2021 Jun 23, 07:31 AM
Looking at your boards and after inspecting one of mine I think your good without an extra psu.
If I'm not mistaken your boards have a 1K resistor in series with the leds. That should be R3,R5,R7,R9.... with a value of 102, which means 10 + 2 zeroes, so 1000 Ohm or 1K.
So the real power consumption per channel is about 2mA. This is also what I just measured on my own boards.
The calculation then would be: 32 * 2mA = 64mA when all channels are on. That is of course no problem at all drawing that from the 5v rail of the Pi.
Good luck with connecting everything.
--Gerard
If I'm not mistaken your boards have a 1K resistor in series with the leds. That should be R3,R5,R7,R9.... with a value of 102, which means 10 + 2 zeroes, so 1000 Ohm or 1K.
So the real power consumption per channel is about 2mA. This is also what I just measured on my own boards.
The calculation then would be: 32 * 2mA = 64mA when all channels are on. That is of course no problem at all drawing that from the 5v rail of the Pi.
Good luck with connecting everything.
--Gerard