Freenove Ultimate Starter Kit User Manual

131
Chapter 11 Thermistor
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Code
In this project code, the ADC value is still needed to be read, and the difference is that a specific formula is
used to calculate the temperature value.
C Code 11.1.1 Thermometer
First observe the project result, and then analyze the code.
Use cd command to enter 11.1.1_Thermometer directory of C code.
cd ~/Freenove_Ultimate_Starter_Kit_for_Raspberry_Pi/Code/C_Code/11.1.1_Thermometer
1. Use following command to compile “Thermometer.c” and generate executable file “Thermometer”. “-lm”
option is needed.
gcc Thermometer.c -o Thermometer -lwiringPi -lm
2. Then run the generated file “Thermometer”.
sudo ./Thermometer
After the program is executed, the terminal window will print out the current ADC value, voltage value and
temperature value. Try to pinch the thermistor (do not touch pin) with hand lasting for a while, then the
temperature value will be increased.
The following is the code:
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#include <wiringPi.h>
#include <pcf8591.h>
#include <stdio.h>
#include <math.h>
#define address 0x48 //pcf8591 default address
#define pinbase 64 //any number above 64
#define A0 pinbase + 0
#define A1 pinbase + 1
#define A2 pinbase + 2
#define A3 pinbase + 3
int main(void){

Freenove Ultimate Starter Kit Specifications

General

Brand	Freenove
Model	Ultimate Starter Kit
Category	Single board computers
Language	English