Ultimate GPS logger sheild layout error

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ve6vh
 
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Joined: Mon Feb 10, 2025 7:24 pm

Ultimate GPS logger sheild layout error

Post by ve6vh »

Hi,
On the Ultimate GPS shield layout for Tx/Rx on D0 and D1, the pins are reversed. The Tx data is connected, via the slide switch to D1, and the Rx to D0. The Arduino standard shows Tx on 1, and Rx on 0, which means that Tx is connected to Tx, and Rx to Rx. To get it to work correctly, I had to switch them so that Tx-Rx and Rx-Tx. Attached is a snapshot of the slide switch schematic and Arduino pinout.
To verify it I researched the Arduino R4 WiFi Schematic, and it shows that D0/D1 are connected to the CPU on pins 31 (P301) and 30 (P302) respectively, and the R7FA4M1AB3CFM#AA0 datasheet shows them as RXD2 and TXD2, so that would not work correctly either.
QED.

PS: Apart from that, it is a very nice GPS receiver! Good sensitivity and fast position fix.
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AdaFruit layout.png
AdaFruit layout.png (12.63 KiB) Viewed 12 times

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adafruit_support_carter
 
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Joined: Tue Nov 29, 2016 2:45 pm

Re: Ultimate GPS logger sheild layout error

Post by adafruit_support_carter »

I think this is all explained here?
https://learn.adafruit.com/adafruit-ult ... al-connect

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