描述
KY-028 數碼訊號溫度模組 DIGITAL TEMPERATURE SENSOR MODULE
Digital Temperature Sensor KY-028 for Arduino, it measures temperature changes based on the thermistor resistance. This module has both digital and analog outputs, there’s a potentiometer to adjusts the detection threshold on the digital interface.
KY-028 Specifications
The KY-028 consist of a of a NTC thermistor, a LM393 dual differential comparator a 3296W trimmer potentiometer, six resistors and two indicator LEDs. The board features an analog and a digital output.
Operating Voltage | 3.3V to 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] |
KY-028 Connection Diagram
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.
KY-028 | Arduino |
A0 | A0 |
G | GND |
+ | 5V |
D0 | 2 |

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 clock-wise 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 analog output pin is directly connected to the potentiometer it isn’t possible to use the Steinhart-Hart equation to calculate the temperature as 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);
}
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