Initial commit

fancontrol.c

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