├── pictures ├── clock.jpg └── stand.jpg ├── WTAClient.h ├── README.md ├── HollowClock.ino ├── WTAClient.cpp └── LICENSE /pictures/clock.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/xSnowHeadx/HollowClock/HEAD/pictures/clock.jpg -------------------------------------------------------------------------------- /pictures/stand.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/xSnowHeadx/HollowClock/HEAD/pictures/stand.jpg -------------------------------------------------------------------------------- /WTAClient.h: -------------------------------------------------------------------------------- 1 | #ifndef __WTA_CLIENT_H__ 2 | #define __WTA_CLIENT_H__ 3 | /* 4 | 5 | WTA Client 6 | 7 | Get the time from the worldtimeapi-server to prevent timezone and DST-mess 8 | Demonstrates use http-client and json-parser 9 | 10 | created 4 Sep 2010 11 | by Michael Margolis 12 | modified 9 Apr 2012 13 | by Tom Igoe 14 | updated for the ESP8266 12 Apr 2015 15 | by Ivan Grokhotkov 16 | Refactored into NTPClient class by Hari Wiguna, 2018 17 | changed from NTP to worldtimeapi by SnowHead, 2019 18 | 19 | This code is in the public domain. 20 | 21 | */ 22 | #include 23 | #include 24 | 25 | #define DEBUG 1 26 | 27 | class WTAClient { 28 | public: 29 | WTAClient(); 30 | void Setup(void); 31 | unsigned long GetCurrentTime(); 32 | byte GetHours(); 33 | byte GetMinutes(); 34 | byte GetSeconds(); 35 | void PrintTime(); 36 | bool SaveConfig(void); 37 | bool LoadConfig(void); 38 | 39 | private: 40 | void AskCurrentEpoch(); 41 | unsigned long ReadCurrentEpoch(); 42 | }; 43 | #endif // __WTA_CLIENT_H__ 44 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # HollowClock 2 | # An analog clock with flying hands controlled from internet-time via ESP8266 3 | https://github.com/xSnowHeadx/HollowClock 4 | 5 | README file 6 | SnowHead Mar 2021 7 | 8 | ![Clock](pictures/clock.jpg) 9 | ![Stand](pictures/stand.jpg) 10 | 11 | ## Introduction 12 | Shiura on [thingiverse](https://www.thingiverse.com/thing:4781365) designed a fascinating hollow clock.
13 | The original is controlled by an Arduino. The firmware here was adapted to an ESP8266 and for the use of the [WTA-timeservice](http://worldtimeapi.org) instead of NTP. So there normally are no firmware-modifications necessary to adapt the timezone and DST because they will be investigated out of the public IP of the request. For special cases (f.e. the use of a foreign proxy server) the timezone can be selected manually by replacing "ip" with the wished [timezone](http://worldtimeapi.org/timezone) in WTAClient.cpp.
14 |
15 | ##Used libraries:
16 | - ArduinoJson
17 | - DNSServer
18 | - DoubleResetDetector
19 | - ESP8266HTTPClient
20 | - ESP8266WebServer
21 | - ESP8266WiFi
22 | - WiFiManager
23 | 24 | Some modified mechanic parts are described [here](https://www.prusaprinters.org/prints/140533-hollow-clock-remix-uses-internet-time-with-esp8266)
25 | See informations to arduino-based version on [thingiverse](https://www.thingiverse.com/thing:4781365) 26 | -------------------------------------------------------------------------------- /HollowClock.ino: -------------------------------------------------------------------------------- 1 | // Hollow Clock improved by SnowHead, Mart 2021 2 | // 3 | // Thanks to: 4 | // shiura for stepper motor routines 5 | // SnowHead for Internet-Time 6 | 7 | #include "WTAClient.h" 8 | 9 | #define ROTATION_PERIOD_IN_SEC 1 10 | #define CREEPING_HANDS 0 // set to 1 for smooth hands movement (needs more current, motor becomes hotter) 11 | 12 | extern unsigned long askFrequency; 13 | 14 | // Motor and clock parameters 15 | #define STEPS_PER_ROTATION 4096L // steps of a single rotation of motor (motor: 64 steps/rotation, gear: 1/64) 16 | #define RATIO 5 // minutes per a rotation (minutes wheel: 120 teeth, motors pinion: 10 teeth) 17 | // wait for a single step of stepper 18 | #define HIGH_SPEED_DELAY 3 // minimal delay for highest speed, delay is calculated from steps and period 19 | unsigned int delaytime; 20 | 21 | //=== CLOCK === 22 | WTAClient wtaClient; 23 | unsigned long locEpoch = 0, netEpoch = 0, start_time; 24 | 25 | #define LED 16 26 | #define PHASES 8 27 | 28 | // ports used to control the stepper motor 29 | // if your motor rotate to the opposite direction, 30 | // change the order to {15, 13, 12, 14}; 31 | // ESP Stepper 32 | // D5 -> IN1 33 | // D6 -> IN2 34 | // D7 -> IN3 35 | // D8 -> IN4 36 | 37 | int port[4] = 38 | { 14, 12, 13, 15 }; 39 | 40 | int seq[PHASES][4] = 41 | #if (PHASES == 4) 42 | { 43 | { HIGH, LOW, HIGH, LOW }, 44 | { LOW, HIGH, HIGH, LOW }, 45 | { LOW, HIGH, LOW, HIGH }, 46 | { HIGH, LOW, LOW, HIGH }, 47 | #else 48 | // sequence of stepper motor control 49 | { 50 | { LOW, HIGH, HIGH, LOW }, 51 | { LOW, LOW, HIGH, LOW }, 52 | { LOW, LOW, HIGH, HIGH }, 53 | { LOW, LOW, LOW, HIGH }, 54 | { HIGH, LOW, LOW, HIGH }, 55 | { HIGH, LOW, LOW, LOW }, 56 | { HIGH, HIGH, LOW, LOW }, 57 | { LOW, HIGH, LOW, LOW }, 58 | #endif 59 | }; 60 | 61 | void rotate(int step) 62 | { 63 | static int phase = 0; 64 | int i, j; 65 | int delta = (step > 0) ? 1 : 7; 66 | #if DEBUG 67 | unsigned long ts = millis(); 68 | 69 | Serial.print("rotating steps: "); 70 | Serial.println(step); 71 | #endif 72 | 73 | step = (step > 0) ? step : -step; 74 | for (j = 0; j < step; j++) 75 | { 76 | phase = (phase + delta) % PHASES; 77 | for (i = 0; i < 4; i++) 78 | { 79 | digitalWrite(port[i], seq[phase][i]); 80 | } 81 | #if DEBUG 82 | digitalWrite(LED, j & 1); 83 | #endif 84 | #if CREEPING_HANDS 85 | delay(delaytime); 86 | #else 87 | delay(HIGH_SPEED_DELAY); 88 | #endif 89 | } 90 | // power cut 91 | 92 | for (i = 0; i < 4; i++) 93 | { 94 | digitalWrite(port[i], LOW); 95 | } 96 | 97 | #if DEBUG 98 | digitalWrite(LED, 1); 99 | Serial.print("needed milliseconds: "); 100 | Serial.println(millis()-ts); 101 | #endif 102 | #if ! CREEPING_HANDS 103 | if(digitalRead(0)) 104 | { 105 | delay(100); 106 | } 107 | #endif 108 | } 109 | 110 | long calc_step(int sec) 111 | { 112 | long steps; 113 | static double round_accu = 0.0; 114 | double fsteps = (double)STEPS_PER_ROTATION * sec / 60.0 / (double)RATIO; 115 | double tsteps; 116 | 117 | round_accu += modf(fsteps, &tsteps); 118 | steps = (long)tsteps; 119 | round_accu = modf(round_accu, &tsteps); 120 | steps += (long)tsteps; 121 | 122 | #if CREEPING_HANDS 123 | if(steps) 124 | { 125 | delaytime = ((ROTATION_PERIOD_IN_SEC * 1000L) - 250) / labs(steps); 126 | if(delaytime < HIGH_SPEED_DELAY) 127 | { 128 | delaytime = HIGH_SPEED_DELAY; 129 | } 130 | } 131 | #endif 132 | return steps; 133 | } 134 | 135 | void setup() 136 | { 137 | start_time = millis(); 138 | 139 | pinMode(port[0], OUTPUT); 140 | pinMode(port[1], OUTPUT); 141 | pinMode(port[2], OUTPUT); 142 | pinMode(port[3], OUTPUT); 143 | pinMode(0, INPUT_PULLUP); 144 | #if DEBUG 145 | pinMode(LED, OUTPUT); 146 | digitalWrite(LED, 1); 147 | #endif 148 | 149 | Serial.begin(115200); 150 | wtaClient.Setup(); 151 | askFrequency = 50; 152 | } 153 | 154 | void loop() 155 | { 156 | #if ! DEBUG 157 | if(!digitalRead(0)) 158 | { 159 | delaytime = HIGH_SPEED_DELAY; 160 | while(!digitalRead(0)) 161 | { 162 | rotate(1); 163 | Serial.println("teststep"); 164 | delay(200); 165 | } 166 | } 167 | #endif 168 | 169 | #if (ROTATION_PERIOD_IN_SEC == 1) 170 | while(((netEpoch = wtaClient.GetCurrentTime()) == locEpoch) || (!netEpoch)) 171 | #else 172 | while(((netEpoch = wtaClient.GetCurrentTime()) % ROTATION_PERIOD_IN_SEC) || (!netEpoch)) 173 | #endif 174 | { 175 | delay(100); 176 | } 177 | askFrequency = 60 * 60 * 1000; 178 | if(locEpoch) 179 | { 180 | wtaClient.PrintTime(); 181 | if(start_time) 182 | { 183 | delay(1000); 184 | locEpoch -= (millis() - start_time) / 1000; 185 | start_time = 0; 186 | } 187 | rotate(calc_step(netEpoch - locEpoch)); 188 | } 189 | else 190 | { 191 | delay(1000); 192 | } 193 | locEpoch = netEpoch; 194 | } 195 | -------------------------------------------------------------------------------- /WTAClient.cpp: -------------------------------------------------------------------------------- 1 | //=== WIFI MANAGER === 2 | #include 3 | #include 4 | #include 5 | #include //https://github.com/tzapu/WiFiManager 6 | #include 7 | #include 8 | #include "WiFiClient.h" 9 | 10 | char wifiManagerAPName[] = "HollowClockAP"; 11 | char wifiManagerAPPassword[] = ""; 12 | 13 | //== DOUBLE-RESET DETECTOR == 14 | #include 15 | #define DRD_TIMEOUT 10 // Second-reset must happen within 10 seconds of first reset to be considered a double-reset 16 | #define DRD_ADDRESS 0 // RTC Memory Address for the DoubleResetDetector to use 17 | DoubleResetDetector drd(DRD_TIMEOUT, DRD_ADDRESS); 18 | 19 | //=== WTA CLIENT === 20 | #include "WTAClient.h" 21 | #define WTAServerName "http://worldtimeapi.org/api/" 22 | HTTPClient http; 23 | WiFiClient wifiClient; 24 | String payload; 25 | bool military = true; 26 | 27 | unsigned long askFrequency = 60 * 60 * 1000; // How frequent should we get current time? in miliseconds. 60minutes = 60*60s = 60*60*1000ms 28 | unsigned long timeToAsk; 29 | unsigned long timeToRead; 30 | unsigned long lastEpoch; // We don't want to continually ask for epoch from time server, so this is the last epoch we received (could be up to an hour ago based on askFrequency) 31 | unsigned long lastEpochTimeStamp; // What was millis() when asked server for Epoch we are currently using? 32 | unsigned long nextEpochTimeStamp; // What was millis() when we asked server for the upcoming epoch 33 | unsigned long currentTime; 34 | 35 | //== PREFERENCES == (Fill these appropriately if you could not connect to the ESP via your phone) 36 | char homeWifiName[] = ""; // PREFERENCE: The name of the home WiFi access point that you normally connect to. 37 | char homeWifiPassword[] = ""; // PREFERENCE: The password to the home WiFi access point that you normally connect to. 38 | char timezone[] = "ip"; // PREFERENCE: TimeZone. Go to http://worldtimeapi.org/api/timezone to find your timezone string or chose "ip" to use IP-localisation for timezone detection 39 | bool error_getTime = false; 40 | 41 | WTAClient::WTAClient() 42 | { 43 | } 44 | 45 | void WTAClient::Setup(void) 46 | { 47 | //-- WiFiManager -- 48 | //Local intialization. Once its business is done, there is no need to keep it around 49 | WiFiManager wifiManager; 50 | //wifiManager.resetSettings(); // Uncomment this to reset saved WiFi credentials. Comment it back after you run once. 51 | //wifiManager.setBreakAfterConfig(true); // Get out of WiFiManager even if we fail to connect after config. So our Hail Mary pass could take care of it. 52 | //wifiManager.setSaveConfigCallback(saveConfigCallback); 53 | 54 | int connectionStatus = WL_IDLE_STATUS; 55 | 56 | if (strlen(homeWifiName) > 0) 57 | { 58 | Serial.println("USING IN SKETCH CREDENTIALS:"); 59 | Serial.println(homeWifiName); 60 | Serial.println(homeWifiPassword); 61 | connectionStatus = WiFi.begin(homeWifiName, homeWifiPassword); 62 | Serial.print("WiFi.begin returned "); 63 | Serial.println(connectionStatus); 64 | } 65 | else 66 | { 67 | 68 | //-- Double-Reset -- 69 | if (drd.detectDoubleReset()) 70 | { 71 | Serial.println("DOUBLE reset Detected"); 72 | digitalWrite(LED_BUILTIN, HIGH); 73 | //fetches ssid and pass from eeprom and tries to connect 74 | //if it does not connect it starts an access point with the specified name wifiManagerAPName 75 | //and goes