Hi Jeff (@JeffNickel ),
Welcome!
With Postcard running our RTK Everywhere Firmware, you have multiple options:
- LG290P UART1 is connected to the CH342 USB interface chip on its channel B. Install the CH342 drivers, connect USB, select the CH342 B COM port, open a terminal at 460800 baud to see the messages
- LG290P UART3 is connected to the 4-pin JST connector. You can connect an external 3.3V “FTDI” USB-UART cable or converter to access the messages. Again, at a default of 460800 baud
- CH342 channel A is connected to the ESP32, and the ESP32 is connected to LG290P UART2. You can configure the RTK Everywhere Firmware to passthrough the UART data from the LG290P to the CH342 channel A
The LG290P is connected to the Qwiic bus, but its firmware does not currently support I2C. Quectel may add support in a future update. SPI is not supported.
I hope this helps,
Paul