GPIO pins and stacking another card on top of RaZberry card?

Discussions about RaZberry - Z-Wave board for Raspberry computer
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peteh32
Posts: 2
Joined: 14 Sep 2019 05:56

GPIO pins and stacking another card on top of RaZberry card?

Post by peteh32 » 19 Sep 2019 20:01

The other card I would like to stack on top of RaZberry is the Zymbit Zymkey 4i. I was wondering if anyone else has done anything like this, and what your thoughts are?

It seems possible to stack multiple daughter cards on the GPIO pin header, as long as the cards do not conflict in any of the following:
  • No conflicts physically - I plan to add a "stacking header" that has longer pins, so you can stack 2 daughter cards
  • No conflicts electronically on GPIO pins for UART, I2C, SPI, etc
  • No conflicts electronically on GPIO pins for I/O
Based on what I can tell from the RaZberry and the Zymkey, they should not conflict with each other:
  • Zymbit Zymkey:
    • Uses GPIO pins 2,3,4 (physical pins 1,3,5)
    • Does not use GPIO pins 14,15 (physical pins 8,10), which are listed as "NC" for not connected
    • Note: Below image indicates it does not use GPIO pins 14,15 (physical pins 8,10)
  • Z-Way RaZberry:
    • Uses "Serial" (UART), which is GPIO pins 14,15 (physical pins 8,10)
    • RaZberry pinout:
      • Ground
      • VCC (3.3V)
      • "Serial TX", which sounds like UART, GPIO 14
      • "Serial RX", which sounds like UART, GPIO 15

GPIO reference information from https://pinout.xyz
Image


GPIO info on Zymbit Zymkey 4i:
Image
Last edited by peteh32 on 30 Sep 2019 20:29, edited 2 times in total.

peteh32
Posts: 2
Joined: 14 Sep 2019 05:56

Re: GPIO pins and stacking another card on top of RaZberry card?

Post by peteh32 » 19 Sep 2019 20:58

A little more info I found - here is example from Zymbit on how they suggest using a "pie plate" stacking header. Their Zymkey 4i card is on pins 1-10, and the extra long pins allow stacking a 2nd card on the same pins 1-10:

Image

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