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Subject: Re: AW: AW: AW: AW: Still Problems with AJB Remote

Re: AW: AW: AW: AW: Still Problems with AJB Remote

From: [IDC]Dragon <idc-dragon_at_gmx.de>
Date: Wed, 14 Jul 2004 22:19:44 +0200 (MEST)

Hello Matthias,

forget overblown PSpice (there must be some user error), do the circuit with
the diode and the resistor, close the thread. It will work, regardless of
internal pullup or not, trust me. (I'm an electrical engineer by
profession.)
                                     +5V
                                      |
                                      |
                                     +-+
                                     | |10k
                                     | |
                                     +-+
                                      |
                                      |
                        Schottky |
       uC Out port--------|<|---------+-- AJB remote

It will probably work with a regular diode as well (~0.6V forward voltage),
but a Schottky will give the better low (~0.3V). A "low" must be below 0.8
V, any lower improves noise margin.

Jörg

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Received on 2004-07-14

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