Arduino + NRF24 based walkie talkie for use in workshops and sound-modem applications. Features: moderate range (400m), mini-jack input/output, serial input/output, push to talk button, clipping indicator, removable antenna, removable mic, switch for speaker output, 9 volt battery power, USB power and optional 3.3v regulator.

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How-to, kits, board files soon.
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Sound-modem usage example:
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