PIC LED Flasher

This is a versatile LED or filament bulb flashing kit. The user can add almost any number of LEDs they want to from 1 up to about 160. It was first published in the UK magazine Everyday Practical Electronics in December, 2002. We have modified the design to use a ULN2803A chip instead of all the transistor/resistor combinations which allows not only for quicker construction but even more LEDs than the original design.

Specifications:

• L: 2-1/8" W: 1-5/8" H: 1/2"
• Uses PIC 16F84A
• Flashing pattern is adjustable via dipswitches
• Requires 9 to 12 VDC power supply