The

Dusk

is a DIY kit by the 1scale1 designers D. Sjunnesson and T. Olsson that will allow for adding up to 64 outputs to your microcontroller project. It is daisy-chainable, what means you can keep on adding groups of 64 outputs.

The kit includes a breakout board for four TLC5940 integrated circuits chained together. The board pushes pwm (pulse width modulation) to its 64 different pins and it is controlled over serial communication. The IC's max rating is 17V and 120mA/pin. This is adjustable by an resistor down to about 10 mA/pin.

The circuit counts with a DC jack where to input the maximum voltage to be used in dimming your devices. Essentially the chips on the board are switching the signals between that voltage and ground.

This design is an evolution of the Dawm Kit, also available at BlushingBoy. You can find references about work made with this chip at the Arduino playground, where it is possible to find a long post about the TLC5940. If you are looking for the chip's datasheet, you can get it here from Texas Instruments.