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
Allied Part #
9V Power Supply STA-9530A
Ceramic Cap 27pF
Ceramic Cap 100nF
Crystal 12 MHz
Eprom (optional) 24C16
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
For Les Grant's complete instructions to build your own Flashing Heart, click here.
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