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Category: Security Circuits / Alarm Circuits This circuit is also crossed to: Human Sensing Circuits , Sensor Circuits , Infrared , 555 Timer Circuits Views: 378 Rank: 0 his circuit can be used as an Infrared beam barrier as well as a proximity detector. The circuit uses the very popular Sharp IR module (Vishay module can also be used). The pin nos. shown in the circuit are for the Sharp & VIshay modules. For other modules please refer to their respective datasheets. The receiver consists of a 555 timer IC working as an oscillator at about 38Khz (also works from 36kHz to 40kHz) which has to be adjusted using the 10K preset. The duty cycle of the IR beam is about 10%. This allows us to pass more current through the LEDS thus achieving a longer range. The receiver uses a sharp IR module. When the IR beam from the transmitter falls on the IR module, the output is activated which activates the relay and de-activated when the beam is obstructed. The relay contacts can be used to turn ON/OFF alarms, lights etc. The 10K preset should be adjusted until the receiver detects the IR beam. The circuit can also be used as a proximity sensor, i.e to detect objects in front of the device without obstructing a IR beam. For this the LEDs should be pointed in the same direction as the IR module and at the same level. The suggested arrangement is shown in the circuit diagram. The LEDs should be properly covered with a reflective material like glass or aluminum foils on the sides to avoid the spreading of the IR beam and to get a sharp focus of the beam. When there is nothing in front of them, the IR beam is not reflected onto the module and hence the circuit is not activated. When an object comes near the device, the IR light from the LEDs is reflected by the object onto the module and hence the circuit gets activated. If there still a lot of mis-triggering, use a 1uF or higher capacitor instead of the 0.47uF. visit page.  The receiver uses a sharp IR module. When the IR beam from the transmitter falls on the IR module, the output is activated which activates the relay and de-activated when the beam is obstructed. The relay contacts can be used to turn ON/OFF alarms, lights etc. The 10K preset should be adjusted until the receiver detects the IR beam. The circuit can also be used as a proximity sensor, i.e to detect objects in front of the device without obstructing a IR beam. For this the LEDs should be pointed in the same direction as the IR module and at the same level. The suggested arrangement is shown in the circuit diagram. The LEDs should be properly covered with a reflective material like glass or aluminum foils on the sides to avoid the spreading of the IR beam and to get a sharp focus of the beam. When there is nothing in front of them, the IR beam is not reflected onto the module and hence the circuit is not activated. When an object comes near the device, the IR light from the LEDs is reflected by the object onto the module and hence the circuit gets activated. If there still a lot of mis-triggering, use a 1uF or higher capacitor instead of the 0.47uF. http://electronic-circuits-diagrams.com/alarmsimages/alarmsckt19.shtml
Related circuits When the protective circuit is interrupted (opened), the alarm sounds High-Power Alarm Driver Circuit In this circuit, a low-powered SCR is used to trigger a liigher powered SCR. When a switch is opening (S2, S3, S4) or closing (S5, S6, S7), either SCR1 or SCR2 triggers. The circuit presented here wakes you up with a loud alarm at the break of the daylight. Once again the 555 timer is used here. It is working as an astable multivibrator at a frequency of about 1kHz. The circuit's operation can be explained as follows: When no light falls on the LDR, the... Networking Security System (ATmega16L) TCP based security system using the Ethernet module offered within the contest , an ATmega16L microcontroller , a PIR as a sensor and few other peripheral devices , which is specially targeted for homes and small business owners. I have used through for my final design a combination of the... The circuit has two ranges: 10 sees to 5 mins and 1 min to 80 mins. It can be powered by a 9-V battery. With the LED connected as shown a reasonable frequency of flashing occurs throughout the range of operation. Carrier-Current Baby-Alert Transmitter Circuit The baby-alert transmitter is built around an LM324 quad op amp (Ul), two LMC555CM CMOS oscillator/timers (U2 and U3), and a few support components. The transmitter sends a signal on receipt of a sound at MIC1. This is a simple but effective alarm circuit which can reset its self after a time that you select. it has normally open and normally closed triggers which make this circuit very practical. This alarm has normally open and normally closed triggers. It`s on a 555 timer so the alarm will reset it`s... The idea behind this snore alarm, is just to rouse the snorer, not the entire household. To wake the sleeper, vibration is used, not an audible alert. The vibration is provided by a small motor housed in a small 35mm film case, which can be placed under the sleepers mattress or pillow. This...
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When the infrared beam emitted by D1 is reflected by a nearby object, IC1, through receiver diode D2 and transistor T2, receives the recovered 20 kHz signal at its input, pin 3. Infrared Proximity Detector Alarm Circuit Diagram ...
DTMF Proximity Detector. A DTMF-based IR transmitter and receiver pair can be used to realize a proximity detector. The circuit presented here enables you to detect any object capable of reflecting the IR beam and moving in ...
Welcome again ,Free circuit dot com have the circuit can be used as an infrared beam barrier and a proximity detector. The circuit uses the very popular Sharp IR module (Vishay module can also be used). NOS pin. circuit is ...
This circuit can be used as an Infrared beam barrier as well as a proximity detector.the circuit uses the very popular Sharp IR module (Vishay module can also be used). The pin nos. shown in the circuit are for the Sharp & VIshay modules.
Short Circuit Protection: YES. Overload Trip Point: 220MA. Material Active Face: POM/PBT. For data sheet down load please visit: http://www.progreen.co.in/proximity-sensor. Posted 17th May by pro green digitals ..... Widest range of proximity sensors which include Inductive, Capacitive, Photoelec...
Upon reception of infrared signals, the 555 timer (mono) is turned 'on' and it re-mains 'on' as long as the infrared signals are being received. Circuit Diagram : Proximity Detector-Circuit-Diagram. Proximity Detector Circuit Diagram. When no more ... 25 cms can be sensed. This circuit can be use...
Long Range (10 meters / 33 Feet or more) IR Beam Cut Detector Circuit
what is proximity sensor
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