Add examples

4ch_fet/main.c

@@ -0,0 +1,22 @@
+#include <wiringPi.h>
+
+#define PIN_CH0 8  // PIN 3
+#define PIN_CH1 9  // PIN 5
+#define PIN_CH2 7  // PIN 7
+#define PIN_CH3 15 // PIN 8
+
+static int pins[] = {PIN_CH0, PIN_CH1, PIN_CH2, PIN_CH3};
+static int pins_len = 4;
+
+int main(void){
+	wiringPiSetup();
+
+	for(int i = 0; i < pins_len; i++) {
+		pinMode(pins[i], OUTPUT);
+		digitalWrite(pins[i], LOW);
+		delay(1000);
+		digitalWrite(pins[i], HIGH);
+	}
+
+	return 0;
+}