LM335

LM335.ino

#if defined(ESP8266)
  #define LM_PIN    A0
#elif defined(ESP32)
  #define LM_PIN    36
#endif

#define ADC_VREF_mV    5000.0 // 5000 is the voltage provided by MCU. If you connect to 3V change to 3000
#define ADC_RESOLUTION 4096.0

void setup() {
  Serial.begin(9600);
}

float getTemperature() {
  #if defined(ESP8266)
    int analogValue = analogRead(LM_PIN);
    float millivolts = (analogValue / 1024.0) * ADC_VREF_mV; 
    float temperature = millivolts / 10;
    // float fahrenheit = ((temperature * 9) / 5 + 32);
    return temperature;
  #elif defined(ESP32)
    int adcVal = analogRead(LM_PIN);
    float milliVolt = adcVal * (ADC_VREF_mV / ADC_RESOLUTION);
    float temperature = milliVolt / 10;
    return temperature;
  #endif
}

void loop()
{
  float temperature = getTemperature();
  Serial.printf("Temperature: %2.1f °C\r\n", temperature);
  delay(1000);
}