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.
For Les Grant's complete instructions to build your own Flashing Heart, click here.
Flashing Heart Parts List
Allied Part #
9V Power Supply STA-9530A
Ceramic Cap 27pF
Ceramic Cap 100nF
Crystal 12 Mhz
PNP Transistor BC557
Red LED T-1 3/4
Resistor 2.2K .25W
Resistor 120 ohms .25W
Additional parts required: Atmel AT89C2051 MCU; Circuit board or perf board; Eprom (optional) 24C16
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