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 };

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

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

}

void loop() {

  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;
  }

  StaticJsonDocument<96> jsonOut;
  //jsonOut["sensor"] = "1";
  jsonOut[0]["temp"] = tempSensor1;
  jsonOut[0]["state"] = fetState1;

  //jsonOut["sensor"] = "2";
  jsonOut[1]["temp"] = tempSensor2;
  jsonOut[1]["state"] = fetState2;
  serializeJson(jsonOut, Serial);
  Serial.println();
  delay(5000);
  
}