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PICList Thread
'[OT] Interlocked Pushbuttons'
1999\04\09@045836 by Michael Rigby-Jones

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Sorry for yet another [OT]...

Ok, I have 3 DPCO momentary push button switches.  I want a circuit that
will simulate an old mechanically interlocked switch assembly i.e pushing
one button will 'release' the other buttons.  A PIC is major overkill for
this and cost is a strong factor.

The output of the circuit is to drive a FET gate.  All poles of the switches
can be used.

One solution I have though of is to use a latch such as a 74HC573 and have a
switch tied to each input.  A diode OR arrangement from each switch,
possibly with a monostable, would strobe the latch.  This gives quite an
accurate simulation as it would be possible to get two button to lock down
simultaneously which is acceptable in this case.  The other advantage of
this is that I have the possibility to have up to 8 switches with one IC
package.

Any obviously better solutions spring to mind?

Regards

Mike Rigby-Jones

1999\04\09@152120 by MEDICINTEKNIK KB

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I don't know what the cost is for the 12C508 is in teh US, but I suggest you use it


Best Regards


Sven
-----Ursprungligt meddelande-----
FrŒn: Michael Rigby-Jones <spam_OUTmrjonesTakeThisOuTspamNORTELNETWORKS.COM>
Till: .....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU <PICLISTspamKILLspamMITVMA.MIT.EDU>
Datum: den 9 april 1999 10:59
€mne: [OT] Interlocked Pushbuttons


{Quote hidden}

1999\04\09@155428 by Jack Shidemantle

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Cost in US is about $1.00

{Quote hidden}

Jack Shidemantle
Automation & Development Engineer
YSI, Inc.
Yellow Springs, Ohio

1999\04\09@160845 by MEDICINTEKNIK KB

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OK

I found myself spending much time solving a small problem, when the use of a microcontroller at first seem "overkill". But flexibility to change stuff, and the low cost ao a controller, I find myself more and more seldom using "ordinary" components such as latches etc.

A PIC conuld direkt- drive your FET I suppose


Best Regards


Sven
-----Ursprungligt meddelande-----
FrŒn: Jack Shidemantle <spamBeGoneJshidemantlespamBeGonespamYSI.COM>
Till: TakeThisOuTPICLISTEraseMEspamspam_OUTMITVMA.MIT.EDU <RemoveMEPICLISTspamTakeThisOuTMITVMA.MIT.EDU>
Datum: den 9 april 1999 21:54
€mne: Re: SV: [OT] Interlocked Pushbuttons


{Quote hidden}

1999\04\09@165255 by Russell McMahon

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A PIC 16C505 (about $US0.80 in 1000 up I believe) is going to get
pretty close to any other solution in price and has the advantage of
programmability when it's "almost right" the first time.


From: Michael Rigby-Jones <RemoveMEmrjonesKILLspamspamNORTELNETWORKS.COM>
>Ok, I have 3 DPCO momentary push button switches.  I want a circuit
that
>will simulate an old mechanically interlocked switch assembly i.e
pushing
>one button will 'release' the other buttons.  A PIC is major
overkill for
>this and cost is a strong factor.
>
>The output of the circuit is to drive a FET gate.  All poles of the
switches
>can be used.
>
>One solution I have though of is to use a latch such as a 74HC573
and have a
>switch tied to each input.  A diode OR arrangement from each switch,
>possibly with a monostable, would strobe the latch.  This gives
quite an
>accurate simulation as it would be possible to get two button to
lock down
>simultaneously which is acceptable in this case.  The other
advantage of
>this is that I have the possibility to have up to 8 switches with
one IC
>package.
>Any obviously better solutions spring to mind?

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