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DPRG: BOUNCE dprglist@dprg.org: Non-member submission from [Brynn Rogers <brynn@tiny.net>]

Subject: DPRG: BOUNCE dprglist@dprg.org: Non-member submission from [Brynn Rogers <brynn@tiny.net>]
From: Jim Brown brownjim at airmail.net
Date: Fri Nov 19 19:38:35 CST 1999

>Date: Fri, 19 Nov 1999 12:40:23 -0600
>From: owner-dprglist at dprg.org
>To: owner-dprglist at dprg.org
>Subject: BOUNCE dprglist at dprg.org:    Non-member submission from [Brynn
Rogers <brynn at tiny.net>]   
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>Message-ID: <3835A76F.16506A1C at tiny.net>
>Date: Fri, 19 Nov 1999 13:39:27 -0600
>From: Brynn Rogers <brynn at tiny.net>
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>To: ElectroDFW at cs.com
>CC: DPRGlist at dprg.org, tcrobots at orbis.net, robots at rzsoft.com,
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>Subject: Re: Circuit Needed!
>References: <0.c917acb.2565f4aa at cs.com>
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>ElectroDFW at cs.com wrote:
>> 
>>     Hello All,
>> 
>> I need a schematic of components that when a button is pushed, or a switch
>> depressed, by a mechanism, it will only allow the motor to go in the
>> direction other than which it is turning.  I know how to do a motor cutoff
>> switch, but I want it to only be able to reverse until the switch is no
>> longer pressed, and I don't know how to wire something that way... No
>> software solutions, please. I want this hardwired.
>
>
>The simple solution (with a gotcha) is this:
>
>
>a DPDT (double pole double throw) momentary contact push button will do
>what you asked, 
>but it may not be what you want.
>
>   _________________o 1      4 o
>   |                 \        /
>   |                  \      /
>   |                   \    /
>  / \                   \  /
> | motor    - (Gnd)_o 2  \/  5 o____ + (Vcc)
>  \ /                    /\ 
>   |                    /  \
>   |                   /    \
>   |                  /      \
>   |                 /        \
>   _________________o 3      6 o 
>
>
>pins 1-6 are the DPDT switch, 2 and 5 are the common terminals
>
>
>
>This will run the motor out to the limit switch, when it is hit, reverse
>it.
>then the switch will switch again and the motor will run the other way.
>
>Of course unless you have something else controlling this the motor will
>oscillate around
>the opening and closing of the switch, possibly stopping with the switch
>in a half-way 
>position that has no connections made.
>
>a special type of switch called a make-before-break will short out your
>power source if used like this.
>(Those are rare)
>
>Brynn
>-- 
>http://www.visi.com/~brynn to see my triplets !
>
>
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jim_brown at bigfoot.com jbrown at dprg.org http://www.cyberramp.net/~jbrown
Cole's Law:  Thinly Shreaded Cabbage

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