Feature
Board size:5*4.9cm
Power supply voltage:5-6V DC
Function realization
The human body infrared sensor alarm circuit is composed of pyroelectric infrared sensor PIR1 (D203S), infrared sensor signal processor U1 (BISS0001), voice chip IC1 (C002) and alarm circuit. The circuit can be used as a home anti-theft, without sound, light, vibration, even in a dark state, once it enters the monitoring range, the circuit will automatically detect and emit a high-intensity alarm.
Circuit principle
1. BISS0001 is a digital-analog dedicated integrated circuit composed of an operational amplifier, a voltage comparator, a state controller, a delay time timer, and a blocking time timer.
2. Add a DC voltage of 5 to 6V to J1 in the circuit. When the pyroelectric infrared sensor PIR1 detects the infrared signal radiated by the human body in front, the S pole of PIR1 outputs a weak electrical signal, which is sent to U1 14 pin, by The internal operational amplifier OP1 performs stage amplification and then outputs from pin 16, which is coupled to pin 13 via C9 to perform the second stage amplification for the operational amplifier OP2. Then, it is detected by the bidirectional amplitude discriminator composed of the voltage comparators COP1 and COP2 and then detected. The effective trigger signal VS starts the delay time timer. After the output signal VO at pin 2 is divided by R14 and R15, it is supplied to the power supply voltage at pin 4 of IC1. The second pin of IC1 outputs 110 alarm music signal, which is amplified by VT1 to drive the bee Buzzer BELL1 sounds an alarm.
3. The potentiometer RW1 is used to adjust the detection sensitivity of the infrared sensor, that is, the detection distance is adjusted to 1 to 2 meters, and RW2 is used to adjust the alarm sounding delay time, and the adjustable range is 1 to 30 seconds.
Package includes
1 x DIY KIT
Additional information
| Weight | 0.016 kg |
|---|
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