Monday, December 03, 2012

BASIC ELECTRONICS PROJECT 1- 7 SEGMENT DISPLAY COUNTER / INCOMING PERSON COUNTER






Hiii…….friends this time I am here with a very interesting projects for those who have just started with electronics. With this project we can display 0-9 digits on the 7 segment and we can count the no of persons entering in the room.

Circuit diagram


Here a counter IC 7490 is  used along with BCD to 7 segment decoder IC 7447. The function of 7490 is to provide the counting value and decoder IC is decoding that value to 7 segment output . Every time when you will push the switch the clock of IC7490 will be triggered and as a result count will increase by 1 . Hence with this simple project we can display numbers 0 to 9 on seven segment display just by pressing switch. It’s a very easy circuit and you can easily implement it on a general purpose PCB.


NOW ITS TIME TO MAKE USE OF THIS CIRCUIT IN COUNTING THE NUMBER OF PERSONS ENTERING IN THE ROOM...... LETS SEE HOW….??

So  instead of using switch we will use LDR here , we will place LDR at the entry door in such a manner that the shadow of the entering person should fall directly on LDR , when shadow will fall on LDR clock of IC 7490 will be triggered and as a result the count will increase by one. Circuit wilh some small changes  is as shown. Variable resistor is used to adjust the resistance to synchronize the light intensity for better results.



COMPONENT REQUIRED


U1                  IC7490

U2                  IC 7447

R1-R7            RESISTORS 330R x7

SEVEN SEGMENT DISPLAY( common anode)

Push button

POWER SUPPLY ( 5 to9 V)

LDR and VARIABLE RESISTOR



I hope this was a interesting project and u can use it as your school project or mini project as well.  In case of any doubt, question or critical view just leave a comment.

         THNX…J
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20 comments:

  1. Anonymous1 February 2013 at 21:04

    how can your dec counter function when you only hve 1 clock input??

    ReplyDelete
    Replies
    1. Abhilash Dixit1 February 2013 at 21:34

      Hi,, friend I am not getting your question properly, will you please make it some more clear.??

      Delete
    2. Unknown31 March 2013 at 12:04

      hi.. what do you mean RV1 in the circuit diagram? and what the arrows mean in the 1k resistor?.. sory. i dont understand that part.. im a newbee...really need it...thanks.

      Delete
    3. Unknown31 March 2013 at 12:12

      hi.. what do you mean RV1 in the circuit diagram? and what the arrows mean in the 1k resistor?.. sorry, i dont understand that part.. im a newbee...i actually tried your circuit but it doesnt work...

      really need it .....thanks

      Delete
    4. Abhilash Dixit31 March 2013 at 19:04

      Hi, Chang.........RV1 is representing variable resistor of 1k as shown, and the arrow is representing middle pin of variable resistor....:)

      Delete
  2. Unknown7 March 2013 at 00:02

    what about coding???

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    Replies
    1. Abhilash Dixit7 March 2013 at 13:48

      Hi Biasa .......u dnt need any coding for this project just implement this simple circuit and it will start working.......:)

      Delete
    2. Abhilash Dixit31 March 2013 at 19:10

      and may be there is any mistake because i hv tried this circuit and its working fine, use variable resistor properly.......it will definitely work...:)

      Delete
  3. DPRCPLANET8 March 2013 at 08:42

    What if I wan to reset counter to '0' , how can I do it? thks

    ReplyDelete
    Replies
    1. Abhilash Dixit8 March 2013 at 16:27

      here we are using 7490 IC which will count from 0-9 and at tenth count it will automatically reset to 0.

      Delete
  4. Shaikh Samreen Sajid15 March 2013 at 16:34

    What if we would like to increase the display for two digit or three digit numbers. Is that possible in the above circuit?

    ReplyDelete
  5. Shaikh Samreen Sajid15 March 2013 at 16:35

    Can we increase the number of 7 segment display for two or three digit numbers? is it possible in the above circuit?

    ReplyDelete
    Replies
    1. Abhilash Dixit16 March 2013 at 04:32

      yes....of course !! using multiplexed seven segment driver ICs like MAX6950 or MAX6951....it is easily possible....:)

      Delete
    2. Unknown22 April 2013 at 07:49

      You can use two 4026 decade counter chips to accomplish this very easy. Your circuit would then only consist of 2 4026 chips, 2 seven seg displays, and 2 tact switches (one for count and one for reset. A few 1k resistors and a 100uf smoothing cap. I would add the schematic but don't see an option to do so. Feel free to email george3453@google.com.

      Have fun,

      George

      Delete
    3. Unknown16 May 2013 at 07:22

      Hey George Foster!
      Will you plz sned me your 4026 decade counter circuit that you have designed?
      my email is usamao45@yahoo.com

      Delete
  6. Anonymous21 April 2013 at 14:46

    thx for the circuit...it works well~can u show us how to build a timer circuit using four 7-segment display?

    ReplyDelete
  7. Unknown18 November 2013 at 22:01

    Can I use an IR led (in the place of torch) and an IR Sensor in the place of LDR

    ReplyDelete
  8. Unknown18 November 2013 at 22:03

    Can I change the torch with the IR Led and The LDR with LDR sensor

    ReplyDelete
  9. Unknown5 April 2014 at 14:03

    How to use the Variable resistor correctly?

    ReplyDelete
  10. Unknown5 April 2014 at 14:03

    How to use the variable resistor?

    ReplyDelete

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