├── LICENSE ├── README.md ├── Screen1.png ├── Screen2.png └── esp8266-fridge.ino /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 | 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 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # esp8266-fridge 2 | ESP8266-based simple fridge temperature controller with Web GUI 3 | 4 | This Arduino sketch for ESP8266 platform implements a simple temperature controller that drives fridge power on/off states based on temperature measured by DS18B20 digital thermometer readings and temperature/hysteresis parameters configured via a Web GUI. The controller can be configured to work as cooler and heater. 5 | It uses WifiManager to connect to Wifi networks so no hardcoded credentials are stored in the source code. 6 | 7 | Basic view: 8 | 9 | ![Basic view](https://github.com/eltomek/esp8266-fridge/blob/master/Screen1.png) 10 | 11 | ThingSpeak IoT platform is supported so you can plot temperature values like this: 12 | 13 | ![Data plot](https://github.com/eltomek/esp8266-fridge/blob/master/Screen2.png) 14 | 15 | ## Hardware used: 16 | 1. Wemos D1 mini board (or its clone) 17 | 1. Electromagnetic 10A relay board (one can use SSR instead) 18 | 1. DS180B20 digital thermometer 19 | 1. AC plug, socket, AC connection cables and some case 20 | 21 | ## Software prerequisites: 22 | All libraries are available through Arduino IDE Library Manager 23 | 1. ArduinoJson 24 | 1. DallasTemperature 25 | 1. OneWire 26 | 1. ThingSpeak 27 | 1. WifiManager 28 | 29 | ## Setup instructions: 30 | Wemos D1 mini example: 31 | * connect the Data/DQ line of our DS18B20 to the D4 (GPIO2) pin 32 | * connect the relay control pin to the D2 (GPIO4) pin (it can be described as IN) 33 | * connect the power supply and ground of the relay (5V) and DS18B20 (3.3V) 34 | * optionally, put a 4.7kOhm resistor between the Data/DQ line and the thermometer power supply 35 | 36 | ### Compiling software: 37 | Use the Arduino IDE (https://www.arduino.cc/en/main/software), add esp8266 support (https://github.com/esp8266/Arduino/blob/master/README.md#installing-with- boards-manager), install the necessary libraries (https://github.com/eltomek/esp8266-fridge#software-prerequisites) using the Library Manager in the Arduino IDE. 38 | 39 | If your esp8266 board's WiFi network has not previously been configured it will display it will enter the Access Point mode. Open the page at http://192.168.4.1 and configure the network connections (more info: https://github.com/tzapu/WiFiManager#how-it-works). 40 | 41 | ## Next steps 42 | * rework to use html templates to save RAM (potentially use this project https://github.com/winder/ESPTemplateProcessor) 43 | * add support for Fahrenheit units 44 | * add support for linear temperature control (e.g start at 17 degrees Celsius and finish at 21 after 5 days) - might be awkward with no RTC onboard 45 | * add support for Ubidots IoT platform (https://ubidots.com/) 46 | -------------------------------------------------------------------------------- /Screen1.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/eltomek/esp8266-fridge/f47c9502de72aacb77aaa3811667d1ebe57e80c4/Screen1.png -------------------------------------------------------------------------------- /Screen2.