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According to RPi 4 overlays readme you have to turn off Bluetooth to use UART0. You should test alternative UART pins. Name: disable-bt Info: Disable onboard Bluetooth on Pi 3B, 3B+, 3A+, 4B and Zero W, restoring UART0/ttyAMA0 over GPIOs 14 & 15. N.B. To disable the systemd service that initialises the modem so it doesn't use the UART, ...


You can make a wifi connection between them by making one a hotspot and another a user. Or you can use a bluetooth too.


The easiest way without overthinking it too much, would be to just set up one of the RasPis as an access point that the others connect to. Make your robotic car it's own WLAN. If you prefer a wired connection, simple communication can work over a basic serial UART. If you have a lot of streamed data, SPI may be a possibility as well. Lastly, you can add ...


i bought the EW-7611ULB wifi & bluetooth dongle. but bluetooth fails to work on my Ubuntu 16.04. i just modified the "EW-7611ULB_Linux_Bluetooth_Driver_1.0.0.9" bluetooth driver to work on my Ubuntu 16.04.02 LTS with the following kernel version - Linux xxx 4.16.0 #1 SMP Wed Sep 5 18:09:34 CST 2018 x86_64 x86_64 x86_64 GNU/Linux I did not do any fine ...

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