Goal
In this short article we'll power the RPi with the PS1 power supply.
Powering the RPi with an USB cable is ugly and defeats the purpose of a fully integrated system.
In this short article we'll power the RPi with the PS1 power supply.
Powering the RPi with an USB cable is ugly and defeats the purpose of a fully integrated system.
Stepping down from 8V
Unfortunately the supply only provides 3.5V and 8V.
We thus need to lower the voltage from 8V.
For this I use an LM2596 converter.
Unfortunately the supply only provides 3.5V and 8V.
We thus need to lower the voltage from 8V.
For this I use an LM2596 converter.
The principle is fairly simple:
- PS1 power supply GND goes in IN-
- PS1 power supply +8V goes in IN+
- RPi GND goes to OUT-
- RPi +5V goes to OUT+
LM2596 converter
Left: IN = PS1
Right: OUT = RPi
PS1 power supply: GND and +8V to connector
(Don't mind the 4 red and orange cables at the left)
Adjust OUT+
Before connecting the RPi, you must adjust the output voltage for it to be +5V (±5%).
This is easy: connect the +8V input to the PS1 power supply and put a voltmeter on the output.
Then turn the pot on the converter until the voltmeter shows +5V.
Power the RPi
The Pi can be powered through GPIOs, so OUT+ goes to the +5V GPIO (top right) and OUT- to one of the GND pins.
Everything should work now.
Sources
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