my 8 channel usb gpio module arrived today. I am able to turn on led's, now I want to take advantage of the adc read features. I have a ds18b20 prob which I hook up to ground and pin 0 when i do an adc read on pin 0 i get a crazy ready which varies. What types of temperature probes are compatible with the module? and do they require extra hardware. my the usermanual talks of these fancy feature but doesn't go into any detail.