This page (revision-23) was last changed on 2022-03-22 20:37 by Murray Altheim

This page was created on 2019-12-23 02:09 by unknown

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Raspberry Pi
RaspberryPi

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! Power Supply
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I'd say a sizeable majority of problems people have with Raspberry Pis are related to power supply. It's almost unfortunate that it ''can'' be powered by USB since that gives people the impression that plugging a Pi (often including additional peripherals) into a USB port, a USB power bank, etc. should just work. The Pi actually is meant to run at 5.1 volts, not 5.0 volts, and will stop operating and reset itself around 4.85v. So at 5 volts the Pi is already working under its optimal voltage, and not all USB power sources even provide 5 volts (some lower, some dangerously higher — fast chargers at 7 volts will immediately smoke test your Pi). Power supply voltages typically brown out (drop) under load, so pushing the power supply with a display, WiFi, a fan, etc. often leads to problems.
In terms of choosing a power supply it's good to overspecify by maybe 20% as you'll want a buffer. E.g., a *bare* Pi 4 B requires 3 amps (15 watts), a bare Pi 3 B+ 2.5A Overclocking would increase the requirement. Additional peripherals would also add to that value. You'll sometimes see "idle" power specified but that's rather useless for specifying power supplies unless your Pi will never do more than idle.
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* [Raspberry Pi® User Guide|https://dn.odroid.com/IoT/other_doc.pdf], posted by Odroid
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* [Make a Raspberry Pi 4 program start on boot|https://roboticsbackend.com/make-a-raspberry-pi-3-program-start-on-boot/], from ''[The Robotics Back-End|https://roboticsbackend.com/]''
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* [Using the Raspberry Pi Timer for Embedded Environments|https://www.studica.com/blog/raspberry-pi-timer-embedded-environments], basically writing assembly code to use the Pi's hardware timer
* [New Pi Zero Gains Unapproved Antennas Yet Again|https://hackaday.com/2021/12/13/new-pi-zero-gains-unapproved-antennas-yet-again/] on Hackaday
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This page (revision-23) was last changed on 2022-03-22 20:37 by Murray AltheimTop