into a blocking loop awaiting configuration 76 | connectionStatus = wifiManager.autoConnect(); //wifiManagerAPName, wifiManagerAPPassword); 77 | Serial.print("autoConnect returned "); 78 | Serial.println(connectionStatus); 79 | } 80 | else 81 | { 82 | Serial.println("SINGLE Reset Detected"); 83 | digitalWrite(LED_BUILTIN, LOW); 84 | WiFi.disconnect(); 85 | connectionStatus = wifiManager.startConfigPortal(wifiManagerAPName, wifiManagerAPPassword); 86 | Serial.print("startConfigPortal returned "); 87 | Serial.println(connectionStatus); 88 | } 89 | } 90 | 91 | while (WiFi.status() != WL_CONNECTED) 92 | { 93 | delay(500); 94 | Serial.print("."); 95 | } 96 | 97 | // Hail Mary pass. If WiFiManager fail to connect user to home wifi, connect manually :-( 98 | // if (WiFi.status() != WL_CONNECTED) { 99 | // Serial.println("Hail Mary!"); 100 | // 101 | // ETS_UART_INTR_DISABLE(); 102 | // wifi_station_disconnect(); 103 | // ETS_UART_INTR_ENABLE(); 104 | // 105 | // WiFi.begin(homeWifiName, homeWifiPassword); 106 | // Serial.println("Connected?"); 107 | // } 108 | 109 | //-- Status -- 110 | Serial.print("WiFi.status() = "); 111 | Serial.println(WiFi.status()); 112 | 113 | Serial.println("IP address: "); 114 | Serial.println(WiFi.localIP()); 115 | 116 | drd.stop(); 117 | delay(3000); 118 | } 119 | 120 | void WTAClient::AskCurrentEpoch() 121 | { 122 | char url[64] = WTAServerName; 123 | int httpCode; 124 | 125 | //if (DEBUG) Serial.println("AskCurrentEpoch called"); 126 | Serial.println("AskCurrentEpoch called"); 127 | 128 | strcat(url, timezone); 129 | http.begin(wifiClient, url); 130 | httpCode = http.GET(); 131 | 132 | payload = ""; 133 | if (httpCode > 0) 134 | { 135 | payload = http.getString(); 136 | } 137 | http.end(); 138 | } 139 | 140 | unsigned long WTAClient::ReadCurrentEpoch() 141 | { 142 | int cb = payload.length(); 143 | 144 | #if (DEBUG) 145 | Serial.println("ReadCurrentEpoch called"); 146 | #endif 147 | 148 | if (!cb) 149 | { 150 | error_getTime = false; 151 | #if (DEBUG) 152 | Serial.println("no packet yet"); 153 | #endif 154 | } 155 | else 156 | { 157 | const size_t capacity = JSON_OBJECT_SIZE(15) + 400; 158 | DynamicJsonDocument jsonDocument(capacity); 159 | 160 | error_getTime = true; 161 | Serial.print("time answer received, length="); 162 | Serial.println(cb); 163 | // We've received a time, read the data from it 164 | // the timedate are JSON values 165 | 166 | auto error = deserializeJson(jsonDocument, payload.c_str()); 167 | if (error) 168 | { 169 | Serial.println("parseObject() failed"); 170 | } 171 | else 172 | { 173 | // int week_number = jsonDocument["week_number"]; // 31 174 | // const char* utc_offset = jsonDocument["utc_offset"]; // "-04:00" 175 | // const char* utc_datetime = jsonDocument["utc_datetime"]; // "2019-08-01T16:58:40.68279+00:00" 176 | long unixtime = jsonDocument["unixtime"]; // 1564678720 177 | // const char* timezone = jsonDocument["timezone"]; // "America/New_York" 178 | int raw_offset = jsonDocument["raw_offset"]; // -18000 179 | // const char* dst_until = jsonDocument["dst_until"]; // "2019-11-03T06:00:00+00:00" 180 | int dst_offset = jsonDocument["dst_offset"]; // 3600 181 | // const char* dst_from = jsonDocument["dst_from"]; // "2019-03-10T07:00:00+00:00" 182 | // bool dst = jsonDocument["dst"]; // true 183 | // int day_of_year = jsonDocument["day_of_year"]; // 213 184 | // int day_of_week = jsonDocument["day_of_week"]; // 4 185 | // const char* datetime = jsonDocument["datetime"]; // "2019-08-01T12:58:40.682790-04:00" 186 | // const char* client_ip = jsonDocument["client_ip"]; // "23.235.227.109" 187 | // const char* abbreviation = jsonDocument["abbreviation"]; // "EDT" 188 | 189 | // now convert WTA time into everyday time: 190 | #if (DEBUG) 191 | Serial.print("Unix time = "); 