Working principle of infrared optical fiber: infrared remote control has two parts: sending and receiving. At the sending end, the binary signal to be sent is coded and modulated into a series of pulse train signals by using a single chip microcomputer, and the infrared signal is emitted through an infrared emission tube. Infrared reception completes the reception, amplification, detection and shaping of infrared signals, and demodulates remote control coded pulses.

In order to reduce interference, an integrated infrared receiver (HS0038, receiving infrared signals with a frequency of 38kHz and a period of about 26μs) is used to receive infrared signals. At the same time, the signal is amplified, detected and shaped to obtain TTL-level coded signals, which are then sent to the single chip microcomputer, which decodes and executes them to control related objects.

The infrared transmission part consists of 5 1 single chip microcomputer, keyboard, infrared light emitting diode and 7-segment digital tube. Keyboard is used to input instructions, 5 1 single chip microcomputer detects the state of keys on the keyboard and modulates infrared signals, LED generates infrared rays, and digital tube is used to display the sent key values.

The infrared receiver consists of 5 1 single chip microcomputer, integrated infrared receiver HS0038 and 7-segment digital tube. 5 1 MCU detects HS0038, decodes the data received by HS0038, and displays the received key values through the digital tube.