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#include <iostream>
#include <fstream>
#include <unistd.h>
#include <wiringPi.h>
#include <softPwm.h>
#include <ctime>
#define TEMP_PATH "/sys/class/thermal/thermal_zone0/temp"
#define LOG_PATH "/tmp/RaspberrypiFanSpeed.log"
#define PID_PATH "/var/run/autocontrolfan.pid"
#define _FANPIN 8
#define min(x,y) (x<=y?x:y)
using namespace std;
void GetCpuTempera(ifstream &fin,double &temp);
int initWiringPi();
void showInfo();
void SaveLog(ofstream &log, double &temp, int FanSpeed, time_t &time_cur);
int main()
{
showInfo();
ofstream log(LOG_PATH);
if (!log.is_open())
{
cout << "Can't open file : " << LOG_PATH << endl;
}
log.close();
ifstream fin(TEMP_PATH, ios_base::in);
if (!fin.is_open())
{
cout << "Can't open file : " << TEMP_PATH << endl;
return -1;
}
ofstream pid(PID_PATH);
if (!pid.is_open())
{
cout << "Can't open file : " << PID_PATH << endl;
}
pid << getpid() << endl;
pid.close();
pid.clear();
time_t time_cur;
double temp = 0;
int Fan_Speed = 0;
bool Forty_five_Flag = false;
if (initWiringPi() < 0)
{
return -1;
}
while (true)
{
GetCpuTempera(fin,temp);
if (temp >= 42)
cout << "Cpu temperature is : \033[0;31m" << temp << "°C \033[0m" << flush;
else
cout << "Cpu temperature is : \033[1;32m" << temp << "°C \033[0m" << flush;
if (Forty_five_Flag)
{
if (temp < 39.0)
{
Forty_five_Flag = false;
Fan_Speed = 0;
softPwmWrite(_FANPIN, Fan_Speed);
SaveLog(log, temp, Fan_Speed, time_cur);
}
else
{
SaveLog(log, temp, Fan_Speed, time_cur);
}
sleep(1);
}
else
{
if (temp < 39.0)
{
sleep(1);
Fan_Speed = 0;
softPwmWrite(_FANPIN, Fan_Speed);
SaveLog(log, temp, Fan_Speed, time_cur);
}
else if (temp >= 40.0 && temp <= 45.0)
{
Fan_Speed = min(((((int)temp - 40) * 10) + 60),100);
softPwmWrite(_FANPIN, Fan_Speed);
SaveLog(log, temp, Fan_Speed, time_cur);
sleep(2);
}
else if (temp > 45.0)
{
Fan_Speed = 100;
softPwmWrite(_FANPIN, Fan_Speed);
Forty_five_Flag = true;
SaveLog(log, temp, Fan_Speed, time_cur);
sleep(5);
}
}
sleep(1);
cout << "\r";
}
return 0;
}
void GetCpuTempera(ifstream &fin, double &temp)
{
fin >> temp;
temp = temp / 1000.0;
fin.clear();
fin.seekg(0, ios::beg);
}
int initWiringPi()
{
if (wiringPiSetup() != 0)
{
cout << "WiringPi setup failed" << flush << " \r";
return -1;
}
if (softPwmCreate(_FANPIN, 0, 100) != 0)
{
cout << "softPwmcreat setup failed" << flush << " \r";
return -2;
}
return 0;
}
void showInfo()
{
cout << "-------------------------------------------------------------------------------" << endl;
cout << " Project Name : AutoControlRaspberryfan " << endl;
cout << " Author : BDZNH " << endl;
cout << " Project URL : https://github.com/BDZNH/AutoControlRaspberryFan " << endl;
cout << " what is this : Auto control raspberry fan with 5V. Turn the fan " << endl;
cout << " when the temperaure is high than 45°C, turn off " << endl;
cout << " fan when the CPU temperature is lower than 39°C. " << endl;
cout << "-------------------------------------------------------------------------------" << endl;
cout << "\n\n\n" << endl;
}
void SaveLog(ofstream &log, double &temp, int Fan_Speed, time_t &time_cur)
{
log.open(LOG_PATH,ios_base::out);
if (!log.is_open())
{
cout << "Can't open file : " << LOG_PATH << endl;
}
time(&time_cur);
log << ctime(&time_cur) << "CPU temperature is : " << temp << "°C \nSet fan speed to " << Fan_Speed << endl;
log.close();
log.clear();
}
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