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Arduino oscilloscope

A very basic and easy to make arduino PC oscilloscope.Features: 50K samples/second(actually it can go up to 110K but the signal will become noisy) Auto trigger Frequency counter Reasonably accurate voltage readings (depending on the accuracy of the resistors used for the voltage dividers)

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I = Vin/(R1 + R2) Sparkfun site about Voltage Divider circuits. Potentially useful circuit.

The Switchable Voltage Divider ($15 USD) lets you interface with all sorts of non-Phidgets resistance sensors, just select the resistance you want and away you go.

Voltage Divider

Voltage divider - Wikipedia