Arduino library for automatically sending Morse code signals
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# Telegraph
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Arduino library for automatically sending Morse code signals. Manual control,
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speed adjustments, and use of active-on-low relays are supported.
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## Usage
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Check the example sketches, especially
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[`Telegraph_Demo`](https://git.kj7rrv.com/kj7rrv/Telegraph/src/branch/main/examples/Telegraph_Demo/Telegraph_Demo.ino),
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for more information.
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## Setup
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To create a `Telegraph` object, use the code:
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Telegraph telegraphName(pinNumber, speedInWordsPerMinute, HIGH);
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(Use `LOW` instead of `HIGH` for an active-on-low relay. If you're using a
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relay and aren't sure whether it's active-on-low or not, just try it with
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`HIGH`; if your relay is active-on-low, keying will be opposite of what is
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expected.)
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## Sending messages
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To send a message in Morse code, run this:
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telegraphName.send("MESSAGE");
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The following characters can be used in messages:
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ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890.,?'!/()&:;=+-_"$@
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Lowercase letters are supported. Unsupported characters will not be
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transmitted, but may cause gaps in timing.
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## Adjusting speed
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To change the transmission speed after creating the `Telegraph`, run:
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telegraphName.wpm = 25;
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## Manual control
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To manually turn the pin on and off, just use these commands:
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telegraphName.on();
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telegraphName.off();
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