ignore that - that was only for older pi's nothing done in the last couple of years needs it
Joel_Mckay wrote: ↑Wed Sep 19, 2018 8:53 amLet us assume you already enabled max_usb_current=1 ...
This site is wrong for 3 reasons:.
1. The 5v header pins do not pass through the poly fuse.
2. While 1.2A for the USB port is fine, that optimistic minimum 400mA core draw should be more like 1.8A with a pi3B+ desktop running wifi. (that is a 3A draw)
3. Most cheap power supplies lie about the output, so de-rate by 40% unless you plan to fry eggs on the inductor or fets..
I have been building embedded devices since 1994, but please educate me if I am missing something.
How about doing this:
the power supply comes via the microUSB, it goes over the polyfuse. Here we have "first" 5v, which is the same as the GPIO expansion pin 2 and 4.
This is correct instead step 3.LTolledo wrote: ↑Wed Sep 19, 2018 9:37 amHow about doing this:
1. Power the Raspberry Pi with its own 5v 2.5A PSU with thick microSUB cable.
2. Power the Arduino with its own PSU (5V 2A perhaps)
3. Connect the USB deviced thru a powered Hub..
Its still up to you to apply the solution....... or continue wondering why you still have undervoltage problem.....
anything else is irrelevant....
1. The GPIO header 5v pins do not pass through a fuse