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GY-MCU90640 modules I have seen had a default baudrate of 115200, not 9600. Since your symptoms look exactly like baudrate mismatch, this is the first thing I would try to rectify. Note that GY-MCU90640 also has an I2C interface which is much faster (around 400000 instead of 115200) and doesn't have any configuration options you can get wrong as the UART ...


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When I see strange characters like this I immediately think about the serial setup. I would play around with the combination of baud rate, parity, byte size and stop bits until I got readable text coming back. I note that the default baud rate (see image 1) for the device is 115200 and it seems they are proposing 8 bit word, no stop bit and no parity. Try ...


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The documentation does hint that there are various problems/shortcomings with the mini-UART but it still did not explain why it was screwing up. I finally found the reference that helped to explain the behavior. The key was finally reading section 2.2 of the BCM2835 ARM Peripherals documents, link found on the RPi site. This section describes the mini-UART ...


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