You can also find online help and disussion at Please use that group for all questions and discussions on this topic. The version of the package that this documentation refers to can be downloaded from You can find the latest version at VirtualWire: unaddressed, unreliable messagesĮxample Arduino programs are included to show the main modes of use.They work a bit with ASK wireless, but not as well as this code. Why not just use a UART connected directly to the transmitter/receiver? As discussed in the RFM documentation, ASK receivers require a burst of training pulses to synchronize the transmitter and receiver, and also requires good balance between 0s and 1s in the message stream in order to maintain the DC balance of the message. Messages are sent with 4-to-6 bit encoding for good DC balance, and a CRC checksum for message integrity. Messages are sent with a training preamble, message length and checksum. It is intended to be compatible with the RF Monolithics (Virtual Wire protocol, but this has not been tested.ĭoes not use the Arduino UART. Can also be used over various analog connections (not just a data radio), such as the audio channel of an A/V sender All that is required is transmit data, receive data and (for transmitters, optionally) a PTT transmitter enable. Supports a number of inexpensive radio transmitters and receivers.
VirtualWire is an library for Arduino, Maple and others that provides features to send short messages, without addressing, retransmit or acknowledgment, a bit like UDP over wireless, using ASK (amplitude shift keying).
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