Adapter for morse keys to USB
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:Author: neale
:Date: 2020-May-3
:Revision: 1
:License: MIT

= Project: USB Morse Adapter

This translates Morse key inputs into USB events,
either MIDI or MIDI+Keyboard,
so you can use a computer.

I use this with an Internet morse code repeater I wrote,
available at

This project requires an Arduino that can send USB.
I've only used the Micro,
although I have no doubt the Leonardo will work too,
as I've used Leonardos for similar projects.

== Step 1: Installation

This needs the MidiUSB and Keyboard libraries.

Installing those is documented all over the Internet.
I'm using so this is all magic for me.

== Step 2: Assmble the circuit

Morse code keyers are very simple devices, 
they just connect two wires together.
You could use a button if you wanted to,
or even touch wires together.

The only real complication here is that some browsers
need to get keyboard events instead of musical instrument events.

=== Decide what browser you're going to use

Firefox needs a jumper between pin 9 and ground.
Just take a wire, and connect pin 9 directly to ground.
This puts the Arduino into "keyboard mode",
where it sends a comma for straight key,
and period and slash for iambic.

If you don't connect pin 9 to ground,
the Arudino only sends MIDI (Musical Instrument Digital Interface)
events, so it looks like you hooked a piano up.
This works great in Chrome,
and lets you switch to other windows while still keying into vail.

=== Wire up your input device

Hook a straight key into ground on one side,
pin 10 on the other.
It's okay to leave pin 10 disconnected if you don't have a straight key.

Hook an iambic paddle in ground in the middle,
pins 11 and 12 on the outside posts.
It's okay to leave pins 11 and 12 disconnected if you don't have a paddle.

=== Using a headphone jack

If you prefer, you can wire a headphone jack up to GND, 11, and 12.
GND should be the sleeve, 11 the ring, and 12 the tip.

   o  --- 12
  |_| --- 11
  | | --- GND
  | |

Make sure any straight key you plug in has a TS adapter (mono plug):
this will short pin 11 to ground and signal to the Arduino to 
go into straight key mode.

You need to reset the Arduino if you change from an iambic to straight key.
On the micro, reset is a white button.

If you plug in your straight key and it looks like DAH is being held down,
it means you need to switch the connections to pins 11 and 12.

If you plug in your straight key and it looks like DIT is being held down,
it means you need to reset the Arduino to make it detect the key type again.

== Step 3: Load the code

Upload the code contained in this sketch on to your board.

== Step 4: Test it out

Make sure it's plugged in to your computer's USB port.

If you connected pin 9 to ground,
Open anything where you can type,
type in "hello", and hit the straight key.
You should see a comma after your hello.

Now you can open,
click the "KEY" button once to let the browser know it's okay to make sound,
and you should be able to wail away on your new USB keyer.

=== License

This project is released under an MIT License.

Copyright © 2020 Neale Pickett
Copyright © 2013 thomasfredericks

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

The software is provided "as is", without warranty of any kind, express or
implied, including but not limited to the warranties of merchantability, fitness
for a particular purpose, and noninfringement. In no event shall the authors or
copyright holders be liable for any claim, damages, or other liability, whether
in an action of contract, tort or otherwise, arising from, out of, or in
connection with the software or the use or other dealings in the software.

=== Contributing
To contribute to this project please contact

=== BOM

In addition to a key, some hookup wires, and a USB cable,
you only need an Arduino.

| ID | Part name      | Part number | Quantity
| A1 | Arduino Micro  | ABX00053    | 1

=== Help

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