update

main.go

@@ -17,7 +17,8 @@ func main() {
 		panic(err)
 	}
 	defer gpio.Close()
-	pin := gpio.NewPin(gpio.GPIO7)
+	pinNumber := gpio.GPIO7
+	pin := gpio.NewPin(pinNumber)
 	pin.Input()
 	pin.PullUp()
 
@@ -27,7 +28,7 @@ func main() {
 	defer signal.Stop(quit)
 
 	err = pin.Watch(gpio.EdgeBoth, func(pin *gpio.Pin) {
-		fmt.Printf("Pin 4 is %v", pin.Read())
+		fmt.Printf("Pin %v is %v", pinNumber, pin.Read())
 	})
 	if err != nil {
 		panic(err)
@@ -36,7 +37,7 @@ func main() {
 
 	// In a real application the main thread would do something useful here.
 	// But we'll just run for a minute then exit.
-	fmt.Println("Watching Pin 4...")
+	fmt.Printf("Watching Pin %v...", pinNumber)
 	select {
 	case <-time.After(time.Minute):
 	case <-quit: