Victor Schröder schrodervictor

ESP32 as Bluetooth Keyboard

With its built-in Bluetooth capabilities, the ESP32 can act as a Bluetooth keyboard. The below code is a minimal example of how to achieve it. It will generate the key strokes for a message whenever a button attached to the ESP32 is pressed.

For the example setup, a momentary button should be connected to pin 2 and to ground. Pin 2 will be configured as an input with pull-up.

In order to receive the message, add the ESP32 as a Bluetooth keyboard of your computer or mobile phone:

Go to your computers/phones settings
Ensure Bluetooth is turned on

Requirements

Encrypt everthing including /boot and /root
Enter password once
Support UEFI

Installation media setup

Download NixOS minimal iso and copy to USB stick. For example on Mac OSX

$ diskutil list
$ diskutil unmountDisk /dev/disk1 # Make sure you got right device

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	* Uncamelize a string, joining the words by separator character.
	*
	* @param {string} text - Text to uncamelize
	* @param {string} [separator='_'] - Word separator
	* @returns {string} Uncamelized text
	*/
	function uncamelize(text, separator) {
	// Assume separator is _ if no one has been provided.
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	import argparse
	from PIL import Image

	parser = argparse.ArgumentParser()
	parser.add_argument("inputfile", help="Path to the image file to convert")
	parser.add_argument("-o", "--output", help="Path to output file with the C array, if not given the same filename as the input is used, with filetype .c", action="store_true")
	parser.add_argument("-p", "--preview", help="Print the resulting image to the terminal", action="store_true")
	parser.add_argument("-d", "--dither", help="Set flag to dither image in conversion from colour to BW, if applicable", action="store_true")
	parser.add_argument("-s", "--small", help="Set flag if your OLED has a resolution of 128x32 instead of 128x64", action="store_true")
	parser.add_argument("-x", "--width", help="Pixel width of your OLED", type=int)