192 | #endif 193 | lastEpoch = unixtime + raw_offset + dst_offset + 1; 194 | lastEpochTimeStamp = nextEpochTimeStamp; 195 | #if (DEBUG) 196 | Serial.println(lastEpoch); 197 | #endif 198 | } 199 | return lastEpoch; 200 | } 201 | return 0; 202 | } 203 | 204 | unsigned long WTAClient::GetCurrentTime() 205 | { 206 | //if (DEBUG) Serial.println("GetCurrentTime called"); 207 | unsigned long timeNow = millis(); 208 | if (timeNow > timeToAsk || !error_getTime) 209 | { // Is it time to ask server for current time? 210 | #if (DEBUG) 211 | Serial.println(" Time to ask"); 212 | #endif 213 | timeToAsk = timeNow + askFrequency; // Don't ask again for a while 214 | if (timeToRead == 0) 215 | { // If we have not asked... 216 | timeToRead = timeNow + 1000; // Wait one second for server to respond 217 | AskCurrentEpoch(); // Ask time server what is the current time? 218 | nextEpochTimeStamp = millis(); // next epoch we receive is for "now". 219 | } 220 | } 221 | 222 | if (timeToRead > 0 && timeNow > timeToRead) // Is it time to read the answer of our AskCurrentEpoch? 223 | { 224 | // Yes, it is time to read the answer. 225 | ReadCurrentEpoch(); // Read the server response 226 | timeToRead = 0; // We have read the response, so reset for next time we need to ask for time. 227 | } 228 | 229 | if (lastEpoch != 0) 230 | { // If we don't have lastEpoch yet, return zero so we won't try to display millis on the clock 231 | unsigned long elapsedMillis = millis() - lastEpochTimeStamp; 232 | currentTime = lastEpoch + (elapsedMillis / 1000); 233 | } 234 | 235 | #if (DEBUG) 236 | if (digitalRead(0) == LOW) 237 | currentTime -= 3600; 238 | #endif 239 | return currentTime; 240 | } 241 | 242 | byte WTAClient::GetHours() 243 | { 244 | int hours = (currentTime % 86400L) / 3600; 245 | 246 | // Convert to AM/PM if military time option is off 247 | if (!military) 248 | { 249 | if (hours == 0) 250 | hours = 12; // Midnight in military time is 0:mm, but we want midnight to be 12:mm 251 | if (hours > 12) 252 | hours -= 12; // After noon 13:mm should show as 01:mm, etc... 253 | } 254 | return hours; 255 | } 256 | 257 | byte WTAClient::GetMinutes() 258 | { 259 | return (currentTime % 3600) / 60; 260 | } 261 | 262 | byte WTAClient::GetSeconds() 263 | { 264 | return currentTime % 60; 265 | } 266 | 267 | void WTAClient::PrintTime() 268 | { 269 | #if (DEBUG) 270 | // print the hour, minute and second: 271 | Serial.print("The local time is: "); 272 | byte hh = GetHours(); 273 | byte mm = GetMinutes(); 274 | byte ss = GetSeconds(); 275 | 276 | Serial.print(hh); // print the hour (86400 equals secs per day) 277 | Serial.print(':'); 278 | if (mm < 10) 279 | { 280 | // In the first 10 minutes of each hour, we'll want a leading '0' 281 | Serial.print('0'); 282 | } 283 | Serial.print(mm); // print the minute (3600 equals secs per minute) 284 | Serial.print(':'); 285 | if (ss < 10) 286 | { 287 | // In the first 10 seconds of each minute, we'll want a leading '0' 288 | Serial.print('0'); 289 | } 290 | Serial.println(ss); // print the second 291 | #endif 292 | } 293 | -------------------------------------------------------------------------------- /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. 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You may not convey a covered 525 | work if you are a party to an arrangement with a third party that is 526 | in the business of distributing software, under which you make payment 527 | to the third party based on the extent of your activity of conveying 528 | the work, and under which the third party grants, to any of the 529 | parties who would receive the covered work from you, a discriminatory 530 | patent license (a) in connection with copies of the covered work 531 | conveyed by you (or copies made from those copies), or (b) primarily 532 | for and in connection with specific products or compilations that 533 | contain the covered work, unless you entered into that arrangement, 534 | or that patent license was granted, prior to 28 March 2007. 