Alessio Facchin
Published

Thermostat

A smart thermostat that you can manage via the cloud

IntermediateFull instructions provided2 hours85
Thermostat

Things used in this project

Hardware components

Photon
Particle Photon
×1
Adafruit Waterproof DS18B20 Digital temperature sensor
Adafruit Waterproof DS18B20 Digital temperature sensor
×1
Jumper wires (generic)
Jumper wires (generic)
×5
JS Series Switch
C&K Switches JS Series Switch
×1
Breadboard (generic)
Breadboard (generic)
×1

Software apps and online services

VS Code
Microsoft VS Code
Particle Build Web IDE
Particle Build Web IDE

Hand tools and fabrication machines

Multitool, Screwdriver
Multitool, Screwdriver

Story

Read more

Schematics

Thermostat

The circuit

Code

Thermostat

C/C++
I relase a thermost using iotready.platform
#include <DS18B20.h>
/*
 * Project termostato
 * Description:
 * Author:
 * Date:
 */

// setup() runs once, when the device is first turned on.

int button, shiftStatus, relay1;
int latchPin = A3;
int dataPin = A4;
int clockPin = A2;
const int MAXRETRY = 4;
const int16_t dsData = D7;
const uint32_t msSAMPLE_INTERVAL = 5000;
double soglia = 0;
double actualTemp = 0;

DS18B20  ds18b20(dsData, true); 

double celsius;
uint32_t msLastMetric;
uint32_t msLastSample;

void setup() {
  // Put initialization like pinMode and begin functions here.
  pinMode(D3, INPUT);
  pinMode(latchPin, OUTPUT);
  pinMode(dataPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  Particle.variable("bottone", button);
  Particle.variable("soglia", soglia);
  Particle.variable("Tempreatura attuale", actualTemp);
  Particle.function("setSoglia", setPoint);
  Particle.variable("Relay", relay1);

  Serial.begin(9600);
}

// loop() runs over and over again, as quickly as it can execute.
void loop() {
  // The core of your code will likely live here.
  button = digitalRead(D3);
  if (millis() - msLastSample >= msSAMPLE_INTERVAL){
    getTemp();
    actualTemp = celsius;
  }

  if(button == 1){
    if(actualTemp < soglia){
      relay1 = 1;
      registerWrite();
    }else{
      relay1 = 0;
      registerWrite();
    }
  }else{
    relay1 = 0;
    registerWrite();
  }

}

void registerWrite() {

    shiftStatus = 8*relay1;

    digitalWrite(latchPin, LOW);
    shiftOut(dataPin, clockPin, MSBFIRST, shiftStatus);
    digitalWrite(latchPin, HIGH);
}

void getTemp(){
  float _temp;
  int   i = 0;

  do {
    _temp = ds18b20.getTemperature();
  } while (!ds18b20.crcCheck() && MAXRETRY > i++);

  if (i < MAXRETRY) {
    celsius = _temp;
  }
  else {
    celsius = NAN;
    Serial.println("Invalid reading");
  }
  msLastSample = millis();
}

int setPoint(String point){
  soglia = point.toFloat();
  return 1;
}

Credits

Alessio Facchin

Alessio Facchin

3 projects • 2 followers
I have recently started my journey in the iot world! I'm really happy

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