The design idea of ​​the system block diagram is that the human body information and the natural illumination information are used as the basis for the opening and closing of the illumination lamp, and the specific execution of the illumination lamp opening and closing is controlled by the single chip circuit (ie, the control circuit).
The detection of natural light intensity uses a photoresistor, and the acquisition of human body information uses a pyroelectric sensor, that is, a far-infrared probe. When the light is insufficient, once the human body enters its sensing area, the far-infrared probe converts the human body's infrared radiation into an electrical signal and sends it to the relevant circuit for processing. In order to enhance the information induction intensity and expand the sensing range, it is necessary to install a Fresnel lens in front of the probe; in order to overcome the passive characteristics of the far-infrared probe, it is proposed to add a motor and a transmission mechanism, and if necessary, let the far-infrared probe rotate 180° back and forth. Or horizontally moving back and forth, the passive infrared induction becomes a relatively active infrared induction, as long as someone exists in the sensing area, regardless of whether he is active, the human body information can be accurately detected.
The system consists of a power supply circuit, a human body signal detection circuit, a level conversion circuit, a single chip circuit, a motor bidirectional drive circuit, and an illumination lamp drive circuit. The level conversion circuit converts the 9V signal voltage output by the human body signal detecting circuit into a 5V voltage that can be received by the single chip microcomputer. The pulse signal generated by the human body signal detection circuit is sent to the single-chip microcomputer for processing after level conversion, and the single-chip microcomputer controls the motor bidirectional driving circuit, the illumination lamp driving circuit and the power supply circuit to generate several DC voltages for the whole system according to the processing result.
The human body signal detection circuit is composed of an infrared probe, an amplification and comparison circuit, a control and a delay circuit. The passive infrared probe PIR works according to the infrared spectrum of the human body. When the human body enters the sensing area in front of the lens, the infrared probe converts the infrared signal of the human body focused by the lens into an electrical signal, and amplifies, compares, delays, etc. the signal. Processing, eliminating clutter, adding light control, and then outputting the human body signal to the value and sending it to the subsequent circuit through the terminal. Adjusting RP1 changes the gain of the amplifier in IC1 to change the inductive strength of the signal. RP2 and C11 form a delay circuit. Adjusting RP2 can change the width of the output pulse to change the working delay. Since the delay of this system is controlled by the single-chip microcomputer, the delay should be shortened as much as possible. A light-sensitive resistor is connected between the foot 2 and the foot 9 of the IC2, and the internal circuit of the IC2 constitutes a light detecting and light-control level jump circuit, which can realize the daytime when the light is sufficient, and the light is not sensed at night or during the daytime when the light is insufficient. According to the characteristics of the light control, the circuit does not have a delay reaction circuit. As long as the person is at night, once the power is turned on or the power is turned off, the system starts immediately. This feature not only satisfies the needs of the light control, but also can be conveniently used. Check to see if the controller is good or bad. The circuit motor and its drive circuit are provided for the system to be capable of active infrared detection. The infrared probe is linked with the motor shaft through a reduction gear or a translating frame. In order to avoid the probe lead wire, the motor is designed to rotate 180° back and forth.
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