With my sights set on a simpler, more fashionable design, I figure I would recap what I did for the first version of this project starting with a partial parts list from Sparkfun. Additional items not on the list are: wire, resistors, connectors, a parts case, heart rate monitor strap, and a switch.
The basic idea is this: The hrmi board gets a wireless signal from the strap sensor. The board is connected to the arduino and is communicating using i2c. The arduino then changes the text display and LED brightness and color settings and voila the heart on the front pulses with the wearer's heart rate and changes from blue to red as the heart rate goes up. Also, the white LEDs on the back of the shirt pulse with the heart rate.
This is not a one to one pulse display, but the hrmi takes an error-corrected average of the user's heart rate over time. If you'd like to see the source code let me know, but eventually I will be sharing it on GitHub.
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