Search found 4 matches

by JanickGers85
Mon Sep 14, 2020 4:12 pm
Forum: Hardware
Topic: Read external circuit voltage
Replies: 6
Views: 5304

Re: Read external circuit voltage

I lifted the big yellow capacitor and I've taken a clearer picture of the back.
by JanickGers85
Mon Sep 14, 2020 3:57 pm
Forum: Hardware
Topic: Read external circuit voltage
Replies: 6
Views: 5304

Re: Read external circuit voltage

Here the PCB, front and back, and what I've understood analyzing the circuit. I tried to find "the end" of the rectifier, where the DC voltage is picked up, but without success. Moreover, the IC on the PCB has nothing printed on it so I can't understand how it operate. Basically I would like to know...
by JanickGers85
Sun Sep 13, 2020 10:13 pm
Forum: Hardware
Topic: Read external circuit voltage
Replies: 6
Views: 5304

Re: Read external circuit voltage

Thanks for you reply. It's the first time I work on a project like this, I know a few of electric theory but never done something like that so... :) I like the option of a octocoupler but I don't know how to use it in my context. I've mesured the voltage between anode and cathode and when off is 3.3...
by JanickGers85
Sun Sep 13, 2020 12:04 am
Forum: Hardware
Topic: Read external circuit voltage
Replies: 6
Views: 5304

Read external circuit voltage

Hello there, I would like to read an analog voltage from a circuit that is powered by different AC-DC transformer, different from the 220VAC-3.3VDC that powers my ESP: basically I would like to read the voltage of a led cathode to know if is on or not. If I measure voltage between cathode and GND pi...