Lab link: https://itp.nyu.edu/physcomp/labs/labs-serial-communication/lab-webserial-output-from-p5-js/

I begin by setting up the breadboard as instructed, and programming the microcontroller with the provided code.

I upload all the provided code to p5.js but it does not work. I examine the Arduino code, the circuit wiring and the p5 code and cannot find out why it is not working.

I cannot move onto the next stages of the lab because I cannot get this output connection to work.