When you are satisfied with the code you've written and whatever it does? Another step or final step after flashigng the code? It does exactly what I want after it starts running on my ESP-32, then I turn it off and I get this error while using battery power. But it has more to do with loosing that first state before it gets disconnected.
here's the error
Board at /dev/cu.SLAB_USBtoUART is not available
I get it when Arduoino IDE is open and I try to go to the serial monitor. Also that board is no longer an option in boards....
here the MIDI
Any help would be much appreciated!