Boron ADC outputting random values

Hardware
1

When connected to a varying voltage source the ADCs output is little better than random, outputs varying from 0 to 4445+, the voltage range is 0-0.4V, when testing the ADC with the 3.3V bus the output is in the 1000-2000 range I have tried this with 2 new borons and have got the same result. Any suggestions, please?

2

You do have the signal ground and the Boron's GND connected, right?
You also don't need (want) to call pinMode() before analogRead() as analogRead() implicitly sets a special pin mode.

3

thanks, I was using a separate power supplies for the signal and boron, using the same one fixed the problem

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4

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