3 Sets DIY Pyroelectric infrared Sensor Kits Anti-theft Circuit Electronic Technology Training Sets
$27.93
Shipping:Standard Shipping about 10-25 business days
Secure Payment:Paypal,VISA,MasterCard
Description
Size:82 x 44mm
Texture of material:Two-sided 1.6mm FR-4 board
Long life Low ESR
Function
Pyroelectric infrared sensor security circuit consists of pyroelectric infrared sensor PIR, integrated operational amplifier LM358, voltage comparator LM393, 110 alarm circuit and boot delay circuit, etc.. The circuit can be used as home security. When the family leaves the room, the switch K1 is closed, the circuit starts to work. As long as someone enters the room after a period of time, it will sound alarm.
1. The circuit is energized, the pyroelectric infrared signal of infrared sensor PIR to detect the front radiation of human body, from the signal PIR 2 feet output weak, after amplification transistor VT1, through the C2 input to the op amp IC2A 3 foot high gain low noise amplifier, and then by IC2A the inch1 footinch output signal.
2. IC2B in the circuit as a voltage comparator, its inch5inch pin voltage reference is provided by R10, VD1, IC2A when the inch1inch foot output signal to the IC2B inch6inch feet, inch5inch and inch6 footinch input voltage is compared, if at this time the inch6 footinch voltage ratio 5 feet high, 7 feet of IC2B from high level to low level. The C6 through the VD2 discharge, the IC3 2 feet into low level, if the voltage reference voltage of 2 feet inchthaninch 3 inchfeet of a resistance R14, partial pressure of R15 with low IC3, theinch 1 foot inchinto a high VT2 transistor conduction music chip IC4 theinch 2 foot inchvoltage, output audio signal after amplification transistor VT4, buzzer driver BELL issued 110 alarm sounds.
3. When people leave the detection area, IC2B’s inch7inch feet to high, VD2 cut-off, C6 has a charging time (30 seconds), making the buzzer delay alarm for 30 seconds.
4. VT3, R20 and C7. The time delay circuit, about 2 minutes (should be greater than the alarm delay time), to prevent the alarm immediately when starting up, let people have time to leave the scene, but also can prevent misoperation in power after the call.
Package included
3 x DIY pyroelectric infrared sensor kits
Weight | 0.081 kg |
---|
Customers Also Viewed
Solar Powered Floating Bird Bath Water Fountain Pump Pond Pool Water Pump
$42.51Electrical Pump & ValveAdd to cartDescriptionThis product is solar-powered decorative fountain.It is made up of highly efficient solar panel and new brushless pump.IT is start-up fast,efficient and strong stability.In addition,it has no electric outlet or external battery,so it’s not only easy to use,but also safe.This product is suitable for bird bath,fish tank,small pond,garden decoration,water circulation for oxygen,etc.FeatureSolar panel:7V/1.4WBrushless pump input:DC4.5-10VMaximum …
Solar Powered Floating Bird Bath Water Fountain Pump Pond Pool Water PumpRead More
Vibration Switch Sensor Module Vibration Sensor Alarm Module Smart Car Accessories
$4.36Sensor & Detector ModuleAdd to cartFeatures 1. Onboard LM393 voltage comparator chip and vibration sensing probe2. Support 5V/3.3V voltage input3. Onboard signal output indication, the output valid signal is low level and the indicator light is on, the output signal can be directly connected with the single chip IO4. The sensitivity of signal detection can be adjusted5. With 3mm screw …
Vibration Switch Sensor Module Vibration Sensor Alarm Module Smart Car AccessoriesRead More
TPA3116 Dual Channel 50Wx2 Digital Amplifier Board
$23.15Amplifier BoardAdd to cartSpecificationPower amplifier chip:TPA3116Power supply voltage:11 ~ 26VDC DC input with limit reverse polarity protection(Recommended DC 24V current 3A and above switching power supply)Output power:stereo 50W + 50W, PBTL monaural 100WLoad impedance:4 to 8 ohms (horn speaker impedance)Audio input:2.54mm3 pin seatPackage Included1 x Digital Amplifier Board
5pcs Geekcreit 3 in 1 AC 60-500V 100A Square Yellow LED Digital Voltmeter Ammeter Hertz Meter Signal Lights Voltage Current Frequency Combo Meter indicator Tester with Round CT
$48.24Electronic Accessories & SuppliesAdd to cartDescriptionDisplay:Voltage, current, frequencyDisplay color:YellowMeasuring voltage range:60~500V AMeasuring current range:6~100AMeasuring frequency range:20-70HzSize:2.8*5cm/1.10inch*1.97inch (D*H)Note:Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!!Package included5 x 22MM Indicator5 x Round CT
5pcs Nano V3.0 Terminal Adapter AVR ATMEGA328P without NRF2401+ Expansion interface DC Power Board
$38.18Expansion Board & ShieldAdd to cartFeature1. The item is a terminal expansion adapter, working very well for prototyping Nano projects2. There are pins expansion hole for the NANO board, which can directly lead the pins; With DC power supply interface, you can directly add external power or battery to supply power3. With NRF2401+ expansion interface, you can insert NRF2401+ to …
Reviews
There are no reviews yet.