Standard set for Arduino kits consists of simple remote and a small module with IR receiver (basically just TSOP38238 IR sensor + LED and resistor).
The connection and first steps of decoding the signal is based on Ken Shirriff’s blog and his IRemote library. The library is available at Github
See also how decoded key number can be displayed on LED display, and please note, that green LED on the picture is not used in the code below. Continue reading IR Remote