Pyroelectric infrared induction automatic light circuit (5)

The pyroelectric infrared induction automatic light is made of special modules , so the circuit is very simple. HD-03C is a special module for pyroelectric infrared
produced by Zhejiang Xianju Yongling Electronics Factory . It has a pyroelectric infrared processing circuit inside. When used, it only needs to be connected to the pyroelectric infrared sensor rIR. The module has 10 external pins, and the functions of each pin are: ①~③ pins are connected to PIR respectively, of which ① pin is the ground terminal GND, connected to the G pin of PIR, ② pin is .III1, connected to the PIR signal input source Threshold S, ③ pin is VRlE_F, connected to the PIR drain threshold D, ④ pin is the module power supply positive terminal Vm,; ⑤ pin is the delay control terminal ra, change its peripheral resistance R. The value of the capacitor L' can be used to adjust the output control time; ⑥ pin is the negative terminal of the module power supply (; ND; ⑦ pin is the light control input terminal CDS, and an external photoresistor RI. can be used to rest during the day and work at night; Pin ⑧ is the zero-crossing detection terminal ZCD. It generates zero-crossing detection pulses according to the alternating current frequency to make the bidirectional thyristor conductive at the zero-crossing point of the alternating current, effectively reducing the harmonic interference when the thyristor is turned on. Pin ⑨ The H{ terminal is the trigger pulse signal input terminal TRIAC. It directly triggers the thyristor to open; the ⑩ pin is the DC signal input terminal REI.AY. After amplification, it can directly drive the relay.     In the figure, HD-03 (, The trigger pulse output from the TRIAC terminal of pin ⑨ drives the thyristor VTH to turn on, causing the lamp F to light up automatically. RI is a photoresistor, and its resistance is very small during the day, so that the pin ⑦ of the module is low level , and the module is blocked for a small J_ operation. , only when night falls, pin ⑦ is high level, and module 4 can be triggered by PIR. If you want the module to operate all day long, you can leave RL unconnected and leave pin ⑦ floating. When someone is within the PIR detection range When there is activity, VTH is turned on and the light E is on; after the person leaves, the light goes out automatically after a delay of 6()s . Change the values ​​of R. and c. to adjust the delay time of the circuit. Circuit I, IR The requirements are the same as in the previous example.