Re: TI-H: Reading 12 volt pulses

To: ti-hardware@lists.ticalc.org
Subject: Re: TI-H: Reading 12 volt pulses
From: Grant Stockly <gussie@stockly.com>
Date: Sun, 25 Jun 2000 12:53:40 -0800
In-Reply-To: <Pine.LNX.4.04.10006131133150.22054-100000@genesis.genetech.net>
Reply-To: ti-hardware@lists.ticalc.org


Signal -----+
            |
            / 7ohm
            \
            /
            |
            +--- To calculator
            |
            /
            \ 5 ohm
            /
            |
Ground -----+

I used this as a signal regulator for car equipment.

>From: <tonypowell@att.net>
>> What would be the simplest way to count 12 volt pulses
>> with my '86?  I believe the link is not analog so I
>> would think it'd have to be some sort of external
>> hardware setup.
>
>An optoisolator would work, its essently an led and
>photosensitive transistor together in a single chip.
>They are good for isolating your electronics from
>the 'real world' while safely receiving input signals.
>Even if there is an overvoltage on the input side
>the calculator will be protected.
>
>dk

References:

TI-H: Reading 12 volt pulses

From: David Knaack <dknaack@genesis.genetech.net>

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