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Blue PCB Electronics

2D10B Ky-028 Digital Temperature Thermistor Thermal Sensor Module

2D10B Ky-028 Digital Temperature Thermistor Thermal Sensor Module

Regular price Dhs. 20.00
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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-208 digital temperature sensor module fritzing part


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.

Operating Voltage 3.3V ~ 5.5V
Temperature Measurement Range -55°C to 125°C [-67°F to 257°F]
Measurement Accuracy ±0.5°C
Board Dimensions 15mm x 36mm [0.6in x 1.4in]



Connect the board’s analog output (A0) to pin A0 on the Arduino and the digital output (D0) to pin 3.

Connect the power line (+) and ground (G) to 5V and GND respectively.

Y-028 Arduino
A0 Pin A0
+ +5V
D0 Pin 2

Arduino KY-028 connection diagram


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);

void loop()
  // Read the digital interface
  digitalVal = digitalRead(digitalPin); 
  if(digitalVal == HIGH) // if temperature threshold reached
    digitalWrite(led, HIGH); // turn ON Arduino's LED
    digitalWrite(led, LOW); // turn OFF Arduino's LED

  // Read the analog interface
  analogVal = analogRead(analogPin); 
  Serial.println(analogVal); // print analog value to serial