I'm using IDE 1.8.13 on my pi.
I have two LORA ESP32 boards plugged into the pi via usb, can't be unplugging them as they are dependant on the pi for power.
I want to check how they are performing so I thought i could just read the output from each one via the serial monitor.
I can see one on /dev/ttyACMO, but when i switch the port to either /dev/ttyS0 or /dev/ttyAMA0 there is no output in the serial monitor.
I understand that I will only be able to see one at a time, but how do i get to see the other one?
do not use the IDE's Serial monitor
coolTerm or the unix screen command could be options to consider
That is not actually true. If you start 2 instances of the IDE rather than staring one and doing File/New, then each instance can be associated with a different Serial port
Thankyou, @J-M-L but, with respect, that doesn't answer my question, just refers me to a piece of software that isn't really intended for user on a rasp pi.
I tried this, and starting the second instance caused the pi to crash, it's also running node-red and rtl_433 so I guess I overloaded it!
Hi @mczakk
Does the program running on the ESP32 boards print anything to the serial port? Although it is common to add such output to a sketch, especially for debugging purposes during development, you can't assume that every sketch produces output. In fact, it can in some cases it will be beneficial for the sketch developer to disable (or remove altogether) the code for unnecessary output before putting a program into production use so that it doesn't consume resources.
As far as Serial Monitor goes, you simply select the port of the board you want to connect the monitor to from the Tools > Port menu in Arduino IDE.
You should check whether the selected port is actually the ESP32 board. All serial ports on your computer are listed in the Tools > Port menu; regardless of whether they are Arduino boards. It is common for there to be some unrelated ports in the menu. This can be especially confusing if the Arduino board is not producing a serial port for some reason (e.g., power-only USB cable, interference from BRLTTY).
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