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There are holes for I2C on the dAISy Hat. I just soldered some pins on it and used those.
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The dAISy HAT is designed to be on top so it makes a bit difficult to connect more stuff. For I2C you have abarrow's solution.
For the GPS module you also have serial1 and serial2 in the HAT but if I am not wrong these connectors are not connected to the Raspberry serial connectors, they are connected to the dAISy HAT MCU. The serial connector UART0 in the Raspberry is occupied by the dAISy HAT so serial1 and serial2 where added to multiplex more serial inputs and to be sent through UART0. I remember having a conversation with the dASIy developer and he said that this options was not completely integrated into the current firmware but you should confirm that because I am not sure.
Another option would be using a USB GPS instead of a module.
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2023-02-22, 07:53 PM
(This post was last modified: 2023-02-22, 07:55 PM by Sailoog.)
If the dAISy input solution does not work you will not be able to use UART0 because it is being used by the HAT but I can see that you have a Raspberry 4 so you can also use UART2, UART3, UART4 or UART5 soldering TX from the module to the right RX GPIO in the HAT. You have to be careful with soldering but it will work for sure.
Let us know what Adrian says please.
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Iam not familiar with multiple UART interfaces but I will check it. Thank you.
I will let you know as soon as I get answer from dAISy developer.