arduino-fridge-powercontrol/main/main.ino

/* References:
 * https://lastminuteengineers.com/multiple-ds18b20-arduino-tutorial/
*/
#include "ArduinoJson.h"

#include <OneWire.h>
#include <DallasTemperature.h>

// Data wire is conntec to the Arduino digital pin 4
#define ONE_WIRE_BUS 2
#define MOSFET1 3
#define MOSFET2 4
// Setup a oneWire instance to communicate with any OneWire devices
OneWire oneWire(ONE_WIRE_BUS);

// Pass our oneWire reference to Dallas Temperature sensor 
DallasTemperature sensors(&oneWire);
DeviceAddress Thermometer;
int deviceCount = 0;

int analogPin = 2;
int data = 0;
char userInput;
char* commandVer;
// temperature values in °C 
float tempSensor1;
float tempSensor2;
// HighTemp - when to turn on the power
float HTemp1 = 12.0;
float HTemp2 = 16.0;
// LowTemp - when to turn of the power
float LTemp1 = 10.0;
float LTemp2 = 14.0;
bool fetState1;
bool fetState2;

uint8_t addrSensor1[8] = { 0x28, 0xFF, 0x64, 0x1F, 0x79, 0xD1, 0xB1, 0x75 };
uint8_t addrSensor2[8] = { 0x28, 0xFF, 0x64, 0x1F, 0x79, 0xD7, 0xDA, 0x9A };
/*

// countLowTemp
int cLTemp1 = 0;
int cLTemp2 = 0;
// countHighTemp
int cHTemp1 = 0;
int cHTemp2 = 0;
// loops to count temp before switching state
int cTemp = 5;

*/

void setup() {
  // put your setup code here, to run once:
  pinMode(MOSFET1, OUTPUT);
  pinMode(MOSFET2, OUTPUT);

 
  Serial.begin(9600);
  sensors.begin();

  // locate devices on the bus
  Serial.println("Locating devices...");
  Serial.print("Found ");
  deviceCount = sensors.getDeviceCount();
  Serial.print(deviceCount, DEC);
  Serial.println(" devices.");
  Serial.println("");
  
  Serial.println("Printing addresses...");
  for (int i = 0;  i < deviceCount;  i++)
  {
    Serial.print("Sensor ");
    Serial.print(i+1);
    Serial.print(" : ");
    sensors.getAddress(Thermometer, i);
    printAddress(Thermometer);
  }

  Serial.println("");
  Serial.print("MOSFET1 start temp: ");
  Serial.print(HTemp1);
  Serial.print("°C, stop temp: ");
  Serial.print(LTemp1);
  Serial.println("°C");
  Serial.print("MOSFET2 start temp: ");
  Serial.print(HTemp2);
  Serial.print("°C, stop temp: ");
  Serial.print(LTemp2);
  Serial.println("°C");
}

void loop() {
  // put your main code here, to run repeatedly:

//if(Serial.available()>0) {

  sensors.requestTemperatures(); 

  
  tempSensor1 = sensors.getTempC(addrSensor1);
  if(tempSensor1 > HTemp1) {
    digitalWrite(MOSFET1, HIGH);
    fetState1 = 1;
  } else if(tempSensor1 < LTemp1) {
    digitalWrite(MOSFET1, LOW);
    fetState1 = 0;
  }
  
  tempSensor2 = sensors.getTempC(addrSensor2);
  if(tempSensor2 > HTemp2) {
    digitalWrite(MOSFET2, HIGH);
    fetState2 = 1;
  } else if(tempSensor1 < LTemp1) {
    digitalWrite(MOSFET2, LOW);
    fetState2 = 0;
  }


  /*
  Serial.print("Sens 1 ");  
  Serial.print("Celsius temperature: ");
  // Why "byIndex"? You can have more than one IC on the same bus. 0 refers to the first IC on the wire
  Serial.print(sensors.getTempC(addrSensor1)); 
  Serial.print(" - Fahrenheit temperature: ");
  Serial.print(sensors.getTempF(addrSensor1));
  Serial.print(" - MOSFET1 Sate: ");
  Serial.println(fetState1);

  Serial.print("Sens 2 ");  
  Serial.print("Celsius temperature: ");
  // Why "byIndex"? You can have more than one IC on the same bus. 0 refers to the first IC on the wire
  Serial.print(sensors.getTempC(addrSensor2)); 
  Serial.print(" - Fahrenheit temperature: ");
  Serial.print(sensors.getTempF(addrSensor2));
  Serial.print(" - MOSFET2 Sate: ");
  Serial.println(fetState2);
  */

  StaticJsonDocument<96> jsonOut;
  //jsonOut["sensor"] = "1";
  jsonOut["sensor1"]["temp"] = tempSensor1;
  jsonOut["sensor1"]["state"] = fetState1;

  //jsonOut["sensor"] = "2";
  jsonOut["sensor2"]["temp"] = tempSensor2;
  jsonOut["sensor2"]["state"] = fetState2;
  serializeJson(jsonOut, Serial);
  Serial.println();
  /*
  digitalWrite(MOSFET, HIGH);
  delay(2000);
  digitalWrite(MOSFET, LOW);
  delay(2000);
  */
  delay(1000);
//  }
  
}

void printAddress(DeviceAddress deviceAddress)
{ 
  for (uint8_t i = 0; i < 8; i++)
  {
    Serial.print("0x");
    if (deviceAddress[i] < 0x10) Serial.print("0");
    Serial.print(deviceAddress[i], HEX);
    if (i < 7) Serial.print(", ");
  }
  Serial.println("");
}