PIC, AVR, and Arduino ... capacitor later he’s in business, adding another resistor and a transistor to deal with the load switching. We’ve embedded video of the circuit controlling an LED ...

When you read “Arduino wristwatch”, you fall into the ... the time because it is bad on the battery. When you press the button once, you get one of the LEDs to light to show the hours.

Here, a common cathode 7-segment LED display is connected to Arduino for displaying the digits. The code (Arduino sketch) allows push button increment of the counter from 0 to 9. The whole circuit can ...