VirtualWire : http://www.open.com.au/mikem/arduino/VirtualWire.pdf
VirtualWire is an Arduino library that provides features to send short messages, without
addressing, retransmit or acknowledgment, a bit like UDP over wireless, using ASK
(amplitude shift keying). Supports a number of inexpensive radio transmitters and
receivers. All that is required is transmit data, receive data and (for transmitters, optionally) a PTT transmitter enable.
It is intended to be compatible with the RF Monolithics (www.rfm.com) Virtual Wire
protocol, but this has not been tested.
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