38 lines
1.4 KiB
Markdown
38 lines
1.4 KiB
Markdown
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# LED Annunciator
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A quick and dirty little device to inform people you are on the phone or in an
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appointment with a traffic light. The state information are generated by a
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groupware or messaging application that writes a single letter code into a file.
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| Command | Meaning |
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|---------|---------------------------|
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| a | Turn on all leds |
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| 0 | Turn off all leds |
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| r | Switch to the red line |
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| g | Switch to the green line |
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| y | Switch to the yellow line |
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AnnunciatorServer takes the code and sends it via serial port to the device.
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Alternatively, similar commands can be send by an infrared remote control.
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## Hardware
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An Arduino Nano with nine leds on pins D02 - D10. The leds are arranged in three
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rows (red, yellow, green) of three leds each.
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A YS1838B infrared receiver is connected to D11 and sits on top facing
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backwards.
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## Software
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### led-annunciator
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The Arduino code.
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### checkLedPins
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A program to check the led/pin mapping by turning them on one by one.
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### annunciatorServer
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The shell script that checks a commandfile and sends single-character
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commands to the serial port.
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This is useful when the commandfile needs to sit on a network share.
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## Room for improvements
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- Sometimes the ir receiver starts to send random codes
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- As all leds are connected individually, many more commands can be defined.
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