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4 | * you may not use this file except in compliance with the License. 5 | * You may obtain a copy of the License at 6 | * 7 | * http://www.apache.org/licenses/LICENSE-2.0 8 | * 9 | * Unless required by applicable law or agreed to in writing, software 10 | * distributed under the License is distributed on an "AS IS" BASIS, 11 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 | * See the License for the specific language governing permissions and 13 | * limitations under the License. 14 | * 15 | * Author: Neto Marin 16 | * E-mail: netomarin@gmail.com 17 | */ 18 | #include 19 | #include 20 | #include 21 | #include 22 | #include 23 | 24 | // ID of the settings block 25 | #define CONFIG_VERSION "ls1" 26 | // Tell it where to store your config data in EEPROM 27 | #define CONFIG_START 32 28 | 29 | //Setup configuration 30 | struct StoreStruct { 31 | float fermentationTemp; 32 | float tempDelta; 33 | char tempUnit; 34 | long startedWhen; 35 | char version_of_program[4]; 36 | } settings = { 37 | // The default values 38 | 19.0, 39 | 0.5, 40 | 'C', 41 | 0, 42 | CONFIG_VERSION 43 | }; 44 | 45 | /** 46 | * Variable to control stage/flow 47 | * 0 - Reading temperature 48 | * 1 - Default value loaded message 49 | * 2 - Configuration screen 50 | */ 51 | int stage = 0; 52 | bool waitingCommand = false; 53 | long pressedSince; 54 | int stateButton; 55 | long waiting; 56 | 57 | //Aux variables 58 | float tempAux; 59 | 60 | //LCD message state 61 | bool invalidateLCD; 62 | 63 | //indicator leds configuration 64 | int blueLed = 8; 65 | int redLed = 9; 66 | 67 | //Push buttons 68 | int setButton = 2; 69 | int upButton = 3; 70 | int downButton = 4; 71 | 72 | //Temperature sensor configuration 73 | int SensorPin = 12; 74 | static char outstr[4]; 75 | OneWire ds(SensorPin); 76 | 77 | //relay 1 connected to port A0 78 | int relay1 = 14; 79 | //relay 2 connected to port A1 80 | int relay2 = 15; 81 | 82 | //LCD setup 83 | #define I2C_ADDR 0x27 84 | #define BACKLIGHT_PIN 3 85 | #define En_pin 2 86 | #define Rw_pin 1 87 | #define Rs_pin 0 88 | #define D4_pin 4 89 | #define D5_pin 5 90 | #define D6_pin 6 91 | #define D7_pin 7 92 | 93 | LiquidCrystal_I2C lcd(I2C_ADDR, En_pin, Rw_pin, Rs_pin, 94 | D4_pin, D5_pin, D6_pin, D7_pin); 95 | 96 | //Operational variables 97 | float fermentationTemp; 98 | float tempVariation; 99 | 100 | void setup(void) { 101 | Serial.begin(9600); 102 | 103 | //Indicator leds outputs 104 | pinMode(blueLed, OUTPUT); 105 | pinMode(redLed, OUTPUT); 106 | 107 | //push buttons 108 | pinMode(setButton, INPUT); 109 | pinMode(upButton, INPUT); 110 | pinMode(downButton, INPUT); 111 | 112 | //Defining relay outputs 113 | pinMode(relay1, OUTPUT); 114 | pinMode(relay2, OUTPUT); 115 | 116 | //configuring temperature parameters 117 | loadConfig(); 118 | 119 | //Starting LCD 120 | lcd.begin (20, 4); 121 | lcd.setBacklightPin(BACKLIGHT_PIN, POSITIVE); 122 | lcd.setBacklight(HIGH); 123 | invalidateLCD = true; //first time, invalidating to be drawn 124 | } 125 | 126 | void loop(void) { 127 | 128 | if (!waitingCommand) { 129 | /* 130 | * Application's flow control 131 | */ 132 | switch (stage) { 133 | case 0: 134 | readingTemperature(); 135 | break; 136 | case 1: 137 | confirmDefaultValuesLoaded(); 138 | break; 139 | case 2: 140 | startConfigurationWizard(); 141 | break; 142 | case 3: 143 | configureMaxDelta(); 144 | break; 145 | } 146 | } else { 147 | /** 148 | * Command's control 149 | */ 150 | 151 | /** 152 | * SET button 153 | */ 154 | if (digitalRead(setButton) == HIGH) { 155 | waitingCommand = false; 156 | if (stage == 1) { 157 | stage = 0; 158 | } else if (stage == 2) { 159 | settings.fermentationTemp = tempAux; 160 | saveConfig(); 161 | stage = 3; 162 | } else if (stage == 3) { 163 | settings.tempDelta = tempAux; 164 | saveConfig(); 165 | stage = 0; 166 | invalidateLCD = true; 167 | } 168 | } 169 | 170 | /** 171 | * UP button 172 | */ 173 | if (digitalRead(upButton) == HIGH) { 174 | if (stage == 2 || stage == 3) { 175 | tempAux = (tempAux + 0.1); 176 | 177 | //checking if new value and reseting if it's too high 178 | if (stage == 2 && tempAux >= 40.1) { 179 | tempAux = -5.0; 180 | } else if (stage == 3 && tempAux >= 5.1) { 181 | tempAux = 5.0; 182 | } 183 | //updating LCD 184 | updateTempConfiguration(); 185 | } 186 | } 187 | 188 | /** 189 | * DOWN button 190 | */ 191 | if (digitalRead(downButton) == HIGH) { 192 | if (stage == 2 || stage == 3) { 193 | tempAux = (tempAux - 0.1); 194 | 195 | //checking if new value and reseting if it's too low 196 | if (stage == 2 && tempAux <= -5.1) { 197 | tempAux = 40.0; 198 | } else if (stage == 3 && tempAux <= 0.1) { 199 | tempAux = 0.2; 200 | } 201 | //updating LCD 202 | updateTempConfiguration(); 203 | } 204 | } 205 | 206 | /* 207 | * return to stage 0 (read and show temperature) after 5 seconds of idle 208 | */ 209 | if (stage > 1 && (millis() - waiting) >= 5000) { 210 | stage = 0; 211 | invalidateLCD = true; 212 | waitingCommand = false; 213 | } 214 | } 215 | 216 | //Detecting hold on set button 217 | stateButton = digitalRead(setButton); 218 | if ( stateButton == HIGH) { 219 | if (pressedSince == 0) { 220 | //started holding 221 | pressedSince = millis(); 222 | } else { 223 | //set button pressed during 3 seconds 224 | if ((millis() - pressedSince) >= 3000) { 225 | stage = 2; 226 | } 227 | } 228 | } else if (pressedSince > 0) { 229 | //reseting after release the button 230 | pressedSince = 0; 231 | } 232 | 233 | //Hidden command to reset configuration 234 | if (digitalRead(setButton) == HIGH && digitalRead(upButton) == HIGH && digitalRead(downButton) == HIGH) { 235 | resetEEPROM(); 236 | } 237 | } 238 | 239 | /******************************************************************************************************* 240 | * Stage 0: Reading and showing information about temperatures 241 | *******************************************************************************************************/ 242 | void readingTemperature() { 243 | if (invalidateLCD) { 244 | invalidateLCD = false; 245 | // Starting and configuring LCD 246 | lcd.clear(); 247 | lcd.home(); 248 | lcd.print("Temperatura:"); 249 | lcd.setCursor(0, 1); 250 | lcd.print("Temp. ideal: "); 251 | dtostrf(settings.fermentationTemp, 4, 1, outstr); 252 | lcd.setCursor(14, 1); 253 | lcd.print(outstr); 254 | lcd.print((char)223); 255 | lcd.print("C"); 256 | lcd.setCursor(0, 2); 257 | lcd.print("Delta max.: "); 258 | dtostrf(settings.tempDelta, 4, 1, outstr); 259 | lcd.setCursor(14, 2); 260 | lcd.print(outstr); 261 | lcd.print((char)223); 262 | lcd.print("C"); 263 | lcd.setCursor(0, 3); 264 | lcd.print("SmartHomebrew@GitHub"); 265 | } 266 | 267 | float temp = getTemp(); 268 | lcd.setCursor(14, 0); 269 | dtostrf(temp, 4, 1, outstr); 270 | lcd.print(outstr); 271 | lcd.print((char)223); 272 | lcd.print("C"); 273 | 274 | if (temp >= (settings.fermentationTemp + settings.tempDelta)) { 275 | //Temperature is higher than desired, let's cool down! 276 | //turn on relay 1 - turn off relay 2 - turn on blue led 277 | digitalWrite(relay1, LOW); 