Introduction
A thermistor is a type of resistor whose resistance varies significantly with temperature.
Components
– 1 * SunFounder Uno board
– 1 * USB data cable
– 1 * Thermistor
– 1 * Resistor (10K)
– Several jumper wires
Experimental Principle
The resistance of the thermistor varies significantly with ambient temperature. It can detect surrounding temperature changes in real time. Send the temperature data to analog I/O port of SunFounder. Next we only need to convert sensor output to Celsius temperature by simple programming and display it on the serial port.
Experimental Procedures
Step 1: Build the circuit
The schematic diagram
Step 2: Program (Please refer to the example code in LEARN -> Get Tutorial on our website)
Step 3: Compile the code
Step 4: Upload the sketch to the SunFounder Uno board
Now, you can see current temperature displayed on the serial monitor.
Code
| /************************************ * name:thermistor * function:you can see current temperature displayed on the serial monitor. **************************************/ //Email: support@sunfounder.com //Website: www.sunfounder.com#define analogPin A0 //the thermistor attach to #define beta 4090 //the beta of the thermistor #define resistance 10 //the value of the pull-down resistorvoid setup() { Serial.begin(9600); }void loop() { //read thermistor value long a = analogRead(analogPin); //the calculating formula of temperature float tempC = beta /(log((1025.0 * 10 / a – 10) / 10) + beta / 298.0) – 273.0; //float tempF = 1.8*tempC + 32.0;//convert centigrade to Fahrenheit Serial.print(“TempC: “);//print” TempC: “ Serial.print(tempC);//print Celsius temperature Serial.print(” C”);//print the unit Serial.println(); //Serial.print(“TempF: “); // Serial.print(tempF); // Serial.print(” F”); delay(200); //wait for 200 milliseconds } |
Video