Build an IR Beam Breaker


Posted on Feb 5, 2014

IR Beam Breaker Circuit Diagram. This is an Infrared beam breaking alarm ideal to use in entry or passages. It is based on the working of the popular IR sensor Module TSOP 1738 which senses 38 kHz Infrared pulses from the IR LED of the transmitter. Range of the circuit is about 5 meters if the transmitter and receiver are properly aligned TSOP 1738


Build an IR Beam Breaker
Click here to download the full size of the above Circuit.

IR sensor module responds to only 38kHz pulsed infrared rays. It will not sense continuous IR ray from the IR LED. So a transmitter circuit(as one in TV remote handset) based on 555 IC is required. Any standard transmitter circuit based on 555 IC can be used. But its output should be 38kHz exactly. TSOP 1738 gives 5 volt output and 5mA current in the off position. That is when IR rays are not available. Its output is current sinking so that when it receives 38kHz IR rays, output becomes zero. Pin 2 of the module should get a supply voltage between 4. 5 to 6 volts. Higher voltage above 6 volts will destroy the device. The module is generally immune to ambient light, but may responds to sources of noice such as electronic ballasts. Out put from the IR module is given to the inverting input of IC1. LM311 is a precision voltage comparator. It looks like the common Op Amps like LM741, CA3130, CA 3140, TL071 etc. But its pin connections and output are different from other Op Amps.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    PIC16F627A Touchpad circuit
    Low-power-magnetic-current-sensor
    1000:1 Tuning Voltage-Controlled Filter
    Water-Leak Alarm
    Inverter size strength
    stepper motor controller schematic
    reservoir pump controller
    Portable Phone Preamplifier
    A 75 W Tv Power Supply Operating In Quasi-square Wave Resonant Mode Using Ncp1207 Controller
    Boost Converter With Usb Power Switch
    Glolab 4 Bit Encoder/Decoder for Wireless and Infrared
    Home-made high-performance four-dimensional surround sound amplifier circuit
    Isolated send receive ring circuit diagram XTR105 RCV420
    Thermostat with three-wire serial interface smart temperature sensor DS1620 configuration control circuit



    Top