I need to have a random seed which is different every time I turn on the Arduino.
I remember reading many moons ago that the voltage across a reverse biased diode is a good source of white noise. For my purposes I'd guess that I could use the bottom two bits (several times) of a byte read of the voltage to form a new random seed.
I imagine a resistor from Vcc to a diode connected to 0v. The arduino would read the voltage across the diode.
Has anybody already done this? And did it work?
My machine will not have access to the internet, so it will not be able to lookup random numbers anywhere.