McArthur 1.2 at PI 5 not powering up

[vkue]

Hello,

I followed this guide to wire my MacArthur 1.2 on a Raspberry 5.

https://macarthur-hat-documentation.read...power.html

I did not add a switch as shown but connected directly 12 V to the Power Source and the 12V SW
I have a switch between the Battery and the Arthur HAT.

When I switch on RED Leds on the MacArthur Hat switch on for 12 and 5 V, The raspberry is not powered

The connectors are pretty thin, is the any special requirement on the Battery ?
If not any explanation why the Raspberry should not power on ?
To test the PI can I switch of the 12V and power the PI with an USB Power Cord to make sure the device still works ?

Thanks in advance for any hint ion that.

[Adrian]

The 12V/GND wires should be able to comfortably carry 2A. So not a huge requirement, but more than some flimsy jumper wires from AliExpress

I'd double-check that the MacArthur HAT is properly seated. You can also use a volt meter to check that there's 5V on pin 2 of the 40-pin header. Be careful to not short with neighboring pins when measuring!
https://pinout.xyz/

You can also check whether the Pi powers on from USB while the MacArthur HAT is mounted. And without the HAT if that fails.

If the Pi seems to briefly power on, but then immediately shuts down, your issue may be with the configuration of automatic shutdown, or the pins that carry the shutdown signal between the HAT and Pi.

[vkue]

Thanks Adrian,

it took me time to find a decend power supply. 

Actually I have also the additiona Step Down Voltage regulator installed.
I can measure on the Power source and the SW the expected 12V
On the Step down Pin Out 3 Volt.

But on the Pi 5 on Pin 2 there is no voltage.

Is there some jumper I have to switch for the power from the McArthurHat to the PI5 ?

What did you mean with the automatic shutdown configuration ?

[Adrian]

Can you share a picture of your setup, and where you measured?

The OUT pin of the step-down should be 5V, and that voltage should also be present on Pin 2 of the Pi when the power module is enabled. 3V is definitely too low and would indicate that either the power module is bad. Or that the Pi has a short to ground on its 5V rail, i.e. is dead.

---

The power module is turned on when 12V SW is connected to 12V.

Shutdown configuration as documented here:
https://macarthur-hat-documentation.read...figuration
But don't go there yet if you Pi doesn't even power up.

[vkue]

Sorry 5V on the Out Pin of the StepDown. To Clarify the picture

   

[Adrian]

Uh.. that MacArthur HAT is mounted upside-down. 

The HAT will probably be fine, but the Pi may have been damaged with the 5V going into GPIO pins 38 and 40 (which are used for Shutdown and Seatalk).

[vkue]

Uh.. that MacArthur HAT is mounted upside-down. 

The HAT will probably be fine, but the Pi may have been damaged with the 5V going into GPIO pins 38 and 40 (which are used for Shutdown and Seatalk).

oh s..t, you mean the green exits should look in the other direction and what is seen should look down/ mounted extension up ?

[Adrian]

Uh.. that MacArthur HAT is mounted upside-down. 

The HAT will probably be fine, but the Pi may have been damaged with the 5V going into GPIO pins 38 and 40 (which are used for Shutdown and Seatalk).

oh s..t, you mean the green exits should look in the other direction and what is seen should look down/ mounted extension up ?

   

[vkue]

Thanks a lot for your help !

Doing it right, it works :-)
Powering Pi5 and screen..booting now into OpenPlotter first time