In SX Microcontrollers, SX/B Compiler and SX-Key Tool, g_daubach wrote:

I once was thinking of something similar: Having a radio receiver in the car, and a hand-held transmitter with you. In case you can't find your car, activate the hand-held transmitter. The receiver in the car will receive a certain signal in this case and it will activate a horn, a siren, or something else to give you an acoustic feedback. To make sure that the receiver is not triggered by false signals, it is important that the RF (radio frequency) signal is modulated by some unique ID code. So, it may be possible to use SXes for generating and decoding such ID code but this is a different story.

You first need a matching set of transmitter/receiver operating in a frequency range that is free to be used for such remote-control systems in your country. As a beginner, I would not try to build the transmitter and the receiver by myself. Instead, I would buy a set of off-the-shelf units.

Important is that the transmitter can be modulated and the receiver has a demodulated output (both digital, if possible). Also check for the maximum possible range between transmitter and receiver for a good operation, and keep in mind that concrete walls and floors usually found in garages can reduce this range dramatically, depending on the transmit frequency.

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