Here is a simple, yet useful circuit of an Arduino 4-digit 7-segment LED display unit ... driver transistors are recommended to provide additional driving current to the LED segments, because each pin ...

If we put in the sockets four 7-segments LED common cathode LCD display devices, we should connect the pin 33 of the board (the common pin) to the Arduino GND signal ... pin 14 on the 74hc595 int ...

Adding to the ever growing list of Ardunio watches being created a new LED Arduino watch has been created that is powered by a supercapacitor. The watch has been featured over on the Hack A Day ...