Can the Arduino UNO R3 read PCBs?

Projects General Guidance
1

I'm working on some project with a device I disassembled (to be more precise, a calculator) and need to read voltage from
on its PCB (and, if possible, send current to it). I want to start off saying I cannot read boards, but I do have knowledge about electronics and tech in general. The device has contacts that, when connected to an oscilloscope, emit a short high spike when a button is pressed.
The device's power rating is 1.5 volts, and is powered by AAA. and I wonder if the Arduino can read such low voltage.
If you need more info, please let me know!
Thank you for your help!

The board:

a device I disassembled
a device I disassembled1694×3418 421 KB

(example contact: )

contacts
contacts1920×1963 175 KB

2

An analog input on an R3 can read as little as about 5mV under ideal conditions, if memory serves. What's the duration and amplitude of the signal you want to read.

3

Hi,

Sorry for the long, LONG wait, I tried to get a hold of an oscilloscope to measure the signal (hopefully getting one in the next 2 to 3 weeks), because the info I got was from someone with the same PCB as me, on a forum.

I only know the signal is pretty short, besides that I don't have any more info. Will keep you updated though.

4

hello @blestlace
Do you need to know the actual voltage or just that a pulse occured.

5

No, I only need to know if a pulse occured.

6

Then you can use the Uno Analog comparator to detect when the pulse happens.

7

Still need help?

8

Hi, I tried to respond but it didn't work. Hope this time you get to see my message!

I am currently away from home, so I cannot test your suggestion. I will update you once I'm able to try stuff on my Arduino.

9

Hey Jim,
To be honest, I don't understand how to make the analog comparator work, during my research I got even more confused. Could you explain it a bit further?

10

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