52 lines
1 KiB
C
52 lines
1 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <wiringPi.h>
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int main(int argc, char *argv[]) {
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if(argc < 5) {
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goto err;
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}
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int pin = atoi(argv[1]);
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int period = atoi(argv[2]);
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int thres_on = atoi(argv[3]);
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int thres_off = atoi(argv[4]);
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if(pin == 0 || period == 0 || thres_on == 0 || thres_off == 0) {
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goto err;
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}
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wiringPiSetup();
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pinMode(pin, OUTPUT);
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digitalWrite(pin, HIGH);
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char buf[8];
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FILE *ftemp;
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int temp;
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size_t len;
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int state = 1;
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while(1) {
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ftemp = fopen("/sys/class/hwmon/hwmon0/temp1_input", "r");
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if(ftemp == NULL) {
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temp = 0;
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} else {
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len = fread(buf, 1, 7, ftemp);
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fclose(ftemp);
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ftemp = NULL;
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buf[len] = 0;
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temp = atoi(buf);
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}
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if(temp > thres_on) {
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digitalWrite(pin, HIGH);
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state = 1;
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} else if(state && temp < thres_off) {
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digitalWrite(pin, LOW);
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state = 0;
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}
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sleep(period);
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}
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err:
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printf("Usage: fancontrol <pin wiringPi> <period in seconds> <power on threshold in millicelsius> <power off threshold in millicelsius>\n");
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return 1;
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}
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