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Hi, I have a question.I am trying to use Arduino Uno R3 to build the air monitor and display on computer (no wifi). And I found using the serial.read() and serial.print does not work. Possibly due to computer is using those two ports. Then I switched to 2 digital ports 10 and 11, hoping to using them as RX and TX. Somehow I still get no reading. Do I need the USB to TTL converter? I tried both, connection RX, TX, GND, 5V from SDS021 or the USB to TTL converter, neither worked. Could you please shine light on this? Thanks a lot!
make an arduino wifi air monitor