Got no code, other than the analog in / serial sketch I mentioned. Got no schematic, other than two contact points out of the device marked + and -...
Could I program a way to take several snapshots of the voltage reading and average them? I thought of this, but at this point all the readings seem to be unrelated to one another, and the voltage should be a steady reading out, as it is the light reading from a diode, used as a light sensor.
As to the advice about limiting the bandwith of the signal, I will look into that. thank you very much.
My son gave me a MEGA for Christmas... gonna try that, too.
Thanks everyone, and merry christmas/happy holidays!
jim