Feasibility of 50 potentiometers

Other Hardware General Electronics
1

Hello. I wasn't sure to post this on the project guidance or here, because it's a mix of the two topics...

I have a project which uses 3 4067 for analog inputs, 24 potentiometers and 8 on-off-on swtiches. And a 4067 for digital inputs. It's working fine. But i want to expand it to:

5 4067, 48 10k potentiometers and 16 on-off-on keys. Is there anything I should worry about? I'm pushing the arduino to the limits? Am i safe :slight_smile: ?

I had problems with the analogreads getting mixed up but fixed it with two consecutive analogreads as suggested.

Also which would be a good power supply to power it? With this set of 24 pots, and 3 74HC595, some normal leds(only 3 HIGH at the same time) with an 16x2 blue backlight lcd display, sometimes I see that the backlight flickers a bit, I read this is because i'm on the limit of the USB current. So, 1A would be good?
I'll try it eventually, but just wondering if it's good, I searched and I didn't find projects with this number of potentiometers.
thanks

2

capicoso:
I'm pushing the arduino to the limits? Am i safe :slight_smile: ?

I think the limit is a lot higher than that.

capicoso:
Also which would be a good power supply to power it? With this set of 24 pots, and 3 74HC595, some normal leds(only 3 HIGH at the same time) with an 16x2 blue backlight lcd display, sometimes I see that the backlight flickers a bit, I read this is because i'm on the limit of the USB current. So, 1A would be good?

A 10k pot should only be using about 0.0005 amps. Even with 60 pots the whole thing shouldn't use more than about 150mA. If you're having problems with current, there's something wrong.

(Hint: You could always try measuring the current...)