Hello jimfordI use the Arduino with Pololu Current Hall sensors (Pololu 1186) for remote network current measurement.http://www.pololu.com/catalog/product/1186I see your sensor has 5V operating voltage:Try this:be sure the sensor-arduino cables are as short as possibleconnect the sensor Vcc to the Arduino Analog Reference pin (NOT to other 5V pins or external source!!)connect the sensor OUT with a shielded cable (shield to GND)try several GND Arduino pins for sensor GND pin connection to minimize the jitter, it should be the GND pin with physically shortest connection to the A/D converter ICtry to more stabilize the arduino main voltage, the usb connection only may not be sufficientThe digital A/D output ripple should be in WORST CASE not over +-1, for example 511,512,513 Hope this helpsRegardsPavel
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