Connect a button on a BLE 33 to p5js

Arduino code: https://gist.github.com/shfitz/c709a069851b853968675b32f87c7d60 p5js code : https://editor.p5js.org/shfitz/sketches/mS3hL2TIB based in part off from : https://itpnyu.github.io/p5ble-website/docs/read-one-char-callback