This design is a wireless remote control switch system that enables long-distance lighting control, composed of two parts: transmitting systems and receiving systems. The system uses the wireless transceiver module to constitute the RF transmit and receive circuitry, the transmitting portion is mainly composed of a button address circuit, an encoded circuit, and an emission module; the receiving portion is mainly composed of a receiving module, a single-chip control circuit, and a load circuit. The launch system is powered by a 12 V dry battery. The receiving system is powered by 3 1.5 V dry batteries. The microcontroller is powered by 5 V DC power supply, power system energy saving, and simple.
Wireless transmit system circuit: mainly using the PT2262 chip to complete, circuit PT2262 encodes the button signal and can control 4 channels. In Fig. 2, 1 to 8 feet of the PT2262 are encoded addresses, each address end, can set "high level" (12 V), "low level" (on the foot), "floating" three State. 10 ~ 13 feet are encoded data inputs D3 to D0 (using 4-bit data), and a button is connected to each data to control different devices. When the button is pressed, the button is applied to the voltage of 12 V to the corresponding data, and the data end information will transmit the signal through the crystal oscillator. The PT2262 will encode based on the setting of the address code and the input data, output the encoded pulse from the 17 pin. Wireless communication is controlled by the encoded pulse. When the 17 foot pulse is "L", the oscillator of V1 operates, generates a high frequency signal of 315 MHz and emits it; when the 17 foot output pulse is "0", the VL composition is oscillation Stop work.
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Wireless receiving system circuit: The receiving system circuit is mainly composed of a receiving module (including radio frequency module, chip PT2272, and peripheral circuit), relay circuit, and load circuitry, as shown in FIG. The 1 to 8 feet of the PT2272 are decoded addresses, each of the addresses (5 V), "low level" (this foot), "floating" three states, The setting of the decoded address corresponds to the address encoding of the PT2272. When the radio frequency module receives the signal emitted by the transmitting circuit, the PT2272 performs an address code comparison check (decoding), if the address code is correct, the transmitting module TE pin (encoded start-up end is used for multi-data encoded emission, low level is effective The transmitted signal is entered into the PT2272 by the DIN pin (14 pin), and the data output foot D0 to D3 (10 to 13 foot) of the PT2272 is input to the microcontroller; the Data output foot 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 microcontroller displays "11" (first "1" represents the first signal, and the second "1" indicates that the signal is high. At the same time, the single-chip microcomputer emits high levels, relay, and load circuit work; when the second receives high level, zero will be set to the corresponding port level; when the third reception is received Set 1, so loop; when the digital tube is displayed as "1 1" (the first 1 represents the first signal signal, the second 1 means that the signal is low), at which time the single-chip microcomputer emits low power to the relay circuit. Flat, relay is disconnected, and the load stops working. Flexible control and clear display can be achieved by using relays and digital tubes. Be
This design utilizes the MCU AT89S52 and chipset PT2262 / 2272 to achieve programmable 4-way wireless switching system for lighting control, avoiding limits using dedicated decoding chips, can make full use of system software and hardware resources, system scalability and flexibility Sex, low cost, small power consumption, is a scientific solution for smart home lighting control.
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