PC remote control circuit

The basic principle of the circuit is to collect infrared signals through the infrared receiver. When an infrared signal comes in, the microcontroller AT89C2051 software executes an interrupt and decodes the collected infrared signals, and sends them to the PC from the serial port. The PC software Girder receives the infrared signal from the serial port. characters and then make corresponding command operations according to the definition (for the basic usage of Girder, please see <Building a Super PC Remote Control>). A few simple components are used in the circuit to make a serial port power stealing circuit, so that the remote control does not need an external power supply and can be used just by plugging it into the serial port. It can be said to be plug and play :). After installation, after running Girder, the indicator LED1 will start flashing, indicating that the circuit is working normally. You can use your remote control at this time. When Girder is turned off, the power to the circuit board will be cut off and the indicator light will go out. The picture below is the complete electrical schematic diagram of this remote control receiver: