], "y3" => $row['pressure']/100.0, "y4" => $row['voltage'],); 25 | 26 | array_push($data_points, $point); 27 | } 28 | 29 | echo json_encode($data_points, JSON_NUMERIC_CHECK); 30 | } 31 | mysqli_close($conn); 32 | 33 | ?> 34 | -------------------------------------------------------------------------------- /Server/espdata.php: -------------------------------------------------------------------------------- 1 | 30 | -------------------------------------------------------------------------------- /Server/jquery-2.2.3.min.js: 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