Related to my twinkling LED post, according to the specs for the WS2812 LEDs I’m using, if I want to power more than 5 of them (I’m going to need at least 20), I need an external power source from that of the Ardunio.
A quick google search on how to achieve this lead me to learn of the Breadboard Power Supply Module, which then solved another mystery - the purpose of one of the strange devices which I got with my Raspberry Pi starter kit (it was a BPS).
Anyway, so I have a BPS, and I’m eager to have a play with it, but I’m a little concerned about the readings my multimeter is getting off it.
If I understand correctly, I’ve got the ability to choose between 5v and 3.3v based on the location of the jumper pins, so I set about experimenting:
I set the jumper to the 3.3v position and took a measurement of
3.29 V- perfect
I then set it to the off position and took another measurement, this time it was
0.8 mV(which I guess is as close to off as it needs to be)
So finally set it to the 5v position and took my final reading:
Either I’m reading this wrong, the multimeter is broken, or the BPS is sending too much voltage when the 5v jumper is set.
So I’m really confused by this, and a little scared to go any further because I don’t want to blow my new RGB LEDs.
There is one further piece of information which might help unravel this - I’m using a 12v power supply which I’ve salvaged from an old router to power the BPS. The plug itself has the following info on it:
Am I using the wrong sort of power supply?