The encoding and decoding is based on the HT12E (encoder) and HT12D (decoder) ICs, that allow up to 4-bit data and 8-bit address (allowing up to 256 devices on the same frequency, provided they don’t attempt to transmit at the same time) Transmission They usually cost less than 2 U$D each, and with a good antenna and tuning, they might work with distances of around 50 meters. The radiofrequency section is based on the cheap transmitter/receiver pair WenShing TWS-BS-X, and RWS-X-X which modulate using ASK (more information of the transmitters and the receivers).
These simple circuits can be used for a high number of applications, from RC cars and ships to garage door openers, car alarms, data acquisition, robotics, and others.
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