Smart home lighting control switch transmitting and receiving circuit module design

The design is a wireless remote control switch system capable of realizing remote lighting control, and is composed of a transmitting system and a receiving system. The system uses a wireless transceiver module to form a radio frequency transmitting and receiving circuit. The transmitting part is mainly composed of a key addressing circuit, an encoding circuit and a transmitting module; the receiving part is mainly composed of a receiving module, a single chip control circuit and a load circuit. The transmitting system is powered by a 12 V dry battery. The receiving system is powered by three 1.5 V dry batteries. The MCU is powered by a 5 V DC power supply. The power supply system is energy efficient and simple.

Wireless transmission system circuit: mainly used PT2262 chip to complete, circuit PT2262 encodes the button signal, can control 4 channels. In Figure 2, pins 1~8 of PT2262 are coded address terminals. Each address terminal can be set to “high level” (the pin is connected to 12 V), “low level” (the foot is grounded), and “floating”. State. Pins 10~13 are coded data inputs D3~D0 (using 4-bit data), and a button is connected to each data terminal to control different devices. When the button is pressed, the button applies a voltage of 12 V to the corresponding data terminal, and the data terminal transmits the signal through the crystal oscillator. The PT2262 will encode according to the address code setting and input data, and output the encoded pulse from pin 17. The wireless communication is controlled by the coded pulse. When the 17-pin pulse is “1”, the oscillator composed of V1 operates to generate a high-frequency signal of 315 MHz and is transmitted. When the output pulse of the 17-pin is “0”, the oscillation of V1 is formed. The device stops working.

Wireless receiving system circuit: The receiving system circuit is mainly composed of receiving module (including RF module, chip PT2272 and peripheral circuit), relay circuit and load circuit, as shown in Figure 3. Pins 1~8 of PT2272 are decoding address terminals. Each address terminal can be set to “high level” (the pin is connected to 5 V), “low level” (the foot is grounded), and “floating”. The setting of the decoding address corresponds to the address encoding of the PT2272. After the RF module receives the signal sent by the transmitting circuit, the PT2272 performs address code comparison check (decoding). If the address code is checked correctly, the transmitting module TE pin (the encoding start end is used for multi-data encoding and transmitting, and the active level is valid. The signal sent to the RF module is connected to the PT2272 by the Din pin (14 pins), and the data enters the MCU through the data output pins D0~D3 (10~13 pins) of the PT2272; otherwise, the data output pin of the PT2272 has no action. When the signal enters the microcontroller, the microcontroller analyzes it and makes corresponding control. If the received first signal is high, the digital display tube controlled by the MCU will display “11” (the first “1” indicates the first signal, and the second “1” indicates that the signal is high. At the same time, the MCU sends a high level to the relay circuit, the relay pulls in, the load circuit works; When the second time receives the high level, the corresponding port level is set to zero by the MCU; when the third time receives the high level Set to 1 again, so cycle; when the display of the digital tube is "1 1" (the first 1 indicates the first signal, the second 1 indicates the signal is low), then the microcontroller sends a low power to the relay circuit. Flat, the relay is disconnected and the load stops working. Flexible control and clear display with relays and digital tubes.

This design uses the single-chip AT89S52 and the chipset PT2262/2272 to realize the programmable 4-way wireless switching system for lighting control, avoiding the limitations of using the dedicated decoding chip, making full use of the system hardware and software resources, and the system's scalability and flexibility. Good performance, low cost and low power consumption are a scientific solution for smart home lighting control.

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