Initial version

This commit is contained in:
Ferit Yiğit BALABAN 2023-08-07 17:11:01 +03:00
parent 092e1e293f
commit 7b1e6c7d84
Signed by: fyb
GPG Key ID: E21FEB2C244CB7EB

79
main.c Normal file
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/*
* Ferit Yiğit BALABAN, fybalaban@fybx.dev
* rpi-fan-control 2023
*/
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <pigpio.h>
#define TEMP_PATH "/sys/class/thermal/thermal_zone0/temp"
#define FAN_PIN 17
#define HIGH 1
#define LOW 0
int main(int argc, char** argv) {
int fd;
char buffer[6];
int fanRunning;
double temperature;
int threshold;
int variance;
if (argc != 3) {
printf("Expected threshold temperature and variance\n");
return -1;
}
threshold = atoi(*(argv + 1));
variance = atoi(*(argv + 2));
if (!threshold) {
printf("Expected integer for threshold temperature: %s\n", *(argv + 1));
return -2;
} else if (!variance) {
printf("Expected integer for variance: %s\n", *(argv + 2));
return -3;
}
if (gpioInitialise() < 0) {
printf("Failed to initialize GPIO.\n");
return 1;
}
gpioSetMode(FAN_PIN, PI_INPUT);
fanRunning = gpioRead(FAN_PIN);
gpioSetMode(FAN_PIN, PI_OUTPUT);
fd = open(TEMP_PATH, O_RDONLY);
if (fd < 0) {
printf("Error opening temperature file\n");
return 2;
}
if (read(fd, buffer, sizeof(buffer)) < 0) {
printf("Error reading temperature\n");
close(fd);
return 3;
}
close(fd);
temperature = atof(buffer) / 1000.0;
printf("CPU Temperature: %.2f°C\n", temperature);
if (!fanRunning && temperature >= threshold + variance) {
gpioWrite(FAN_PIN, HIGH);
printf("Setting pin GPIO17 to HIGH\n");
} else if (temperature <= threshold - variance) {
gpioWrite(FAN_PIN, LOW);
printf("Setting pin GPIO17 to LOW\n");
} else {
printf("Pin GPIO17 is already HIGH\n");
}
gpioTerminate();
return 0;
}