Can I change analogRead settling time on UNO R4 WIFI?

Projects Programming
1

I am having trouble reading analog input signals using an Arduino UNO R4 WIFI. Because of hardware constraints on my system, I need to use a fairly high impedance voltage divider (100k / 120k) to drop the voltage below 5V. I am getting inaccurate readings that I think are due to inadequate time allowed to let the voltage settle when switching from channel to channel.

Is there a way to change the timing? I would be ok with my system running a bit slower.

(I have seen a discussion here on changing the "prescaler" for the timing of analog input measurements, but I am not sure it applies to the UNO R4 WIFI.)

2

If you need to allow more time between readings why not take the readings less frequently ?

3

If your signals don't change very quickly, a 0.1uF cap across each analog input pin to ground might do the trick.

4

The cap is a great idea - makes perfect sense, since my signals do not change quickly. I happened to have a couple of .01 uF caps laying around. They do the job, and I they shouldn't have any effect on the system I am measuring.

Thanks for your help.