278 | digitalWrite(relay2, HIGH); 279 | digitalWrite(blueLed, HIGH); 280 | digitalWrite(redLed, LOW); 281 | } else if (temp <= (settings.fermentationTemp - settings.tempDelta)) { 282 | //Temperature is lower than desired, let's warm up! 283 | //turn on relay 2 - turn off relay 1 - turn on red led 284 | digitalWrite(relay1, HIGH); 285 | digitalWrite(relay2, LOW); 286 | digitalWrite(blueLed, LOW); 287 | digitalWrite(redLed, HIGH); 288 | } 289 | } 290 | 291 | /******************************************************************************************************* 292 | * Stage 1: Warning user about default values 293 | * It could be dangerous to the fermentation proccess. 294 | *******************************************************************************************************/ 295 | void confirmDefaultValuesLoaded() { 296 | lcd.clear(); 297 | lcd.print("***** ATENCAO! *****"); 298 | lcd.setCursor(0, 1); 299 | lcd.print(" Inicializado com"); 300 | lcd.setCursor(0, 2); 301 | lcd.print(" valores padrao !"); 302 | lcd.setCursor(0, 3); 303 | lcd.print(" Press. set p/ sair"); 304 | waitingCommand = true; 305 | } 306 | 307 | /******************************************************************************************************* 308 | * Stage 2: Configuring temperature to control. 309 | *******************************************************************************************************/ 310 | void startConfigurationWizard() { 311 | lcd.clear(); 312 | lcd.print("*** Configuracao ***"); 313 | lcd.setCursor(0, 1); 314 | lcd.print("Temperatura: "); 315 | dtostrf(settings.fermentationTemp, 4, 1, outstr); 316 | lcd.setCursor(14, 1); 317 | lcd.print(outstr); 318 | lcd.print((char)223); 319 | lcd.print("C"); 320 | lcd.setCursor(0, 2); 321 | lcd.print(" + e - para ajustar"); 322 | lcd.setCursor(0, 3); 323 | lcd.print(" Set para continuar"); 324 | tempAux = settings.fermentationTemp; 325 | pressedSince = 0; 326 | waitingCommand = true; 327 | delay(500); 328 | waiting = millis(); 329 | } 330 | 331 | /******************************************************************************************************* 332 | * Stage 3: Configuring temperature delta 333 | *******************************************************************************************************/ 334 | void configureMaxDelta() { 335 | lcd.clear(); 336 | lcd.print("*** Configuracao ***"); 337 | lcd.setCursor(0, 1); 338 | lcd.print("Delta Max.: "); 339 | dtostrf(settings.tempDelta, 4, 1, outstr); 340 | lcd.setCursor(14, 1); 341 | lcd.print(outstr); 342 | lcd.print((char)223); 343 | lcd.print("C"); 344 | lcd.setCursor(0, 2); 345 | lcd.print(" + e - para ajustar"); 346 | lcd.setCursor(0, 3); 347 | lcd.print(" Set para finalizar"); 348 | tempAux = settings.tempDelta; 349 | pressedSince = 0; 350 | waitingCommand = true; 351 | delay(200); 352 | waiting = millis(); 353 | } 354 | 355 | /******************************************************************************************************* 356 | * Updating LCD with new value after pressing 357 | * up or down buttons 358 | *******************************************************************************************************/ 359 | void updateTempConfiguration() { 360 | dtostrf(tempAux, 4, 1, outstr); 361 | lcd.setCursor(14, 1); 362 | lcd.print(outstr); 363 | lcd.print((char)223); 364 | lcd.print("C"); 365 | delay(200); 366 | waiting = millis(); 367 | } 368 | 369 | /******************************************************************************************************* 370 | * Loading configuration data from EEPROM 371 | *******************************************************************************************************/ 372 | void loadConfig() { 373 | // To make sure there are settings, and they are YOURS! 