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/eltomek/esp8266-fridge/f47c9502de72aacb77aaa3811667d1ebe57e80c4/Screen2.png -------------------------------------------------------------------------------- /esp8266-fridge.ino: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include 4 | #include 5 | #include 6 | #include 7 | #include 8 | #include 9 | 10 | #define PIN_DS18B20 2 11 | #define PIN_RELAY 4 12 | 13 | #define HTTP_SERVER_PORT 80 14 | 15 | #define CONFIG_FILE "config.json" 16 | 17 | struct Config { 18 | uint8_t mode; 19 | float_t temperature; 20 | float_t hysteresis; 21 | uint8_t interval; 22 | uint32_t tsChannelId; 23 | String tsWriteApiKey; 24 | }; 25 | 26 | #define RANGE_TEMP_MIN 1.0 27 | #define RANGE_TEMP_MAX 25.0 28 | #define RANGE_HYST_MIN 0.1 29 | #define RANGE_HYST_MAX 2.0 30 | #define RANGE_INTERVAL_MIN 1 31 | #define RANGE_INTERVAL_MAX 60 32 | 33 | #define DEFAULT_MODE 2 34 | #define DEFAULT_TEMP 13.0 35 | #define DEFAULT_HYST 0.5 36 | #define DEFAULT_INTERVAL 1 37 | 38 | const std::vector Modes = {"OFF", "ON", "AUTO_COOL", "AUTO_HEAT"}; 39 | 40 | #define LOOP_PERIOD_MS 1000 // 1 sec 41 | 42 | uint32_t startMillis, currentMillis; 43 | uint16_t loopCnt = 0; 44 | 45 | void toggle(); 46 | void handleRoot(); 47 | void loadConfiguration(const String, Config &); 48 | void saveConfiguration(const String, const Config &); 49 | void printFile(const String); 50 | void handleRoot(); 51 | void handleConfig(); 52 | 53 | Config config; 54 | WiFiClient client; 55 | 56 | ESP8266WebServer server(HTTP_SERVER_PORT); 57 | 58 | OneWire oneWire(PIN_DS18B20); 59 | DallasTemperature sensors(&oneWire); 60 | 61 | const String htmlHeader = "\n" \ 62 | "\n" \ 63 | "\n" \ 64 | "\n" \ 65 | "\n" \ 66 | "esp8266-fridge\n" \ 67 | "\n" 68 | "\n"; 69 | 70 | const String htmlFooter = "\n"; 71 | 72 | void setup() { 73 | Serial.begin(115200); 74 | while (!Serial) continue; 75 | 76 | digitalWrite(PIN_DS18B20, LOW); 77 | pinMode(PIN_DS18B20, OUTPUT); 78 | 79 | digitalWrite(PIN_RELAY, LOW); 80 | pinMode(PIN_RELAY, OUTPUT); 81 | 82 | sensors.begin(); 83 | WiFiManager wifiManager; 84 | wifiManager.setConfigPortalTimeout(180); // try setting up WiFi but ignore and run fridge control regardless of connection status 85 | wifiManager.autoConnect(); 86 | 87 | ThingSpeak.begin(client); 88 | 89 | loadConfiguration(CONFIG_FILE, config); 90 | printFile(CONFIG_FILE); 91 | 92 | server.on("/", handleRoot); 93 | server.on("/config.html", handleConfig); 94 | server.begin(); 95 | 96 | Serial.printf("Web server started @ %s\n", WiFi.localIP().toString().c_str()); 97 | 98 | startMillis = millis(); 99 | 100 | ESP.wdtDisable(); 101 | } 102 | 103 | void loop() { 104 | currentMillis = millis(); 105 | server.handleClient(); 106 | 107 | if (currentMillis - startMillis >= LOOP_PERIOD_MS) { 108 | startMillis = currentMillis; 109 | 110 | if (!(loopCnt % (config.interval * 60))) { 111 | toggle(); 112 | } 113 | loopCnt++; 114 | ESP.wdtFeed(); 115 | } 116 | } 117 | 118 | void loadConfiguration(const String filename, Config &config) { 119 | Serial.println(F("Loading configuration...")); 120 | 121 | while (!SPIFFS.begin()) { 122 | delay(1000); 123 | } 124 | 125 | File file = SPIFFS.open(filename, "r"); 126 | 127 | StaticJsonDocument<256> doc; 128 | 129 | DeserializationError error = deserializeJson(doc, file); 130 | 131 | if (error) 132 | Serial.println(F("Failed to read config file")); 133 | 134 | config.mode = doc["mode"] | DEFAULT_MODE; 135 | config.temperature = doc["temperature"] | DEFAULT_TEMP; 136 | config.hysteresis = doc["hysteresis"] | DEFAULT_HYST; 137 | config.interval = doc["interval"] | DEFAULT_INTERVAL; 138 | config.tsChannelId = doc["tsChannelId"] | 0; 139 | config.tsWriteApiKey = doc["tsWriteApiKey"] | ""; 140 | 141 | file.close(); 142 | SPIFFS.end(); 143 | } 144 | 145 | void saveConfiguration(const String filename, const Config &config) { 146 | Serial.println(F("Saving configuration...")); 147 | while (!SPIFFS.begin()) delay(1000); 148 | 149 | SPIFFS.remove(filename); // Delete existing file, otherwise the configuration is appended to the file 150 | 151 | // Open file for writing 152 | File file = SPIFFS.open(filename, "w"); 153 | if (!file) { 154 | Serial.println(F("Failed