Hello,
I am wondering what the highest recommended input impedance is when reading with the analog pins. I am planning to measure the voltage from 4xAA batteries with two 10K and one 2.2K to divide the voltage from 6V down to 3.3V. I'd like to scale up the resistors to say two 100K and one 22K (to reduce power loss), but I'm not sure the additional impedance wouldn't mess with the analog read.
And then if the impedance is too high- could I just cheat by adding a delay for the analog caps to charge before reading?
Thanks,
Xav
I am wondering what the highest recommended input impedance is when reading with the analog pins. I am planning to measure the voltage from 4xAA batteries with two 10K and one 2.2K to divide the voltage from 6V down to 3.3V. I'd like to scale up the resistors to say two 100K and one 22K (to reduce power loss), but I'm not sure the additional impedance wouldn't mess with the analog read.
And then if the impedance is too high- could I just cheat by adding a delay for the analog caps to charge before reading?
Thanks,
Xav