I’ve been reading the reference manual of Beaglebone black, and in page 42, it says “The 5VDC rail is connected to the expansion header. It is possible to power the board via the expansion headers from an add-on card.” Can anyone point out which expansion header the manual is referring to and where is it? And is there any difference than supplying power from the barrel jack (eg. max current allowable)?
I am trying to powering up the BBB through the header p9… but when using connecting the 5V to pins 5 and 6 it is still not turning on automatically. I still need to press its power button. So how to make it turn on by just connecting the power?
Hi Gerald… many thanks for your support… I revised the the cape design again and I found my mistake… I was connecting power to pin 7 and 8 as well… it seams like those pins should stay without any volts applied before the device start and supply them with 5V itself.
I'm a little confused on this point. As I understand it, you can supply 5 V regulated to P9, pins 5 & 6, correct? Do I use P9 pins 7 & 8 to supply 5V to an external breadboard? What happens if you supply 5V to pins 5 or 6 if you power the BBB with 5V from the barrel connector or the USB port.
Hello. I’ve found this thread to be quite helpful so far, thank you all.
I have a question regarding where one would connect the “minus” side of my regulated voltage. I have AC → 24 → regulated 5v. I know I would connect positive to P9_5,6, but would I connect the negative of my 5v regulated supply to P9_1,2 (BBB gnd)?