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Somebody kindly help me out! ( 2.3" 7segment anode LED counter up)

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Thread Starter

cholay75

Joined Jul 22, 2010
23
Hi all,
I am new user. I need 4digit manual counter up 2.3" 7segment Led common anode. Any body kindly advice me some schematic. because I couldn't effort to buy ready made circuit out there and I really need it for very urgent. I do not have knowledge about electric. So Please kindly provide me very detail of it. Thank you very much!
 
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tom66

Joined May 9, 2009
2,595
You want a 4 digit counter?

Manual increment, or some kind of external electronic trigger?

You can use a 4026 series IC.

This IC controls one display. You can then chain the counters together to get 4 displays.

You will need to be a little more specific.
 
C

Thread Starter

cholay75

Joined Jul 22, 2010
23
I just need very simple manual counter up , up to 9999. and I have 4digit of common anode which has 2.3inch, 7 segment.could you help me up with diagram including ic no and parts no.
Thanks alots for your reply and help.
 
BMorse

BMorse

Joined Sep 26, 2009
2,675
Do you want this timer to be based on discrete components or based on a microcontroller??

Here is one based on a microcontroller....




here is the hex file to program into the microcontroller.... (I had to change the extension to .txt to upload file on here, change it back to .hex once downloaded)
View attachment 3DigitCounter_hex.txt

B. Morse
 
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tom66

Joined May 9, 2009
2,595
Depends on the clock frequency. No faster than about 1 million counts per second (4 MHz / 4 cycles per instruction), if you assume 100 cycles to do one count, that's 10,000 counts per second.

I wouldn't trust the circuit posted for keeping time. The ±1% error in the internal oscillator means every hour it loses or gains around 36 seconds. Over 99.99 seconds, the milliseconds would be completely useless, as they would be overwhelmed by the error of one second. You really need a bigger PIC, because the CLKIN/OUT is needed for a crystal, and they are being used for IO.
 
BMorse

BMorse

Joined Sep 26, 2009
2,675
Have not tested it with any kind of "digital" input, I basically designed this more for a "human speed" trigger rather than electronic....

This counter maybe more suitable for some type of digital pulse input faster than human speed.... and it would not be that hard to expand the display to accommodate more digits...

Versatile Up_Down Counter.png


B. Morse
 

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BMorse

BMorse

Joined Sep 26, 2009
2,675
tom66 said:
Depends on the clock frequency. No faster than about 1 million counts per second (4 MHz / 4 cycles per instruction), if you assume 100 cycles to do one count, that's 10,000 counts per second.

I wouldn't trust the circuit posted for keeping time. The ±1% error in the internal oscillator means every hour it loses or gains around 36 seconds. Over 99.99 seconds, the milliseconds would be completely useless, as they would be overwhelmed by the error of one second. You really need a bigger PIC, because the CLKIN/OUT is needed for a crystal, and they are being used for IO.
Click to expand...

Bill was asking about the counter part, not the timer;)... but you are right, this will not be that accurate as a timer, but works well as a manual input counter....
 
C

Thread Starter

cholay75

Joined Jul 22, 2010
23
Thanks to every body,
I do have some circuit, but it could not display for 2.3" common anode led.
The voltage or ampere is not enough to lit the led. And I found this circuit but i do not have the IC No. Parts No. and circuit diagram. I have another circuit which is counter up for 4bit. but it is could not drive to 2.3" Led. And I do not want to use micro-controller and I only want is manual type.
Thanks for your helps.
 

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C

Thread Starter

cholay75

Joined Jul 22, 2010
23
here is the circuit that i tested. and display small 7segment led. it could not run 2.3" led. and I really need urgent. It may be upgradeable.
 
BMorse

BMorse

Joined Sep 26, 2009
2,675
You could also invert the outputs by using the proper transistor translator circuit (or even MOSFET's)in between to drive the LED displays with higher current...

B. Morse
 
C

Thread Starter

cholay75

Joined Jul 22, 2010
23
could you advice which transistors should i implant. and where? I think mosfet is better solution. but i just don't know how to put that switch. Thanks.
 
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