to create file")); 155 | return; 156 | } 157 | 158 | StaticJsonDocument<256> doc; 159 | 160 | // Set the values in the document 161 | doc["mode"] = config.mode; 162 | doc["temperature"] = config.temperature; 163 | doc["hysteresis"] = config.hysteresis; 164 | doc["interval"] = config.interval; 165 | doc["tsChannelId"] = config.tsChannelId; 166 | doc["tsWriteApiKey"] = config.tsWriteApiKey; 167 | 168 | if (serializeJson(doc, file) == 0) { 169 | Serial.println(F("Failed to write to file")); 170 | } 171 | 172 | file.close(); 173 | 174 | SPIFFS.end(); 175 | } 176 | 177 | void printFile(const String filename) { 178 | while (!SPIFFS.begin()) delay(1000); 179 | 180 | // Open file for reading 181 | File file = SPIFFS.open(filename, "r"); 182 | if (!file) { 183 | Serial.println(F("Failed to read file")); 184 | return; 185 | } 186 | 187 | // Extract each characters by one by one 188 | while (file.available()) { 189 | Serial.print((char)file.read()); 190 | } 191 | Serial.println(); 192 | 193 | // Close the file 194 | file.close(); 195 | SPIFFS.end(); 196 | } 197 | 198 | void handleRoot() { 199 | String html; 200 | html = htmlHeader; 201 | html += "\n"; 202 | 203 | boolean configUpdate = false; 204 | std::vector statusUpdate; 205 | String statusThingspeak, statusHtml; 206 | 207 | for (uint8_t i = 0; i < server.args(); i++) { 208 | 209 | if (String(server.argName(i)) == "mode") { 210 | uint8_t reqMode = server.arg(i).toInt(); 211 | 212 | if (reqMode < Modes.size() && reqMode != config.mode) { 213 | config.mode = server.arg(i).toInt(); 214 | statusUpdate.push_back("Mode: " + String(config.mode)); 215 | configUpdate = true; 216 | } 217 | } 218 | 219 | if (String(server.argName(i)) == "temp") { 220 | float_t reqTemp = server.arg(i).toFloat(); 221 | 222 | if (reqTemp >= RANGE_TEMP_MIN && reqTemp <= RANGE_TEMP_MAX && reqTemp != config.temperature) { 223 | config.temperature = reqTemp; 224 | statusUpdate.push_back("Temp: " + String(config.temperature)); 225 | configUpdate = true; 226 | } 227 | } 228 | 229 | if (String(server.argName(i)) == "hyst") { 230 | float_t reqHysteresis = server.arg(i).toFloat(); 231 | 232 | if (reqHysteresis >= RANGE_HYST_MIN && reqHysteresis <= RANGE_HYST_MAX && reqHysteresis != config.hysteresis) { 233 | config.hysteresis = reqHysteresis; 234 | statusUpdate.push_back("Hysteresis: " + String(config.hysteresis)); 235 | configUpdate = true; 236 | } 237 | } 238 | 239 | if (String(server.argName(i)) == "interval") { 240 | uint8_t reqInterval = server.arg(i).toInt(); 241 | 242 | if (reqInterval >= RANGE_INTERVAL_MIN && reqInterval <= RANGE_INTERVAL_MAX && reqInterval != config.interval) { 243 | config.interval = reqInterval; 244 | statusUpdate.push_back("Interval: " + String(config.interval)); 245 | configUpdate = true; 246 | } 247 | } 248 | 249 | if (String(server.argName(i)) == "tsChannelId") { 250 | uint32_t reqTsChannelId = server.arg(i).toInt(); 251 | 252 | if (reqTsChannelId > 0 && reqTsChannelId != config.tsChannelId) { 253 | config.tsChannelId = reqTsChannelId; 254 | statusUpdate.push_back("ThingSpeak Channel ID: " + String(config.tsChannelId)); 255 | configUpdate = true; 256 | } 257 | } 258 | 259 | if (String(server.argName(i)) == "tsWriteApiKey") { 260 | String reqTsWriteApiKey = server.arg(i); 261 | 262 | if (reqTsWriteApiKey.length() > 0 && reqTsWriteApiKey != config.tsWriteApiKey) { 263 | config.tsWriteApiKey = reqTsWriteApiKey; 264 | statusUpdate.push_back("ThingSpeak Write API Key: ***"); 265 | configUpdate = true; 266 | } 267 | } 268 | } 269 | 270 | if (configUpdate) { 271 | saveConfiguration(CONFIG_FILE, config); 272 | 273 | for (size_t i = 0; i < statusUpdate.size(); i++) { 274 | statusThingspeak += statusUpdate.at(i) + " "; 275 | statusHtml += "

