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BuildCircuit is an online store for selling electronics kits and components related to Arduino, Raspberry Pi, etc. We operate from Sydney, Australia.

We design and sell basic electronic kits and Arduino modules for all electronics enthusiasts.


3 Digit Digital Object Counter DIY kit

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AU $24.95
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It is 3 digit digital object counter do-it-yourself (DIY) kit designed for hobbyists. It is the upgraded version of 2 digit digital object counter.

You can use this 3 digit digital object counter for counting objects or people entering in a room. It can used by engineers for learning about digital counters. Since it's a DIY kit, it can only used for learning basic electronics. I don't think it is good for industrial use, if you can use it, that would be great. 

This DIY digital object counter works with TSOP4838 infrared receiver and there are three seven segment displays displaying numbers from 0 to 999. An IR transmitter is directed towards the TSOP4838 infrared receiver of 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. 

It comes as a pack of parts kit and is easily assembled if you can follow the silkscreen indicators(labels) and have beginning experience with a soldering iron. You will need to read the resistor bands or use a multimeter to determine the resistor sizes.

Both the kits operate with 9V batteries.


  • The distance between the transmitter and receiver modules can be around 1 meters.
  • The counter module can be reset to 0 at any time and restart the counting.
  • The counter module can be operated with any kind of remote control. Therefore, it can also be used as a remote tester. For each press on the remote control, there is an increment in number. 

 Kit package contains components for counter and IR transmitter modules:

A. Components for counter module

  • 3 x CD4026 Decade counter
  • 3 x 16-pin IC socket.
  • 3 x common cathode seven segment display-(Can be in red, yellow and blue colors)
  • 1 x TO-92 5V Voltage Regulator(78L05)
  • 1 x TSOP4838 Infrared sensor
  • 1 x 100uF Capacitor- (Voltage rating can be between 16V to 50V- causes no problem in operation)
  • 2 x 0.1uF 50V ceramic Capacitor
  • 2 x 3mm LED- (can be any color)
  • 1 x BC547
  • 1 x BC557
  • 1 x SPDT Slide Switch
  • 1 x Tactile reset switch
  • 1 x Screw terminal- (can be in blue/green colors)
  • 4 x 1K Ohm Resistor 1/4W
  • 1 x 330R Resistor 1/4W
  • 1 x 10K Ohm Resistor 1/4W
  • 1 x Bare PCB with Silkscreen Indicators
  • 1 x 9V battery connector

We may send 4 color or 5 color code resistors.

B. Components for IR transmitter module (altogether 12 components)

  • 1 x NE555 timer chip
  • 1 x 8-pin IC socket.
  • 1 x Infrared LED
  • 1 x 0.1uF 50Vceramic Capacitor - code 104
  • 1 x 0.001uF 50V ceramic Capacitor - code 102
  • 1 x SPDT Slide Switch
  • 1 x Screw terminal
  • 1 x 330R Resistor 1/4W
  • 1 x 10K Ohm Resistor 1/4W
  • 1 x 18K Ohm Resistor 1/4W 
  • 1 x Bare PCB with Silkscreen Indicators
  • 1 x 9V battery connector

We may send 4 color or 5 color code resistors.


We have sold 48pcs on Ebay, and all the customers are happy :)



Product Reviews

As we are getting few reviews for our products, we are displaying feedback from our store on Ebay. Please leave your feedback if you purchase a product from our store. Click on the image below to see all the recent feedback

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  1. Less technical kit

    Posted by Jenice Varn on 20th Dec 2016

    I could make it easily. The kit has a lot of components to get learn.

  2. made a coin counter

    Posted by Steve Brennan on 19th Dec 2016

    i made a coin counter with this kit. It was hard to counter 5 cents and 2 dollar coin. All the other coins were counted properly without any error.

  3. Incredible communication and service

    Posted by Ben on 30th Nov 2016

    the kit is great there is no doubt about it. there is something i would genuinely like to mention about build circuit team. I ordered the kit a month and didn't receive it for more than 10 days. i mailed this company and asked about its status. the company took further steps to contact Australia Post and made every updates, filed a complaint and delivered the package within the next 5 days. Because the package was delayed, the asked for a compensation from Australia post and I was paid the compensated amount. You guys are really honest and you really care for your customers.Basically, the conversation with Sagar gave me enough confidence in getting the parcel which was very important for my project. I will buy again from you and I recommend your kits to everyone. thanks.

  4. Good work

    Posted by Josi on 6th Sep 2016

    Very good design. it was fun working with this kit. thank you.
    (This comment has been imported from the previous store)

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