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Voltage Input — Parallax Forums

Voltage Input

ArchiverArchiver Posts: 46,084
edited 2000-08-05 01:55 in General Discussion
I have a remote control board that outputs a 9 volt digital circuit. The
question is how can I connect this to a stamp input? My understanding is
that the max on a stamp input is 5 volts.

Thank you
Tim

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2000-08-04 11:57
    Greetings,

    On Fri, 4 Aug 2000 Trkeenan@a... wrote:

    > I have a remote control board that outputs a 9 volt digital circuit. The
    > question is how can I connect this to a stamp input? My understanding is
    > that the max on a stamp input is 5 volts.

    Yes, the input to the Stamp is TTL, 5 volt max.

    Use a voltage divider, like this:

    10k 10k
    9 volt signal
    /\/\/\/\
    +
    /\/\/\/\----
    | |
    | |
    |
    | \ \ \
    Stamp Stamp's
    Pin Ground

    By using a pair of 10k resistors, you will be dividing the 9volt signal
    in half. So the Stamp will see 4.5 volts. 4.5 volts will be a TTL logic
    'high' or '1'. Anything below ~1.4 volts will register as a logic low.

    --- Jay

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  • ArchiverArchiver Posts: 46,084
    edited 2000-08-05 01:55
    Hi Tim

    When I have a simular problem I use a 3 term. regular.
    like a LM7805 or simular. Current should not be a problem
    so you wont have to use a heat sink. Check it though to make sure.
    Hope thjis helps. ______
    | |
    | |
    | | |
    | | |
    IN GND. OUT

    Frank



    Original Message
    From: <Trkeenan@a...>
    To: <basicstamps@egroups.com>
    Sent: Friday, August 04, 2000 3:42 AM
    Subject: [noparse][[/noparse]basicstamps] Voltage Input


    > I have a remote control board that outputs a 9 volt digital circuit. The
    > question is how can I connect this to a stamp input? My understanding is
    > that the max on a stamp input is 5 volts.
    >
    > Thank you
    > Tim
    >
    >
    >
    >
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