Charlieplexed PWM Heart

What is it?

A design for a heart-shaped PCB with a charlieplexed array of LEDs controlled by an ATTiny85 microcontroller.

Demo

• [File:https://dl.dropboxusercontent.com/u/10205003/VIDEO0005.mp4]
• Another demo

Step-by-step Assembly Guide

• On Instructables

• Photos of assembly

Source Code for firmware and 3D-printed case

Github: https://github.com/rmd6502/charlie_heart

Eagle files are in the Charlie directory

Parts list

Quantity	Description	Location
1	ATTiny85	[1]
5	3Ω resistors	[2]
1	1kΩ resistor	[3]
1	.1 µF capacitor	[4]
20	SMD LEDs	[5]
1	P channel MOSFET
1	Tactile NO SPST switch
1	CR2032 battery holder	[6], or part number 270-009 at Radio Shack - I'll order more from Digikey
1	CR2032 battery	[7]

To program the firmware you'll need an AVR Dragon, and the tiny JST 6pin header