Hi, looking for help with an idea of mine to monitor my PC's 12V rail power quality with a Pi Pico. Probably more on the circuit aspect as i barely remember any EE coursework from school.
For my PC's 12V rail, I want to measure the range of 11v to 13v for ripple, but i'm not sure how to fit that into the Pi Pico's ADC range (0-3.3v).
A thought is to bring the the 12V down to 2V with a, say, 10V zener diode, but I'm a bit uncertain if that's a good idea.
Also have a thought of putting a simple RC circuit as high pass filter to get the AC component (probably like -0.5v to +0.5v), but I'm not sure how to bias that into, say, 1-2v). Also unsure the linearity and what cutoff frequency should I target at.
What might be a better idea here? Thanks.
For my PC's 12V rail, I want to measure the range of 11v to 13v for ripple, but i'm not sure how to fit that into the Pi Pico's ADC range (0-3.3v).
A thought is to bring the the 12V down to 2V with a, say, 10V zener diode, but I'm a bit uncertain if that's a good idea.
Also have a thought of putting a simple RC circuit as high pass filter to get the AC component (probably like -0.5v to +0.5v), but I'm not sure how to bias that into, say, 1-2v). Also unsure the linearity and what cutoff frequency should I target at.
What might be a better idea here? Thanks.
Statistics: Posted by ferrum — Sun Jul 20, 2025 4:21 am — Replies 2 — Views 78