1003 Arduino Chapter 10 adding ascii keyboard commands

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Hello Jason. I have enjoyed working through your videos, you do an exceptional job of explaining and building on past learning.
I use a Raspberry Pi to work with my Arduino Mega 2560. I installed Processing 4.3 (ARM) 0nto the Raspberry Pi but I am having issues communication with the Arduino, I keep getting the following error message 'Error opening serial port /dev/serial1: Port Busy'. I am a bit confused as the Arduino is connected via the USB port, not the serial connections on the Raspberry Pi. Any suggestions on how to address this?

adrianrawlings
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hi, i would like to press ü button my keyboard, ascii char 252 is that possible?

themanthis