As shown in the circuit diagram. After the AC220V mains is stepped down, rectified and filtered, a 12V DC voltage is obtained, which is then stabilized to obtain a Sv DC voltage, which is used to power the relay J1, the 89C2051 single-chip microcomputer and the 315 receiving module.
When the A button of the remote control is not pressed, there is no command signal output from the ⑩ pin of the receiving module, and the green indicator Dl of the Pl.0 port of the single-chip microcomputer flashes every 0.5 seconds. Dl serves as both a power indicator and a remote control command signal. At this time, if the A button of the remote control is pressed, the receiving module outputs a high-level signal from the ⑩ pin to the P3.0 port of the single-chip microcomputer after receiving the signal. The single-chip microcomputer outputs a low level from the P1.2 port and a high level from the P1.1 port, making the green light go out and the red light turn on. At the same time, the transistor Q1 drives the relay J1 to close, and the bell rings for 10 seconds before returning to the initial state. The complete program list is as follows (debugging has been passed).
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