XC3902 Instructions Addendum

The XC3902 Duinotech Arduino® Compatible UNO Starter Kit can be used to construct a variety of DIY projects. 

Project 3 (Using buttons) in the instructions has a misprint where the push-button is only connected to the ground (black wire), so please refer to the image below when wiring your project.

Optional code you can use:

void setup()

{ pinMode(2, INPUT_PULLUP);

pinMode(8, OUTPUT };

}

void loop()

{if (digitalRead(2) == LOW)

{ digitalWrite(8, HIGH);

} else { digitalWrite(8, LOW);

}

} 

If your project uses: 

1. Pin 2 → Push button connected to GND

2.Pin 8 → Active buzzer (4-pin buzzer module)