Determine the Ambient Temperature using Temperature Sensor and Arduino

Aim

To sense and determine the Ambient Temperature using Temperature Sensor and Arduino.

Tools and Components required:

1. Arduino UNO
2. Analog Temperature Sensor
3. Connecting Wires
4. Arduino Software
5. Bread Board

Theory

Analog Temperature Sensor module KY-013 for Arduino, measures ambient temperature based on resistance of the thermistor. The KY-013 Analog Temperature Sensor module consists of a NTC thermistor and a 10 kΩ resistor. The resistance of the thermistor varies with surrounding temperature; we'll use the Steinhart–Hart equation to derive precise temperature of the thermistor.

Specifications

1. Operating Voltage : 5V
2. Temperature measurement range : -55°C to 125°C [-67°F to 257°F]
3. Measurement accuracy : ±0.5°C

Circuit

Program:

int ThermistorPin = A0;

int Vo;

float R1 = 10000;

float logR2, R2, T;

float c1 = 0.001129148, c2 = 0.000234125, c3 = 0.0000000876741;

void setup(){

Serial.begin(9600);

}

void loop() {

Vo = analogRead(ThermistorPin);

R2 = R1 * (1023.0 / (float)Vo - 1.0);

logR2 = log(R2);

T = (1.0 / (c1 + c2*logR2 + c3*logR2*logR2*logR2)); // temperature in Kelvin

T = T - 273.15;

Serial.print("Temperature: ");

Serial.print(T);

Serial.println(" C");

delay(500);

}

Result:The ambient temperature is determined using the KY-013 temperature sensor and arduino.