🌡️ ماموریت ۵۲: ترموستات هوشمند

سیم‌کشی

1. Arduino Uno (VCC5) ⟷ Temperature Sensor (LM35) (VCC)
2. Temperature Sensor (LM35) (OUT) ⟷ Arduino Uno (A0)
3. Temperature Sensor (LM35) (GND) ⟷ Arduino Uno (GND1)
4. Arduino Uno (VCC5) ⟷ Relay (5V) (VCC)
5. Arduino Uno (D7) ⟷ Relay (5V) (IN)
6. Relay (5V) (GND) ⟷ Arduino Uno (GND2)

کد

const int RELAY = 7;
const float LOW_T = 20.0;    // heater on below this
const float HIGH_T = 22.0;   // heater off above this
bool heating = false;

void setup() {
  pinMode(RELAY, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  float volts = analogRead(A0) * 5.0 / 1023.0;
  float tempC = (volts - 0.5) * 100.0;   // TMP36
  if (tempC < LOW_T) heating = true;
  if (tempC > HIGH_T) heating = false;   // between 20 and 22: keep the old state
  digitalWrite(RELAY, heating ? HIGH : LOW);
  Serial.println(tempC);
  delay(500);
}