Help with a sequence circuit?

Printed From: the12volt.com
Forum Name: General Discussion
Forum Discription: General Mobile Electronics Questions and Answers
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=20978
Printed Date: May 15, 2024 at 1:24 AM

Topic: Help with a sequence circuit?

Posted By: S.I.Autosports
Subject: Help with a sequence circuit?
Date Posted: November 04, 2003 at 1:17 AM

Hi i need help building a circuit that will flash 4 lights in sequence. what we are building is a portable tree to drag race atvs. im not worried about the sensors like at actual tracks. all i need is to be able to flip a switch, about 10 seconds later it would flash the first light, then the second, then the third, and the fourth light stay on until switched off. there needs to be about 4 seconds between each light. i plan to power it with a 12v battery.

Any help is greatly apreciated.

Replies:

Posted By: xetmes
Date Posted: November 04, 2003 at 5:57 AM

actually that circuit is easy to do, only need 2 integrated circuits, i dont know what kind of lights you want...? ill draw something up later

Posted By: S.I.Autosports
Date Posted: November 05, 2003 at 4:15 AM

i dont have the lights yet. i just planned to go to autozone and find some 12v marker lights or something of the sort. what ever is easiest.

thanks,

tim

Posted By: S.I.Autosports
Date Posted: November 07, 2003 at 2:26 PM

anyone know where on the web i might be able to find a diagram for this?

thanks,

Posted By: hotrodelectric
Date Posted: November 07, 2003 at 10:30 PM

https://www.intellitecsve.com
These guys are now owned by General Dynamics, but when I worked at Classic Limousine we bought timer modules and fade-out modules from them. They have/had a five minute timeout that I was able to wire in series with the lamp
timeout function on the >2000 Cadillac BCM to give a 15 minute-and-out 'viewing' function for the hearses. They
may have something with a variable timer you can use for your 10sec and 4sec functions.

Posted By: HotRod53F100
Date Posted: November 22, 2003 at 9:09 PM

What you need is a CD4047B multivibrator circuit or a 555 timer ic to do the stepping sequence. I'm not sure about the sequencer chip but I know that they are available with plenty of steps. Search for CD4047B on the web and you will come up with a diagram. Everything is available from your basic electronics shop or MCM Electronice via mail.

-------------
HotRod

Posted By: xetmes
Date Posted: November 23, 2003 at 7:59 AM

yea i would have done it like hotrod says, a 555 in astable feeding a 4017 decade counter, the problem becomes switching with brakes/ turn signals...

not too difficult though

Posted By: Washboy
Date Posted: November 23, 2003 at 1:10 PM

You could utilize a programmable relay. IDEC makes a device called Smartrelay. It's basically a tiny programmable logic controller allowing multiple inputs and outputs.

To build a drag racing Xmas tree, you could have it detect the staging and automatically begin the light sequence with it's random timer function. It could also be programmed to activate the red light for your ATV buddies who bust the starting light.

An IDEC Smartrelay can be purchased for about $150 but you'll also need to buy the programming software and download cable...maybe too much for your budget???

https://www.idec.com/usa/index.html