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Author Topic: Delay off circuit 0 ~ 5 minutes  (Read 3409 times)
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firewalker
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« on: February 10, 2008, 10:36:00 10:36 »

Has anyone a delay off circuit with delay time from 0 to 5 minutes? Thanks you.
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kolin
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« Reply #1 on: February 10, 2008, 11:32:03 11:32 »

I would use cheap ATtiny13 with potentiometer (connected to ADC) and relay. 10min of programming in bascom. But more "conventional" is to use 555 timer. there is a lot of calculators on the web
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fichamba
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« Reply #2 on: February 10, 2008, 09:42:15 21:42 »

Hi kolin,

do you need exactly a "delayed turn on" circuit, or anyone else?.

If so, I can send you a drawing for an extremely simple delayed turn on circuit, using a mere unijunction transistor...and you can change circuit values to obtain the time you'll need, with much more than you request (0...5 minutes).

Please let me know if I can help you.

fichamba@yahoo.com
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F8B
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« Reply #3 on: February 25, 2008, 12:26:18 12:26 »

You may use 555 timer IC to generate any timing, either delayed On or Off using simple R/C components. See Fig.8 at http://www.uoguelph.ca/~antoon/gadgets/555/555.html
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mayler
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« Reply #4 on: February 25, 2008, 03:30:55 15:30 »

The Multisim 10 has already a wizard to make a Timer with 555. You put the parameters and it make the circuit.
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bogdantk
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« Reply #5 on: February 26, 2008, 09:04:54 09:04 »

Hello
I use a PIC12F629 software timer with the internal OSC (~4 MHz.).
Very simple cheap and flexible.

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shobits1
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« Reply #6 on: February 26, 2008, 11:09:10 11:09 »

you can use any timer circuit like 555, or use cheapest pic in the market it will do the work, but by using a pic you will get plenty of option since it is a program who will control the delay time and change it easly unlike using timer circuit 555 if you wanna change the delay then you must change some component.
also if you need more than one delay circuit you can use only one pic using it's output ports like multiple timers.

so like bogdantk said, using pic as delay circuit it is very simple, cheap and flexible than using a simple ciruit time.

best regards.
« Last Edit: February 26, 2008, 11:14:46 11:14 by shobits1 » Logged
jim_17
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« Reply #7 on: February 28, 2008, 10:43:20 22:43 »

Yes, you must use a 555 using R/C components but I think that making 5min delay with a Pic microcontroller is the best option . If you need help doing 5min delay with a Pic say it, then I will help you Wink.
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