Looking for cool way of wowing that special someone on Valentines Day/birthday/whatever? Build her a flashing heart made from LEDs driven by a programmable microcontroller. Les' gadget is simple to build and made from easily-obtainable parts. The unique thing about this design is the LEDs are in an X-Y matrix so each LED is addressable. This allows an unlimited combination of displayed patterns for the heart - not like some other designs out there! Source code and schematics are all available here and if you're not into hand wiring, even the PCB can be had for a small fee. Diamonds may be a girl's best friend but gadgets are forever.
|Flashing Heart Parts List|
|Amt||Part Description||Allied Part #|
|1||9V Power Supply STA-9530A||928-9685|
|2||Ceramic Cap 27pF||881-5122|
|3||Ceramic Cap 100nF||507-0218|
|1||Crystal 12 MHz||895-0687|
|1||Eprom (optional) 24C16||652-0019|
|5||PNP Transistor BC557||431-0475|
|30||Red LED T-1 3/4||679-9981|
|5||Resistor 2.2K .25W||832-0405|
|6||Resistor 120 ohms .25W||895-3139|
|Additional parts required: Atmel AT89C2051 MCU; Circuit board or perf board
For Les Grant's complete instructions to build your own Flashing Heart, click here .