will bang on and the LCD display will blink “TIMER ALERT!”. An optional RELAY driver output is available at pin 4 of the Arduino board. If you wish to add an electromagnetic relay to switch off/switch ...

In this quick Arduino tutorial I will explain how you can ... is used to delay() the program execution with the desired amount of time. In our case after the button is pressed the relay will be ...

Droplet and StackAR, developed by MIT’s Media Lab, allow users to set timers or program an Arduino using light-based communication. By pressing the tool against a screen, flashes of light can ...