Signals and controls
Infrared remote control
Reuse an old remote as a low-cost set of wireless buttons.
What it does
A remote emits a sequence of modulated light pulses containing a protocol, address, and command. Holding a key may send repeat frames.
Connections and compatibility
It needs a working battery and a matching receiver. Bluetooth or radio remotes cannot be read by an infrared receiver.
Choosing one
Reuse an unused TV or starter-kit remote. Record the codes that your actual unit sends rather than assuming a printed keypad has standard codes.
Common mistakes
Command codes vary between products. An infrared command is not authentication for a lock or other security boundary.
Use it in a tutorial
- Infrared receiver modules — Decode an old remote with a 38 kHz receiver and distinguish new presses from held-key repeats.