Infrared receiver modules
Infrared receiver modules are commonly used in remote control systems, and sometimes for line-of-sight wireless data transmission.
For the IR receiver module pictured here, which is based on a VS1838B sensor receiving a 38 kHz carrier, we will use a library called IRremote, which includes support for several different modules and protocols.
The module has three pins, labeled `G`, `R`, and `Y`. These letters may (or may not) stand for green, red, and yellow, which happen to be sensible colors to use for the wires connecting ground, voltage, and signal pins, respectively.
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