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Using the Temperature Sensor Module KY-013 with Arduino

Introduction

In this tutorial, we will learn about the KY-013 module, what is an NTC Thermistor and we will build a simple project to read ambient temperature using the KY-001 module and an Arduino.

Temperature Sensor Module KY-013

The KY-013 Module will be our main component for this tutorial. This module has an NTC Thermistor and mounted on a breakout board with a 10K-ohm resistor. Figure 1 shows the module as seen in fritzing.

Figure 1: KY-013 Temperature Sensor Module
Figure 1: KY-013 Temperature Sensor Module

Pin Out:

The KY-013 module has three pins.

Component PinArduino Uno board Pin
(-)GND
middle+5V
SSignal

What is an NTC Thermistor?

An NTC Thermistor is a Negative Temperature Coefficient resistor. This means that the resistance is inversely proportional to temperature. The resistance increases when temperature decreases and vice-versa.

Project: Arduino Analog Ambient Thermometer

After learning about the KY-013 module and the NTC Thermistor, it is now time to build a project using the module. Our project will read the resistance value from the KY-013 module. The value obtained will then be used to calculate the temperature and display it on the serial monitor.

Project Components

For this project, we need the following components:

  • Arduino Uno board (1 pc.)
  • KY-013 Temperature Sensor Module (1 pc.)
  • Jumper wires

Wiring Diagram

Figure 2 shows the connection between the Arduino Uno and the KY-013 Temperature Sensor Module.

Figure 2: Connection Diagram
Figure 2: Connection Diagram

The KY-013 module pins are connected to the Arduino Uno board as follows:

Component PinArduino Uno board Pin
(-)GND
middle+5V
SA0

Code

Below is the Arduino sketch for our project. I have added comments to explain important parts of the code. Save the code as KY-013.ino and upload it to your Arduino board.

// Arduino and KY-013 tutorial

void setup() {
  Serial.begin(9600);   // initialize serial interface with baud 9600bps
}

void loop() {
  // Read value from module connected at pin A0
  int V_input = analogRead(A0);

  // calculate thermometer resistance by comparing it to the modules onboard 10K-ohm resistor
  float R_ohms = 10000 * (1023.0 / (float)V_input - 1.0);

  // calculate temperature in Celsius
  float temp_C = (1.0 / (0.001129148 + (0.000234125*log(R_ohms)) + 0.0000000876741*log(R_ohms)*log(R_ohms)*log(R_ohms)))-273.15;

  // output result to serial
  Serial.print("Temperature (degC): ");
  Serial.println(temp_C);
}

 

Project Test

Apply power to your Arduino Uno board and open the Serial Monitor in the Arduino IDE. Arduino calculates the temperature based on the reading from the KY-013 module connected to pin A0 and displays the result on the serial monitor every second.

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