infrared beam proximity detector

  
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.
infrared beam proximity detector - schematic

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.



Recommended videos


  • Laser Light Security Alarm Circuit
    Duration: 0:45.
  • how to make a very simple Infra Red IR proximity sensor for Robots
    Duration: 2:18.
  • Populaire video
     

News


  • Yahoo Finance
    Instruments Reports Third-Quarter Results... photoelectric smoke and combination smoke and carbon monoxide and expects to start delivery of these products in the first fiscal quarter of the fiscal year ending March 31, 2018." said Harvey G
     21 February 2017
  • Condé Nast Traveler
    Condé Nast Traveler UnscreenedIn response to the incident, the TSA told Condé Nast Traveler that it is "reviewing reports of a possible incident" at T5, and pointed out that for the three passengers who set off the , it "c
     21 February 2017
  • KATC.com | Continuous News Coverage ...
    KATC Lafayette News
    KATC Lafayette News leaves woman questioning co - KATC.com | Continuous News Coverage ...Turns out, Safety First was sold in May of 2016 to a company in Connecticut that is now contracting workers in Louisiana to service their customer
     20 February 2017
  • Jackson County Floridan
    ... three medical transports, one medical alarm, three , four fire alarms, two medical lift assists, 16 traffic stops, one larceny complaint, one criminal mischief complaint, three civil disputes, one follow-up investigation, one fight in
     20 February 2017
  • Apache Junction Independent
    Apache Junction residences can have two false a year at which a tiered fee would be assessed for each subsequent alarm in an ordinance change approved by the city council. A tiered $50 fee will be assessed for each subsequent alarm, such&nb
     18 February 2017
  • Security Sales & Integration
    Security Sales & Integration MINNEAPOLIS — Honeywell's AlarmNet communications network has expanded its integration with I-View Now video alarm verification (VAV) technology ...
     16 February 2017
  • Security Sales & Integration
    Security Sales & Integration Silent tripped by sensors throughout the property alert the monitoring service to any suspicious activity. If corresponding cameras show a crime in progress, personnel can immediately communicate with the pe
     13 February 2017
  • Satellite PR News (press release)
    Market Supply-Demand, Industry Research and End User Analysis to 2021Europe Market Production, Supply, Sales, and Demand Research Report is a systematically conducted exhaustive study of the Europe market. The aim of the Europe Industry
     3 February 2017
  • Yahoo Finance
    DALLAS, Jan. 30, 2017 /PRNewswire/ -- MONI, a subsidiary of Ascent Capital Group, Inc. (Nasdaq: ASCMA) understands that when it comes to home and ...
     30 January 2017

.