Principle of industrial remote control

There are already many remote controllers on the market, such as automobiles, electric devices, etc. Compared with infrared remote controllers: industrial remote controllers are easy to make, and the remote control distance is long. powerful! Low bit error rate, safe and reliable, loved by the majority of electronic enthusiasts!
1. Introduction of remote control chip
PT2262/PT2272 is a low-power and low-cost general-purpose codec circuit manufactured by CMOS technology produced by Taiwan Pucheng Company. PT2262/PT2272 can have 12-bit (A0-A11) tri-state address pins (floating, Connect to high level, connect to low level), any combination can provide 531441 address code, PT2262 can have 6-bit (D0-D5) data terminal pins, the set address code and data code are serially output from pin 17 , can be used for wireless remote control transmitter circuit.
The coding signal sent by the coding chip PT2262 is composed of address code, data code, and synchronization code to form a complete code word. After the decoding chip PT2272 receives the signal, the VT pin outputs a high level after the address code is compared and checked twice. At the same time, the corresponding data pin also outputs a high level. If the transmitter keeps pressing the button, the encoding chip will also transmit continuously. When the transmitter has no button pressed, the PT2262 is not powered on, and its 17 pin is low, so the 315MHz high-frequency transmitter circuit does not work. When a button is pressed, the PT2262 is powered on and its 17 pin output For the modulated serial data signal, when the 17 pin is at a high level, the 315MHz high-frequency transmitting circuit starts to vibrate and transmits a high-frequency signal of equal amplitude. The transmitting circuit is completely controlled by the digital signal output by pin 17 of PT2262, so as to complete the amplitude keying (ASK modulation) of the high frequency circuit, which is equivalent to the amplitude modulation of the modulation degree.