Plastic remote control 53 keys for Strong sat set top box/ Star time set top box / MI set top box
The infrared remote controller is used to generate the remote control coding pulse, drive the infrared transmitting tube to output the infrared remote control signal, and the remote control receiving head is used to amplify, detect, shape and demodulate the remote control coding pulse.
The remote control coding pulse is a group of serial binary codes.
For general infrared remote control systems, this serial code is input to the microcontroller, and its internal CPU decodes the remote control instructions and executes the corresponding remote control functions.
Using the remote controller as the input of the control system, the following key problems need to be solved: how to receive the infrared remote control signal; How to identify infrared remote control signal, design of decoding software and control program
The infrared remote control system is mainly composed of a remote control transmitter, an integrated receiver, a single-chip microcomputer and an interface circuit. Sm0038 has only three pins: vs, GND and one pulse signal output pin out. VCC is connected to the power supply + 5V and filtered by a capacitor to avoid power interference; GND is connected to the ground wire of the system (0V); The pulse signal output is connected to the interrupt input pin of CPU (for example, 13 pin INT1 of 8051). With this connection method, software decoding can work in both query mode and interrupt mode.