" + statusUpdate.at(i) + "

\n"; 276 | } 277 | 278 | ThingSpeak.setStatus(statusThingspeak); 279 | printFile(CONFIG_FILE); 280 | toggle(); 281 | } 282 | 283 | sensors.requestTemperatures(); // Send the command to get temperatures 284 | html += statusHtml; 285 | html += "
\n"; 286 | for (std::size_t i = 0; i < Modes.size(); i++) { 287 | html += " \n"; 288 | } 289 | html += "
Temperature: \n"; 290 | html += "°C (" + String(RANGE_TEMP_MIN) + " - " + String(RANGE_TEMP_MAX) + "°C)
\n"; 291 | html += "Hysteresis: °C (" + String(RANGE_HYST_MIN) + " - " + String(RANGE_HYST_MAX) + "°C)
\n"; 292 | html += "Interval: min (" + String(RANGE_INTERVAL_MIN) + " - " + String(RANGE_INTERVAL_MAX) + " min)
\n"; 293 | html += "
\n"; 294 | html += "

Current temp: " + String(sensors.getTempCByIndex(0)) + "°C

\n"; 295 | String pinState = digitalRead(PIN_RELAY) > 0 ? "ON" : "OFF"; 296 | html += "

Cooler/heater state: " + pinState + "

\n"; 297 | html += "

config »

\n"; 298 | html += "\n"; 299 | html += htmlFooter; 300 | 301 | server.send(200, "text/html", html); 302 | } 303 | 304 | void handleConfig() { 305 | String html; 306 | html = htmlHeader; 307 | html += "\n"; 308 | html += "
\n"; 309 | html += "

ThingSpeak settings

"; 310 | html += "Channel ID:
\n"; 311 | html += "Write API Key:
\n"; 312 | html += "
\n"; 313 | html += "\n"; 314 | html += "

« back

\n"; 315 | html += "\n"; 316 | html += htmlFooter; 317 | 318 | server.send(200, "text/html", html); 319 | } 320 | 321 | void toggle() { 322 | sensors.requestTemperatures(); 323 | float_t currentTemp = sensors.getTempCByIndex(0); 324 | 325 | Serial.println(currentTemp); 326 | 327 | switch (config.mode) 328 | { 329 | case 0: // permanent off 330 | digitalWrite(PIN_RELAY, LOW); 331 | break; 332 | 333 | case 1: // permanent on 334 | digitalWrite(PIN_RELAY, HIGH); 335 | break; 336 | 337 | case 2: // cooling 338 | if (currentTemp - config.hysteresis / 2 >= config.temperature) { 339 | digitalWrite(PIN_RELAY, HIGH); 340 | } 341 | else if (currentTemp + config.hysteresis / 2 <= config.temperature) { 342 | digitalWrite(PIN_RELAY, LOW); 343 | } 344 | break; 345 | 346 | case 3: // heating 347 | if (currentTemp - config.hysteresis / 2 >= config.temperature) { 348 | digitalWrite(PIN_RELAY, LOW); 349 | } 350 | else if (currentTemp + config.hysteresis / 2 <= config.temperature) { 351 | digitalWrite(PIN_RELAY, HIGH); 352 | } 353 | break; 354 | } 355 | 356 | if (WiFi.status() == WL_CONNECTED) { 357 | ThingSpeak.setField(1, currentTemp); 358 | ThingSpeak.setField(2, digitalRead(PIN_RELAY)); 359 | uint16_t tsRes = ThingSpeak.writeFields(config.tsChannelId, config.tsWriteApiKey.c_str()); 360 | 361 | if (tsRes == 200) { 362 | Serial.println(F("Channel update successful")); 363 | } 364 | else { 365 | Serial.println("Problem updating channel. HTTP error code " + String(tsRes)); 366 | } 367 | } 368 | } --------------------------------------------------------------------------------