20mA? It should not have to be more than 500 micro-amps. The AVR specs show sample rates of 1,000 samples/sec from input impedance of 10 million ohms. That's sample a current of just under one micro-amp at 5V.
20mA? It should not have to be more than 500 micro-amps. The AVR specs show sample rates of 1,000 samples/sec from input impedance of 10 million ohms. That's sample a current of just under one micro-amp at 5V.