Pyroelectric sensor alarm system design
The pyroelectric sensor alarm circuit is mainly composed of a signal detection circuit, a signal processing circuit and an alarm circuit. The system block diagram is shown below.
Scheme system diagram
The scheme uses RE200B as the signal detection. When someone moves, the sensor emits an electric signal of about 0.5v, and is rectified and filtered to reach the amplifying circuit. The amplifying circuit is composed of a secondary operational amplifier, and outputs a high level of 3.8v into the signal processing circuit.
The signal processing circuit compares the input signal with the signal from pin 9 through the AND gate. The pin 9 is continuously input to the high level due to the large resistance. Therefore, the signal processing circuit outputs a high level when it detects someone moving. Enter the delay circuit. The delay circuit is composed of a resistor series capacitor. After a fixed period of time, the output electrical signal turns on the triode, and the triode opens the alarm circuit.
Circuit designPyroelectric sensor
RE200B physical map
RE200B schematic
The pyroelectric sensor model used is RE200B, which uses the characteristics of pyroelectric material polarization to change the infrared radiation, and cooperates with the dual-sensitivity complementary method to suppress the interference caused by temperature change and improve the stability. It detects the change in infrared energy emitted by the object in a non-contact form and converts it into an electrical signal that is output from pin 2.
The 2-pin output signal, so a 47kΩ resistor and a 0.1uF capacitor are added around it to rectify and filter to eliminate interference.
Biss0001
Biss0001 secondary amplification and delay circuit
Biss0001 is a high performance sensing signal processing integrated circuit. With the pyroelectric infrared switch which can be composed of RE200B, the buzzer can be turned on quickly in this test. The chip is mainly composed of a secondary operational amplifier circuit, a logic circuit, a lockout time timer, and a delay time timer.
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