I did build the very simple hardware to make a MiniPOV (8 RED LEDs + 1
MCU ATtiny24 + 2 AAA cells), I am waiting now for a board of
avropendous to build my own AVR ISP programmer.
The firmware for MiniPOV is strict simple!! just send raw data to
LEDs, no use of sensor hall effect or external memory. I think I will
quickly do a firmware code for MiniPOV, for BicycleLEDPOV hardware :-)