rybitski Posted April 26, 2006 Report Share Posted April 26, 2006 I need something capeable of counting and displaying the number of times the IR beam is broken... I don't really know where to start... I'd like to display it on a 3 digit 7-segment led display. Is there anyway to do this with out a programer? Feedback and help is much appreciated! ;D Quote Link to comment Share on other sites More sharing options...
sundar_milo Posted April 26, 2006 Report Share Posted April 26, 2006 Hi rybitski.i think i may have answers for some of your questions.the IC 7490 is a ripple counter,which u could use it for counting.IC 7447 is a BCD to 7 segment decoder.search for its pin diagram in this site or in google.regardssundar. Quote Link to comment Share on other sites More sharing options...
sundar_milo Posted April 26, 2006 Report Share Posted April 26, 2006 here are the pin diagrams.have a nice look Quote Link to comment Share on other sites More sharing options...
rybitski Posted April 27, 2006 Author Report Share Posted April 27, 2006 Thankyou for your response, but being new into the ic world I have no idea how to wire such a thing... So maybe more of what I was asking is there anywhere I could find a schematic of such a thing? Quote Link to comment Share on other sites More sharing options...
sundar_milo Posted April 27, 2006 Report Share Posted April 27, 2006 i dont know about the schematic but i think u can find it in google.first tell us about the project you are upto.the ics i have mentioned are digital ICs .the link i have provided tells about the ics .http://www.kpsec.freeuk.com/components/74series.htm#7490 Quote Link to comment Share on other sites More sharing options...
rybitski Posted April 27, 2006 Author Report Share Posted April 27, 2006 So recently two other friends and myself took on the project of making a device that launches tenis balls. I would like some sort of counter that counts how many balls that have been shot. My concept was have the counter be able to count how many times the ir beam had been broken and display the number up to 3 digits... Unfortunatly I have no idea of where to start... I tried googleing electronis counter project and different variations and the results were always "electronis counter measure"... I'm lost. ??? Quote Link to comment Share on other sites More sharing options...
slackjack Posted April 28, 2006 Report Share Posted April 28, 2006 Well if you need a counter to count 3 digits, I would use a cascaded decade counters. One decade counter per digit, therefore I need 3 decade counters for 3 digits. The 3 decade counters allow me to count 1000 different states (0-999). The output is usually in binary form. To make it more readable i.e. decimal, you would need to feed the outputs of each decade counter to a BCD (Binary to Decimal Decoder) chip. From here the output of the BDC goes into a 7 segment LED display.Keep in mind that each decade counter needs its own BCD decoder chip and each BCD decoder chip needs its 7 - segment LED display.As for the which IC chip to use for the decade counter, I'm not sure. I usually make my own decade counters from cascaded JK flip flops(4 flip flops per counter). Mayb if you search google for decade counter IC chips, you may find a suitable one to purchase.If you do decide to use the above method for a counter, you should look up the pin configurations for the 7-segment LED and try to figure out how to carry the signal from the BCD to the 7 segment. Usually (on the BCD) upper case letters are for the inputs from the decade counter and lower case letters are outputs to the 7 segment LED.sundar_milo's suggestion on using the ripple counter is also a good way to go. The same principles of BCD to 7 segment still apply. Quote Link to comment Share on other sites More sharing options...
sundar_milo Posted April 28, 2006 Report Share Posted April 28, 2006 Hey i have found a way to solve your problem of counting ,displaying in 3 digit display.It uses 3 IC 74160(counter), 3 IC 7485 (4-bit magnitude comparator ), 3 BCD to 7 segment display decoder(IC 7447) and an inverter (IC 7404). The circuit is somewhat complicated for me to draw but i will try to post the circuit diagram(schematic) within 2-3 days.But u have to provide the output of the IR to this circuit . i hope it is about +5v so that it could drive the counter circuit.Regardssundar :D Quote Link to comment Share on other sites More sharing options...
rybitski Posted April 29, 2006 Author Report Share Posted April 29, 2006 Thank you very much! ;D Quote Link to comment Share on other sites More sharing options...
sundar_milo Posted May 4, 2006 Report Share Posted May 4, 2006 hi im very sorry to post this late. :-[just look at this pic and say what u think. Quote Link to comment Share on other sites More sharing options...
rybitski Posted May 4, 2006 Author Report Share Posted May 4, 2006 Thank You very much! It doesn't look as complicated as I thought it might be. So how much would this cost in parts? Quote Link to comment Share on other sites More sharing options...
