Digital Object Counter using LDR and digital IC

New Project: 
Easy Steps for making infrared based object counter


We need following components for making an object counter

1. 555- configured in monostable mode(automatic dark sensor  using 555)

2. 555- configured in Astable mode

3. 7490- decade counter- Click here to get the datasheet

4. 7447- BCD to seven segment display- Click here to get the datasheet.

5. Seven segment display- Common Anode

Here, CC-Common Cathode and CA-Common Anode.

6. Resistors- see the schematic

7. Capacitors- see the schematic

8. Light dependent resistor (LDR)

9. LED

10. Power supply

There are basically three modules in object counter:

  1. 555 timer configured in monostable mode.
  2. 555 timer configured in astable mode.
  3. Counter module.

555 timer configured in monostable mode is a simple automatic dark sensor circuit that gives output when light falling on LDR is blocked. Pin 3 of monostable circuit has been connected to pin 4 of astable timer. When monostable circuit generates output, astable mode timer starts giving pulses to the counter module.

Frequency for counter module is set up using R4, R3 and C2.

7490 acts as a decade counter and 7447 uses the output of 7490 to display numbers on seven segment display.

This circuit counts from 0 to 9.

Click here to read about ‘How digital Clock works?’

OUTPUT: If you block light falling on LDR, the number on seven segment display will increase.

Click here to read about ‘How digital Clock works?’

 Check the following tutorial also.

We have recently released a 3 digit digital object counter kit. You can buy the kit at BuildCircuit store. 

  • 3 Digit Digital Object Counter ASSEMBLED Kit With Infrared Transmitter And Laser Module

    US $14.95
    12 items sold

    3 Digit Digital Object Counter ASSEMBLED Kit With Infrared Transmitter And Laser Module

    US $14.95
    12 items sold

    This is 3 digits digital object counter kit for electronics beginners and hobbyists. It is the upgraded version of our previous 2 digits and 3 digits object counter.

    You can use this 3 digits digital object counter for counting objects or people entering in a room. It can be used by engineers for learning about digital counters.

    This DIY digital object counter works with VS1838 infrared receiver and photoresistor and there are three seven segment displays displaying numbers from 0 to 999. An IR transmitter is directed towards the VS1838 infrared receiver of the counter module and objects are moved between the two modules. Each time an object passes between the two modules, the seven-segment displays show increment in numbers from 0 to 999.

    45 in stock

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Check out all the counters

  • 1.8″ Photoresistor And Laser Operated Medium Digital Objects Counter

    US $19.95
    13 items sold

    1.8″ Photoresistor And Laser Operated Medium Digital Objects Counter

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    This is an upgraded version of the previous digital objects counter kit. The device has 1.8″ common cathode seven segment displays.

    The kit is based on the CD4026 decade counter.

    4 in stock

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  • 2.3″ Common Anode Seven Segment Display Driver

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    2.3″ Common Anode Seven Segment Display Driver

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    This is a 74LS192 based up and down counter driver module for driving 2.3 inches seven segment display. The module has headers on two sides to receive up/down count signals and to concatenate with another driver module.

    The module can be triggered with NE555, flashing LED, and Arduino. It can also be triggered by anything that generates a clock pulse.

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  • 2.3″ common cathode seven segment display driver

    US $11.95US $12.95
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    2.3″ common cathode seven segment display driver

    US $11.95US $12.95
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    This is a CD4026 based up counter driver module for driving 2.3 inches common cathode seven segment display. The module has headers on two sides to receive up count signals and to concatenate with another driver module.

    The module can be triggered with NE555, flashing LED, and Arduino. It can also be triggered by anything that generates a clock pulse.

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  • CD4026- 1 Digit Up Counter Module

    US $4.95
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    CD4026- 1 Digit Up Counter Module

    US $4.95
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    • It works as an UP counter. You can instantly test the up count of the display using a flashing LED.
    • It is a handy tester for 0.56″ seven segments common cathode display.
    • Works with Arduino or NE55 or whatever that gives pulse.
    • You can concatenate as many displays as you want.
    • With this, you can build your own digital objects counter.
    • Size: 15mmx49mm

    50 in stock

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  • CD4029 Based Up And Down Counter For Arduino And NE555

    US $7.95
    21 items sold

    CD4029 Based Up And Down Counter For Arduino And NE555

    US $7.95
    21 items sold

    50 in stock

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  • Photoresistor And Laser Operated Large Digital Objects Counter With 2.3″ Displays

    US $29.95
    9 items sold

    Photoresistor And Laser Operated Large Digital Objects Counter With 2.3″ Displays

    US $29.95
    9 items sold

    A laser light module illuminates the photoresistor continuously and whenever any object obstructs the laser light falling on the photoresistor, the counter increases the count. You can use this 3 digit digital objects counter for counting objects or people entering a room. It can be used by engineers for learning about digital counters.

    4 in stock

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27 thoughts on “Digital Object Counter using LDR and digital IC

  1. thnk u …
    i want this circuit for college exibition work… i searched the for more but i can’t get now only i got it thnk u once again …

  2. i am doing the simple project on digital logic as the object counter.
    isn’t there another easy way to design the circuit for object counter using transistor,decay counter and LDR?

  3. I complete my project of object counter using resistors ,LDR,seven segment display etc.the project is very easy to understand and making methods also easy.

  4. i connected the circuit according to the circuit diagram and although the led 1 is lighting and led 2 is blinking d 7 segment display is not working.can anyone tell me where i could have gone wrong?

  5. i did proper connections in the circuit..my led1 glows throughout the procedure..led2 blinks once at the starting..decade counter started but its not increasing the count when m blocking light from ldr.can anyone help me?

  6. I was made this projects. My soldering is also propered. Led 2 is blinking .and led1 is lighting. There are work my project. But there are not any effect of LDR on display. .display was automatic run. . So, what i do or anything wrong in project . .say me friends please. .it’s urgent.

  7. I was made this projects. My soldering is also propered. Led 2 is blinking .and led1 is lighting. There are work my project. But there are not any effect of LDR on display. .display was automatic run. . So, what i do or anything wrong in project . .say me friends please. .it’s urgent. . .

  8. guys i to hav done this ect but with out the effect of ldr the 7 segment is increasing..

    please suggest me the rating of ldr to be used or this circuit is wrong?

  9. Perfect project !! reliable…. for those who say increment takes place without the control of LDR, place a light source near the LDR (because your LDR is less sensitive)….

  10. Please may I consult with specialist of you that if I would like to finish a practice for running 0 to 9 digital numbers with 7 LEDs with Arduino controller and breadboard but have no the Seven segment display component. If possible, would you please kindly share the program and connection circuit dirgram for my reference to test for learning. Thank you in advance.

  11. the project is nice but the 7 segment display is continuously counting please help me to work this project as the description given

  12. can you put an additional circuit that will subtract as the motion goes the opposite way? for example a person entering will add then a person leaving will subtract, BUT on the same sensor. so you need two sensors on the same line and will just have to detect if sensor 1 is the first to get blocked that sensor two then add, or if sensor two is the first to get blocked then subtract. is that possible?

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