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=== Circuit Board ===
 
=== Circuit Board ===
[[Image:Pmpt-ControllerCircuit.jpg|thumb|250px|The USB HID controller's cirtuic diagram]]
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[[Image:Pmpt-ControllerCircuit.jpg|thumb|250px|The USB HID controller's circuit diagram]]
 
[[Image:Pmpt-ControllerBack.jpg|thumb|250px|The USB HID controller's back side]]
 
[[Image:Pmpt-ControllerBack.jpg|thumb|250px|The USB HID controller's back side]]
 
This is the basic circuit diagram for the USB HID controller based on [http://www.atmel.com/ ATMEL's] ATMega8. It runs on an 12MHz clock, so be sure to get the 16MHz version. The 27pF capacitors are of ceramic disc type. The 100nF capacitor should be close to the controller with short wires to the supply voltage. The two Z-diodes limit the USB bus voltage and the 1k5Ohm Resistor tells the USB host that this is a low speed device. Check [http://www.obdev.at/products/vusb/ obdev.at's site] for details. Their reference projects contains tons of information and further readings.
 
This is the basic circuit diagram for the USB HID controller based on [http://www.atmel.com/ ATMEL's] ATMega8. It runs on an 12MHz clock, so be sure to get the 16MHz version. The 27pF capacitors are of ceramic disc type. The 100nF capacitor should be close to the controller with short wires to the supply voltage. The two Z-diodes limit the USB bus voltage and the 1k5Ohm Resistor tells the USB host that this is a low speed device. Check [http://www.obdev.at/products/vusb/ obdev.at's site] for details. Their reference projects contains tons of information and further readings.

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