atcw

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

	@echo off
	if NOT EXIST %HOMEDRIVE%%HOMEPATH%\vmshare (
	echo shared vm folder %HOMEDRIVE%%HOMEPATH%\vmshare does not exist
	exit /B
	)
	if NOT EXIST %HOMEDRIVE%%HOMEPATH%\arch.iso (
	echo arch linux iso %HOMEDRIVE%%HOMEPATH%\arch.iso does not exist
	exit /B
	)
	where vboxmanage > nul 2>&1

	# in /etc/systemd/system
	[Unit]
	Description=Bluetooth Agent
	[Service]
	ExecStart=/usr/bin/bt-agent -c NoInputNoOutput
	Type=simple
	[Install]
	WantedBy=multi-user.target

	[Trigger]
	Operation = Upgrade
	Type = Package
	Target = dovecot

	[Action]
	Description = Restart dovecot after upgrade so starting services doesn't fail due to version mismatch
	When = PostTransaction
	Exec = /usr/bin/systemctl restart dovecot

	///$(which true);FLAGS="-g -Wall -Wextra --std=c17 -O1 -fsanitize=address,undefined";THIS_FILE="$(cd "$(dirname "$0")"; pwd -P)/$(basename "$0")";OUT_FILE="/tmp/build-cache/$THIS_FILE";mkdir -p "$(dirname "$OUT_FILE")";test "$THIS_FILE" -ot "$OUT_FILE" \|\| $(which clang \|\| which gcc) $FLAGS "$THIS_FILE" -o "$OUT_FILE" \|\| exit $?;exec bash -c "exec -a \"$0\" \"$OUT_FILE\" $([ $# -eq 0 ] \|\| printf ' "%s"' "$@")"
	#include <stdio.h>

	int main() {
	printf("Hello world!\n");
	return 0;
	}

	package com.acme.condition;

	import org.springframework.boot.autoconfigure.condition.ConditionMessage;
	import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
	import org.springframework.boot.autoconfigure.condition.SpringBootCondition;
	import org.springframework.context.annotation.ConditionContext;
	import org.springframework.context.annotation.Conditional;
	import org.springframework.core.Ordered;
	import org.springframework.core.annotation.Order;
	import org.springframework.core.type.AnnotatedTypeMetadata;

	#!/usr/bin/env python3

	# This hooks script syncs task warrior to the configured task server.
	# The on-exit event is triggered once, after all processing is complete.

	# Make sure hooks are enabled and this hook script is executable.
	# Run `task diag` for diagnostics on the hook.

	import sys
	import json

	#
	# Read from journalctl outputting json and sort the data by program frequency
	#
	# https://blog.kylemanna.com/linux/systemd-journalctl-sort-by-frequency
	#
	# Author: Kyle Manna
	#
	# invocation: journalctl -o json --since "1 month ago" \| jq -s -f systemd-journalctl-sort-by-program-frequency.jq
	#

	function toDegrees (angle) {
	return angle * (180 / Math.PI);
	}

	function myAtan2(y, x) {
	if (x > 0) {
	return toDegrees(Math.atan(y/x));
	}
	else if (x < 0) {
	return (180 + toDegrees(Math.atan(y/x)));