12.4. Summary
Infrared light is a useful means for controlling an appliance when the appliance is in the line of sight. To be effective, infrared light must be modulated by the transmitter with a signature frequency, and this modulation must be removed by the receiver. Fortunately, there are commercial devices that make it easy to meet these requirements. For IR receivers, we introduced infrared detector/demodulators and showed how to use them in simple IR receiver circuits. For IR transmitters, we recommended using universal remotes.
We also described the Linux Infrared Remote Control (LIRC) package as a useful tool for controlling appliances. This package provides device drivers and daemons for measuring and interpreting infrared waveforms, as ...
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