Analog Temperature Sensor module for Arduino, measures ambient temperature based on resistance of the thermistor.
Specifications:
The NTC Analog Temperature Sensor module consist 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.
Operating Voltage
5V
Temperature measurement range
-55°C to 125°C [-67°F to 257°F]
Measurement Accuracy
±0.5°C
Connection Diagram:
Connect board's power line (middle) and ground (-) to 5V and GND respectively. Connect signal (S) to pin A0 on the Arduino.
S
A0
middle
5V
-
GND
Some KY-013 boards are labeled incorrectly, if you are getting inverted readings (temperature drops when sensor is heated) try swapping power(middle) and ground (-).Example Code:
The following Arduino Sketch will derive the temperature of the thermistor using the Steinhart-Hart equation. The code will return temperature in Celcius, uncomment line 17 to get temperature in farenheit. int ThermistorPin = A0; int Vo; float R1 =10000; // value of R1 on board
float logR2, R2, T; float c1 =0.001129148, c2 =0.000234125, c3 =0.0000000876741; //steinhart-hart coeficients for thermistor
voidsetup(){ Serial.begin(9600); }voidloop(){ Vo =analogRead(ThermistorPin); R2 = R1 *(1023.0/(float)Vo -1.0); //calculate resistance on thermistor
logR2 = log(R2); T =(1.0/(c1 + c2*logR2 + c3*logR2*logR2*logR2)); // temperature in Kelvin
T = T -273.15; //convert Kelvin to Celcius
// T = (T * 9.0)/ 5.0 + 32.0; //convert Celcius to FarenheitSerial.print("Temperature: "); Serial.print(T); Serial.println(" C");delay(500); }
The coeficients only apply to boards with a 10KΩ thermistors, some rare boards have 100KΩ thermistors and need different coeficients. If the displayed temperature drops when heating the thermistor and viceversa a try swapping power and ground, apparently these boards are commonly mislabeled
