Is it possible to stack a Moitessier HAT under or over a PICO UPS on a Raspberry Pi 3?

 

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Questions and Answers › Category: Moitessier HAT › Is it possible to stack a Moitessier HAT under or over a PICO UPS on a Raspberry Pi 3?
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Conk asked 5 years ago

I’m wondering if it is possible to stack a Moitessier HAT under or over a PICO UPS on a Raspberry Pi 3? I’m looking for a UPS/safe shutdown solution for SD card protection. If stacking is not an option, what are people doing for UPS/safe shutdown solutions? Thanks for your insight!

Conk replied 5 years ago

Also researching the PiJuice HAT which has the ability to disable the EEPROM: https://uk.pi-supply.com/products/pijuice-standard

2 Answers
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Thomas Staff answered 5 years ago

Hello Conk,
the Moitessier HAT must be always on top, as the GNSS module with embedded antenna is quite large.
The description of the PICO UPS mentions, that all user GPIOs are accessible. However the HAT uses EEPROM, so it wont work, as only one HAT must use an ID EEPROM.
The PiJuice HAT should work, however there is no guarantee. You must definitely ensure that there is no collision with any GPIO used by either HAT. You’ll find a pinout of the Moitessier HAT in our user guide in chapter 5.1. I’ve compared the pinout with https://github.com/PiSupply/PiJuice/tree/master/Hardware and this seems to be okay.
Regards,
Thomas
 

Hungarpol replied 4 years ago

Hello Thomas, sorry, being mechanical eng. I am ignorant when it comes to digital hardware and protocols… Please explain, could the two HATS share (pijucie+Moitessier) the same GPIOS for I2C? it seems both use 3,5 and 27,28. I have already ordered pijuice, do you think it could damage my Moitessier HAT if assemble and try to run with the pijuice?

Thomas Staff replied 4 years ago

Hello,
I2C shouldn’t be a problem, as this is a bus anyway and several devices share the same pins. However, you must not use devices (sensors, EEPROMs, etc.) using the same I2C addresses.

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Hungarpol answered 4 years ago

I am glad to announce, that It works with PiJuice, GPS is ok, could not check AIS as my current location is pretty much continental.
I have summarized the experiment in this video:
https://youtu.be/faPduQ7omaI

 

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