Infrasonic hardware

When you try to upload a new sketch to your ESP32 and it fails to connect to your board, it means that your ESP32 is not in flashing/uploading mode. Having the right board name and COM por selected, follow these steps:

• Hold-down the “BOOT” button in your ESP32 board
• Press the “Upload” button in the Arduino IDE to upload a new sketch
• After you see the “Connecting….” message in your Arduino IDE, release the finger from the “BOOT” button

If you are using a new ESP32 and planning to use internal flash for storage, then you need to format it once. You can comment it for the second upload onwards.

`#define FILESYSTEM SPIFFS
// You only need to format the filesystem once
#define FORMAT_FILESYSTEM false

to

`#define FILESYSTEM SPIFFS
// You only need to format the filesystem once
#define FORMAT_FILESYSTEM true

AND

//Unless its inrernal flash, we dont have to 
  //format here. For example SD cards can be
  //formatted using a computer format
  //if (FORMAT_FILESYSTEM) FILESYSTEM.format();

to

  if (FORMAT_FILESYSTEM) FILESYSTEM.format();