NI Home
Cart Cart | Help
Hello Events Academic NI Developer Zone Support Solutions Products & Services Contact NI MyNI
You are here: 
 NI Home > NI Developer Zone > NI Discussion Forums

Counter/Timer

turn on suggestions Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Reply
Topic Options
Member Owcalex
Member
Owcalex
Posts: 1
0 Kudos

Countdown timer project help

Options

‎07-03-2012 09:52 PM

I am designing a 30 minutes countdown timer with a LDR in the circuit.

So far i can`t even achieve a simple countup timer from 0-9 , please help.

 

Clock pulse (Astable multivibrator)- 555 timer circuit

4 bit counter wired as MOD 10 74LS293N

74LS47N Decoder 

LED common anode.

Attachment Simple countup 0-9 counter.ms10 ‏128 KB
Message 1 of 2 (391 Views)
 
Reply
Member SQYARE
Member
SQYARE
Posts: 1
0 Kudos

Re: Countdown timer project help

Options

‎01-02-2013 09:25 PM

It seems that your 555 timer isn't counting, I hooked up an oscilloscope to it to see what it was generating

Attachment Simple countup 0-9 counter.ms11 ‏353 KB
Message 2 of 2 (229 Views)
 
Reply
By using this web site, you accept the Terms of Use for this web site. Please read these Terms of Use carefully before using any part of this site. Please go here for information on ni.com's copyright infringement policy.
My Profile | Privacy | Legal | Contact NI © 2011 National Instruments Corporation. All rights reserved.    |    E-Mail this Page E-Mail this Page