535 | 536 | Nothing in this License shall be construed as excluding or limiting 537 | any implied license or other defenses to infringement that may 538 | otherwise be available to you under applicable patent law. 539 | 540 | 12. No Surrender of Others' Freedom. 541 | 542 | If conditions are imposed on you (whether by court order, agreement or 543 | otherwise) that contradict the conditions of this License, they do not 544 | excuse you from the conditions of this License. If you cannot convey a 545 | covered work so as to satisfy simultaneously your obligations under this 546 | License and any other pertinent obligations, then as a consequence you may 547 | not convey it at all. For example, if you agree to terms that obligate you 548 | to collect a royalty for further conveying from those to whom you convey 549 | the Program, the only way you could satisfy both those terms and this 550 | License would be to refrain entirely from conveying the Program. 551 | 552 | 13. Use with the GNU Affero General Public License. 553 | 554 | Notwithstanding any other provision of this License, you have 555 | permission to link or combine any covered work with a work licensed 556 | under version 3 of the GNU Affero General Public License into a single 557 | combined work, and to convey the resulting work. The terms of this 558 | License will continue to apply to the part which is the covered work, 559 | but the special requirements of the GNU Affero General Public License, 560 | section 13, concerning interaction through a network will apply to the 561 | combination as such. 562 | 563 | 14. Revised Versions of this License. 564 | 565 | The Free Software Foundation may publish revised and/or new versions of 566 | the GNU General Public License from time to time. Such new versions will 567 | be similar in spirit to the present version, but may differ in detail to 568 | address new problems or concerns. 569 | 570 | Each version is given a distinguishing version number. If the 571 | Program specifies that a certain numbered version of the GNU General 572 | Public License "or any later version" applies to it, you have the 573 | option of following the terms and conditions either of that numbered 574 | version or of any later version published by the Free Software 575 | Foundation. If the Program does not specify a version number of the 576 | GNU General Public License, you may choose any version ever published 577 | by the Free Software Foundation. 578 | 579 | If the Program specifies that a proxy can decide which future 580 | versions of the GNU General Public License can be used, that proxy's 581 | public statement of acceptance of a version permanently authorizes you 582 | to choose that version for the Program. 583 | 584 | Later license versions may give you additional or different 585 | permissions. However, no additional obligations are imposed on any 586 | author or copyright holder as a result of your choosing to follow a 587 | later version. 588 | 589 | 15. Disclaimer of Warranty. 590 | 591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 599 | 600 | 16. Limitation of Liability. 601 | 602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 610 | SUCH DAMAGES. 611 | 612 | 17. Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. 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 | 635 | Copyright (C) 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 | Copyright (C) 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 | --------------------------------------------------------------------------------