Freenove Ultimate Starter Kit User Manual

Chapter 13 Motor & Driver
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Code
In this project code, first read the ADC value, and then control the rotation direction and speed of the motor
according to the value of the ADC.
C Code 13.1.1 Motor
First observe the project result, and then analyze the code.
1. Use cd command to enter 13.1.1_Motor directory of C code.
cd ~/Freenove_Ultimate_Starter_Kit_for_Raspberry_Pi/Code/C_Code/13.1.1_Motor
2. Use following command to compile “Motor.c” and generate executable file “Motor”. “-lm” and “-lpthread”
option is needed.
gcc Motor.c -o Motor -lwiringPi -lm -lpthread
3. Then tun the generated file ”Motor”.
sudo ./Motor
After the program is executed, shift the potentiometer, then the rotation speed and direction of the motor
will change with it. And when the potentiometer is turned to midpoint position, the motor stops running.
When away from the middle position, the motor speed will increase. When to both ends, motor speed reach
to maximum. When the potentiometer is turned to different side of the middle position, the motor will run
with different direction. Meanwhile, the terminal will print out ADC value of the potentiometer, the motor
direction and the PWM duty cycle used to control motor speed.
The following is the code:
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#include <wiringPi.h>
#include <pcf8591.h>
#include <stdio.h>
#include <softPwm.h>
#include <math.h>
#include <stdlib.h>
#define address 0x48 //pcf8591 default address
#define pinbase 64 //any number above 64

Freenove Ultimate Starter Kit Specifications

General

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