1. September 18, 2012 at 5:44 pm


    I want the circuit diagram for digital counter using sensor .

  2. December 22, 2012 at 1:06 am


    hye sir, can u give me the example how to make this circuit? i mean how to create this project.. i really need it..

    1. December 27, 2012 at 12:11 pm

      Sagar Sapkota

      The circuit connection has been shown on this page. First learn how to make project on breadboard: http://www.buildcircuit.com/building-a-circuit-on-breadboard/. Then, you can easily build the object counter circuit.

  3. March 25, 2013 at 3:17 am

    tan wei ren

    I have already made the circuit but its not working . I think the problem is the ir sensor . because the rest of the component is working .

  4. March 31, 2013 at 7:53 am


    Can I get a comprehensive circuit diagrams on microcontroller based digital object counter?

    1. March 31, 2013 at 9:12 am

      Sagar Sapkota

      I don’t have that. sorry.

  5. June 29, 2013 at 11:28 am


    sir, i have question on these can u help to answer me ?

    1. The seven segment display can i use the pin are in horizontal form?

    2. The infrared detector, must i use exactly as TSOP4838?

    3. Can the counter start from 0?

    Thank you

    1. June 29, 2013 at 6:55 pm

      Sagar Sapkota

      1. Yes, you can use.
      2. No, you can use other infrared sensors also. For example, TSOP1738
      3. Yes you can start from zero.
      Please check this article also: http://www.buildcircuit.com/digital-object-counter-diy-kit/

      1. June 29, 2013 at 8:44 pm


        Sir thx for your answer but now when i start work on it i found some new question would u answer me again?

        1. First, all my module (RC,infrared detector and counter) can work independently but when i connect all together, the LED of my RC module and infrared detector will light up. I thought it will only bright up only when receive IR. Is that my circuit connection problem?

        2. Then for the counter, the seven segment when connect to 4026B is it only show 8. And it will only start counter when i connect to some other module such as 555 timer

  6. October 11, 2013 at 3:00 pm


    hey sagar plz help me to make an eye blink counter with this ir transmitter and receiver principle

  7. January 12, 2014 at 5:54 am

    Mahesh mani

    Sir I want to built up a 4 digit counder (motor speed counder with gear system) please implement and upload

  8. January 29, 2014 at 3:41 pm


    hi,you don’t mind if i want schematic diagram ..please reply ..

  9. February 4, 2014 at 2:49 pm


    first you want to put circuit diagram after you think about circuit dig

  10. July 25, 2014 at 10:57 am


    Hi Sir , can this circuit connect to arduino ? I want to make this as my counter to stop my robot arm.


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