shobhitkukreti Posted May 5, 2006 Report Share Posted May 5, 2006 Guyz using the ttl ic's is fine .. y dont u se use .. cmos is cd4033 .. it has a decade counter as well as the o/p for 7 seg dislpay built in an 16 dip ..wud'nt that reduce the complexity of the design Quote Link to comment Share on other sites More sharing options...
sundar_milo Posted May 6, 2006 Report Share Posted May 6, 2006 i dont know where you are from rybitski.but in dollars it would cost within 10 or 15 ithink(only the ic's).including others it might go upto $30 or so. Quote Link to comment Share on other sites More sharing options...
rybitski Posted May 6, 2006 Author Report Share Posted May 6, 2006 I live in eastern US. Other stuff being sodd, board, and resistors? I have all of that stuff lying around... Quote Link to comment Share on other sites More sharing options...
rybitski Posted May 6, 2006 Author Report Share Posted May 6, 2006 Thank you again for all of your help, I really appreciate it! where would you recomend buying the ICs from, any particular website? Quote Link to comment Share on other sites More sharing options...
sundar_milo Posted May 6, 2006 Report Share Posted May 6, 2006 i think u would need the following componentscommon anode 7 segment display - 3IC 74160 - 3IC 7447 - 3IC 7485 - 3IC 7400 - 1Resistors 330 ohm - 21.I doubt that some more resistors are needed for grounding and other purposes.i think we need some others' help to do the resistors job.If you are clear with my circuit diagram then make up a computer aided schematic.post it here and may be we can ask help from experts like "audioguru" , "ante" , etc.,send them personal messages so that they could give some good idea about the circuit.i recommend www.maxim-ic.comwww.ti.com ,etc., try googling . i always buy chips directly not by online. Quote Link to comment Share on other sites More sharing options...
sundar_milo Posted May 6, 2006 Report Share Posted May 6, 2006 i also recommend you first create a pcb design using computer after making a scematic.and then u would have to print the board . for this design u need some pcb creator programs like express pcb,eagle layout editor.Eagle editor is the best one from user comments.but before everything we must contact experts for thier suggestion.dont even proceed to buy chips. just make a schematic first. Quote Link to comment Share on other sites More sharing options...
allvol Posted May 7, 2006 Report Share Posted May 7, 2006 Hi Chris,I have jotted down some connections for counters that work for me. Quote Link to comment Share on other sites More sharing options...
rybitski Posted May 7, 2006 Author Report Share Posted May 7, 2006 So If I would use bianary the circuit would look something like this??(attached)How does a binary display work (how do you read it)?I like this design more because it is alot simpler.Sundar said that I would need a signal inverter because of how I was going to use the counter. Is it still needed?Thank you soo much for all of you guy's help so far!When I get sometimes I'm going to draw out sundar's circuit... Becasue I would really rather have the 7 segment display... Quote Link to comment Share on other sites More sharing options...
allvol Posted May 7, 2006 Report Share Posted May 7, 2006 Yes, Chris. Quote Link to comment Share on other sites More sharing options...
rybitski Posted May 8, 2006 Author Report Share Posted May 8, 2006 Yes, I am familiar with the 555...Where would you recomend buying these components (not the 55 I have one of those)? Would you happen to have a few lying around? Quote Link to comment Share on other sites More sharing options...
allvol Posted May 8, 2006 Report Share Posted May 8, 2006 Hi Chris,Lately I have been buying my components from www.futurlec.com Quote Link to comment Share on other sites More sharing options...
rybitski Posted May 9, 2006 Author Report Share Posted May 9, 2006 Futurlec.com is AWESOME! I was surprised at how cheap everything was and how cheap shipping was... Thank you for telling me about it!I spent $20 and got a bundle of goodies... Quote Link to comment Share on other sites More sharing options...
rybitski Posted May 9, 2006 Author Report Share Posted May 9, 2006 Thank you for your time and responses! I have ordered the 74LS90's an according to the site should be here in 1-2 weeks according to the site. The counter part is designed, but I'm still not entirely sure how to make the imput part.For everytime the IR beam is interupted the count should increase by one. I will attach a diagram of what I need. Quote Link to comment Share on other sites More sharing options...
allvol Posted May 9, 2006 Report Share Posted May 9, 2006 Hi Chris,Glad you are happy with Futurlec. Quote Link to comment Share on other sites More sharing options...
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