374 | // If nothing is found it will use the default settings. 375 | if (//EEPROM.read(CONFIG_START + sizeof(settings) - 1) == settings.version_of_program[3] // this is '\0' 376 | EEPROM.read(CONFIG_START + sizeof(settings) - 2) == settings.version_of_program[2] && 377 | EEPROM.read(CONFIG_START + sizeof(settings) - 3) == settings.version_of_program[1] && 378 | EEPROM.read(CONFIG_START + sizeof(settings) - 4) == settings.version_of_program[0]) 379 | { // reads settings from EEPROM 380 | Serial.println("Lendo da EEPROM"); 381 | for (unsigned int t = 0; t < sizeof(settings); t++) 382 | *((char*)&settings + t) = EEPROM.read(CONFIG_START + t); 383 | } else { 384 | Serial.println("Carregando default"); 385 | // settings aren't valid! will overwrite with default settings 386 | saveConfig(); 387 | stage = 1; 388 | } 389 | } 390 | 391 | /******************************************************************************************************* 392 | * Saving configuration data to EEPROM 393 | *******************************************************************************************************/ 394 | void saveConfig() { 395 | Serial.println("Salvando dados"); 396 | for (unsigned int t = 0; t < sizeof(settings); t++) 397 | { // writes to EEPROM 398 | EEPROM.write(CONFIG_START + t, *((char*)&settings + t)); 399 | // and verifies the data 400 | if (EEPROM.read(CONFIG_START + t) != *((char*)&settings + t)) 401 | { 402 | // error writing to EEPROM 403 | Serial.println("Erro ao salvar EEPROM"); 404 | } 405 | } 406 | } 407 | 408 | /******************************************************************************************************* 409 | * Clear EEPROM, writing 0 into all bytes 410 | *******************************************************************************************************/ 411 | void resetEEPROM() { 412 | for (int i = 0 ; i < EEPROM.length() ; i++) { 413 | EEPROM.write(i, 0); 414 | } 415 | digitalWrite(blueLed, HIGH); 416 | digitalWrite(redLed, HIGH); 417 | delay(500); 418 | digitalWrite(blueLed, LOW); 419 | digitalWrite(redLed, LOW); 420 | } 421 | 422 | /******************************************************************************************************* 423 | * Reading temperature from the sensor 424 | *******************************************************************************************************/ 425 | float getTemp() { 426 | 427 | byte data[12]; 428 | byte addr[8]; 429 | if ( !ds.search(addr)) { 430 | //no more sensors on chain, reset search 431 | ds.reset_search(); 432 | return -1000; 433 | } 434 | if ( OneWire::crc8( addr, 7) != addr[7]) { 435 | Serial.println("CRC is not valid!"); 436 | return -1000; 437 | } 438 | if ( addr[0] != 0x10 && addr[0] != 0x28) { 439 | Serial.print("Device is not recognized"); 440 | return -1000; 441 | } 442 | ds.reset(); 443 | ds.select(addr); 444 | ds.write(0x44, 1); 445 | byte present = ds.reset(); 446 | ds.select(addr); 447 | ds.write(0xBE); 448 | 449 | for (int i = 0; i < 9; i++) { 450 | data[i] = ds.read(); 451 | } 452 | 453 | ds.reset_search(); 454 | 455 | byte MSB = data[1]; 456 | byte LSB = data[0]; 457 | float TRead = ((MSB << 8) | LSB); 458 | float Temperature = TRead / 16; 459 | 460 | return Temperature; 461 | 462 | } 463 | --------------------------------------------------------------------------------