INPUT PROTECTION FOR UNIVERSAL INTERFACE

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nickmodelmaker
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Joined: Mon Mar 03, 2008 9:07 pm

INPUT PROTECTION FOR UNIVERSAL INTERFACE

Post by nickmodelmaker » Tue Mar 04, 2008 8:53 am

HELLO !

I AM TRYING TO BUILD A SIMPLE DYNAMOMETER FOR MY 50cc ROADRACING BIKE USING A VELLEMAN K8055 UNUVERSAL INTERFACE.

I WANT TO READ THE SPEED OF THE ENGINE BY MEASURING THE PULSES ACROSS THE IGNITION COIL / CONTACT POINTS ( LOW TENSION 12v SIDE ).

ESSENTIALLY I NEED AN OPTICALLY ISOLATED SWITCH TO CONNECT TO THE INTERFACE, TO PROTCT THE INTERFACE AND COMPUTER FROM ANY POTENTIAL SPIKES ON THE INPUT.

IN ANY CASE THE INPUT REQUIRES A SWITCH WHICH WHEN CLOSED PULLS THE CONNECTON TO GROUND.

THE SWITCH WOULD HAVE TO OPERATE AT ABOUT 250Hz MAXIMUM I THINK ( THE ENGINE COULD POTENTIALLY RUN AT 15,00 RPM ITS A TWO STROKE SO FIRES EVERY REV SO THATS 15,000 / 60.....I THINK ?)

ANYONE HAVE ANY IDEAS FOR THIS ?

I'D NEED VALUES FOR THE COMPONENTS AS I'M A BIT OF A NUMBSKULL ELECTRONICS WISE ( MECHANICAL ENGINEER YOU SEE !! )

ANY HELP MOST APPRECIATED

KINDEST REGARDS NICK TOLHURST
P.S. ACTUALLY AS A THOUGHT, A UNIVERSAL INPUT PROTECTION MODULE FOR THE K8055 WOULD BE VERY HANDY IF ANYONE FANCIES A BIT OF A PROJECT

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