KY-028 Digital Temperature Sensor Module

The KY-028 Digital Temperature Sensor measures temperature changes based on thermistor resistance. This module has both digital and analog outputs, there’s a potentiometer to adjust the detection threshold on the digital interface.

Compatible with Arduino, Raspberry Pi, ESP32, and other microcontrollers.

KY-028 Specifications

This module consists of an NTC thermistor, an LM393 dual differential comparator, a 3296W trimmer potentiometer, 6 resistors, 2 LEDs, and 4 male header pins. The module features analog and digital outputs.

Connection Diagram

KY-028 Arduino Code

When the temperature threshold is reached, the digital interface will send a HIGH signal turning on the LED on the Arduino (pin 13). Turn the potentiometer clockwise to increase the detection threshold and counter-clockwise to decrease it.

The analog interface returns a numeric value that depends on the temperature and the potentiometer’s position. 

Since the analog output pin is directly connected to the potentiometer it isn’t possible to use the Steinhart-Hart equation to calculate the temperature as we did with the KY-013, we can only use this value to measure relative changes in temperature.

int led = 13; // define the LED pin
int digitalPin = 2; // KY-028 digital interface
int analogPin = A0; // KY-028 analog interface
int digitalVal; // digital readings
int analogVal; //analog readings
void setup()
{
  pinMode(led, OUTPUT);
  pinMode(digitalPin, INPUT);
  //pinMode(analogPin, OUTPUT);
  Serial.begin(9600);
}
void loop()
{
  // Read the digital interface
  digitalVal = digitalRead(digitalPin); 
  if(digitalVal == HIGH) // if temperature threshold reached
  {
    digitalWrite(led, HIGH); // turn ON Arduino's LED
  }
  else
  {
    digitalWrite(led, LOW); // turn OFF Arduino's LED
  }
  // Read the analog interface
  analogVal = analogRead(analogPin); 
  Serial.println(analogVal); // print analog value to serial
  delay(100);
}

Downloads

• Fritzing Part: KY-028 Digital Temperature Sensor Module.
• LM393 comparator datasheet.
• 3296W-104 trimmer datasheet.

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