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ATX powersupply for RPI

Status: Proposal
November 22, 2019 , Latest update: November 22, 2019
The ATX power supply has several voltages on its motherboard connector. 
One of them is 5VSB which is a 5V present when the power supply is under mains voltage.
This 5VSB is used to power the microcontroler.

The role of the microcontroller is :
- to switch on and off the power supply when a push button is pressed.
- to switch off the power supply when the Raspberry Pi goes to power down mode (using a GPIO).
- to monitor the temperature of the RPI's microcontroler and activate a 12V Fan.

The RPI is powered by a µUSB cord and the board gives the opportunity to power an external 2.5" USB drive directly from USB (check my previous article "A Cloud in the Shape of a Raspberry").

This board is built around an ATTINY85.

The code is developped using Arduino libraries but under Eclipse IDE.
For doing this I have written a small utility which creates for you script files to compile the code under Eclipse but this is another subject...
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The ATX-PSU, the controler and the RPI

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