I'd be inclined to add a buffer transistor or optoisolator. It would have been nice if the input to the module was an optoisolator, but because you saw a voltage on the pin when it was powered and not connected it probably is not the case.
Here's a compact 4-channel option, you'd need three of them:
https://www.aliexpress.com/item/1005006440590707.html
There is a similar module based on PC817.
Using an optoisolator also allows you to separate the 48V LED supply from the 5V Pico supply. Unless of course you're using a buck regulator to drop 48V to 5V and power everything.
Here's a compact 4-channel option, you'd need three of them:
https://www.aliexpress.com/item/1005006440590707.html
There is a similar module based on PC817.
Using an optoisolator also allows you to separate the 48V LED supply from the 5V Pico supply. Unless of course you're using a buck regulator to drop 48V to 5V and power everything.
Statistics: Posted by ame — Sat Mar 16, 2024 11:07 pm
