[email protected] said: > Do you trust your power? The Pi 3 is even more picky than the Pi 2.
Thanks. That could be the problem. Meter says 4.8V. I didn't get out a scope to look for dips below that. [email protected] said: > Everyone should have a USB V/A meter, they are cheap. Here is one for $6: Beware. Inserting a current meter will actually drop the voltage you get. You should probably get a real meter to see if the USB meter is showing the high side or low side of the current measuring resistor. [email protected] said: > The Pi people say 2 amps is not good enough, they recommend 2.5A. That depends upon the stuff you plug into your Pi. With a regulated supply, it doesn't help to have one with a higher current rating. It might run cooler. In theory, each USB port can ask for 500 mA. I don't know how much the Pi will give out. Then you can plug in a HAT... Adafruit says their wall wart style power supplies targeted at the Pi actually set the output voltage at 5.25 to give a little more room after the end of the cable. > I have a USB Volt/Amp meter on my Pi3, never seen it pull more than 700 mA > while compiling a kernel, and running gpsd, ntpd and the GR-601W. > 28AWG is 0.064 ohms per foot. Double that for out and back to 0.128 ohms/ft > of USB cable. 0.128 * 3 * 0.7 is 0.268 V. So if you start with 5V, you will be under 4.8. Adafruit also has 6 inch cables. :) -- These are my opinions. I hate spam. _______________________________________________ devel mailing list [email protected] http://lists.ntpsec.org/mailman/listinfo/devel
