Ryde remote controls
The Ryde DATV receiver is designed to work with an Infrared remote control handset.
A Infrared sensor is needed on the receiver and can be one salvaged from an old consumer electronic part or purchased new - typical example is https://uk.farnell.com/vishay/tsop2438/ir-receiver-45m-0-12mw-m2-side/dp/4913097
These sensors are 3 legged devices with +ve, gnd and output which is connected directly to pin x of the RPi GPIO port.
Older devices may need to be used on a +5v supply and must be fitted with a resistor to ground on the high impedance output to reduce the voltage to 3.3v for the Rpi GPIO port.
Connect 5v to the device and use an oscilloscope to measure the voltage on the output - connect a 47K resistor to ground and check the level drops to 3.3v - if not adjust the resistor value to suit.