How to start the device while back-powering via GPIO?

Hello,

I’ve a Raspberry Pi 4 with a dual SATA HAT, and I’ve a 12V/5A DC jack 5.5x5.2 mm PSU. I think I’ve assembled the system correctly, but “nothing happens”. (I haven’t actually tested the PSU, but I’ve tested the rpi board, it boots from SD correctly.)

Could someone point me to the right direction on how to proceed in this situation?

Thank you for your help in advance!

Hello, what do you mean “nothing happened”?

Did you install the software that comes along with the hat? See the wiki pages.

Also: You need to power the RPi and the HAT from the barrel socket/USB-C on the HAT, not via any other GPIO work-around.

Thanks for the fast replies!

Literally, I plugged in the barrel jack into the barrel socket on the HAT, and none of the LEDs blinked, the connected HDDs did not started spinning, the rPi’s RJ45 port did not start blinking either. I listened to the PSU too, but there was none of the usual high-frequency buzz either.

I did not install any software yet. (Just a stock Raspbian.)

You need to power the RPi and the HAT from the barrel socket/USB-C on the HAT, not via any other GPIO work-around.

I’m trying to :slight_smile: The SATA HAT connects through the 40-pin GPIO header, right?

Barrel socket is the way to go.
Plug-in your power supply with the hat removed from your RPI and without any disks. At least the PS led should come on. If not first look at your Power supply, and make sure it works ok.
If that’s ok: power the hat with disks only inserted, Start with 2, then 3 or 4
What disks are you using? And what are their power supply ratings?

If all that is ok and your RPI boots: install the software. It is needed for the sata chip(s) to be enabled and thus make the disks come alive.