Did you know that you can use Arduino to turn on an LED when you press a button? Well, it is true, you can do this! Leaving the joke aside, let me show how you can achieve this. You will need the ...

Let it hit your red LED and you’ve lost a point. But if you can push your button ... box is an Arduino Uno and a 9V battery, plus a current-limiting resistor and the all-important buzzer.

Digital (pwm) pin D3 drives the piezo-buzzer through a PNP transistor ... helped me to clear that issue. This simple Arduino sketch can be used to test the multifunction shield. The code fades an ...