For classic 38KHz infrared remote signal reading, we've got a lovely STEMMA IR Receiver. But if you want to read infrared signals from remotes with different carrier signals, especially when you don't know the frequency, this Adafruit TSMP96000 "Code Learning" Infrared IR Receiver Breakout has the ability to detect IR signals from 20 to 60KHz and provide the carrier signal for analysis. This is used for "code learning" situations where you want your device to work with any IR remote control. Usage is simple: Power the board by connecting V+ and ground to 3~5VDC, point a 20~60KHz IR remote control at the sensors, and press some buttons. The modulated IR signal, with the carrier signal intact, is piped out the Signal pin into your microcontroller which will then need to decode it. To make usage really easy, we have a green 'power good' LED and a red 'signal' LED. When IR remote signals are read by the onboard sensors, the red LED will blink to let you know.