Object motion detector circuit diagram

Published:2011/9/26 22:20:00 Author:Rebekka | Keyword: Object motion detector | From:SeekIC

The heart of the motion detector movement detection circuit is motion detection chip IC1 (KC778B). The signal frequency from PIR sensor is low (0.1Hz ~ 10Hz) while the band is very wide, the chip will optimize it. The working voltage of KC778B is 4V ~ 15V, 78L05 requires 9V ~ 12V input voltage. The circuit has three sensitivity controllers. You can see a brief description in the figure. The detection sensitivity is cotrolled by the semi-variable resistor P1 connecting on chip 2 feet. When the level of the pin is connected to the sensor, thepotential is equal to the potential on pin 7(about 0.5V),and thesensitivity is the lowest. When pin 2 is grounded (about 0.125V), system sensitivity is the maximum. Sun sensitivity is controlled by semi-variable resistor and P2 photodiode LDR. Generally we hope that this detector does not work in the daytime, but only work at night, and itmay be connected to the lighting line. If you do not need this feature, you can connect Vcc pin on 12 feet and 11 feet will be vacant. P3 is adjusted by the timing pulse, the output pulse width in the range is more than 1.5s.



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