Pyroelectric infrared induction automatic light circuit (7)

An induction automatic light made of RDP-18 pyroelectric infrared sensing module . RDP-IS is a novel module produced by Zhejiang Huiniu City/Nan Radio Factory. It integrates all pyroelectric infrared control circuits and JiIR sensing It has a head and Fresnel lens, so the mouth path is very simple.     The RDP-18 module has 6 external colored leads. ①The red lead is the power terminal, and the voltage range is 6-9V. ②The yellow lead is an external delay capacitor. When the yellow line is suspended, the module is triggered and the output pulse width is 30s predetermined by the circuit. If a capacitor is connected in parallel between the yellow line and the green line, the output , that is, the output delay time increases. ③The green line is the external delay resistor terminal. When the yellow and green lines lbJ are connected to a delay capacitor, a delay resistor needs to be added between the green line and ground. The output pulse width is determined by the external delay capacitor and delay resistor values: If the fluorine is connected to the yellow and green wires of the module, once the module is triggered, there will be output at the output end until the power is cut off . ④The white line is the indication output terminal, u J can directly drive the light- emitting diode. ⑤The blue line is the output terminal. Since the module has an open-collector output inside and a pull-down current sink output , it can directly drive small relays and other tasks. ⑥The black wire is the ground terminal, connected to the negative pole of the power supply.     Figure 80 only uses RDP-18 module f. One lead is blue and black , and the other three leads are left floating. 2 20V AC power is rectified by VD2--VD5, R. Buck, vs stabilized and C filter output 6V DC voltage for RDP-18. When someone enters the detection range of the module, the blue line of its output terminal inputs a pull-down current sink to turn on VT1. The thyristor VT2 obtains a positive trigger current and turns on , and the lamp E lights up. As long as someone continues to move, the lights can be on and off. After the person leaves, Can will turn off itself after a delay of 30 seconds. This circuit is not equipped with a light control circuit , so it can be fully operated. It is especially suitable for use in dark stairwells or storage areas where lights need to be turned on during the day.