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For testing purposes it was connected to a standard Arduino board (Diecimila) using 4 shift registers.

After getting it to work I permatized it on a fabbed PCB.

The shift registers are 8-bit wide and are easily interfaced with the SPI protocol.

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Part of the MCU`s RAM is used as a framebuffer to hold the image.

The video RAM is parsed by an interrupt routine in the background, so the user can do other useful things like talking to a PC, read buttons and potentiometers. Pulse width modulation essentially is turning the power fed to an electrical device ON and OFF pretty quickly.

The usable power results from the mathematical average of the square-wave function taken over the interval of one period.

The longer the function stays in the ON position, the more power you get.

PWM has the same effect on the brightness of LEDs as a dimmer on AC lights.

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