Setpoints with pushbutton

Archiver

We have a programmable model RR turntable that uses the eprom READ/WRITE
instructions for non-volatile angle positions.

Ray McArthur

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Original Message

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From: Mohamed REFKY <refky@h...>
To: <basicstamps@egroups.com>
Sent: Tuesday, May 16, 2000 5:29 PM
Subject: [noparse][[/noparse]basicstamps] Setpoints with pushbutton


> Hello Group,
> I have BS2 & MAX7219 LED driver to display data.How can I use pushbuttons
to
> program non-volatile 1 or 2 setpoints that can be read by the program
> instructions to switch a load.Any idea would be appreciated.

Archiver

Hello Group,
I have BS2 & MAX7219 LED driver to display data.How can I use pushbuttons to
program non-volatile 1 or 2 setpoints that can be read by the program
instructions to switch a load.Any idea would be appreciated.

Thank You
Mohamed Refky
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Archiver

>I have BS2 & MAX7219 LED driver to display data.How can I use pushbuttons
to
>program non-volatile 1 or 2 setpoints that can be read by the program
>instructions to switch a load.Any idea would be appreciated.
>Thank You
>Mohamed Refky

There are several ways to go about it.

1) when the system arrives at its setpoint, you press a button and the
system "learns" that setting. Kind of like cruise control on a car, where
you bring it up to the desired speed and then press a button to to maintain
that speed automatically. Or, like pH calibration, wherre you first put
the pH probe in a neutral pH 7 solution and press one button, and then you
put it in an acid pH4 solution and press another button, setting the offset
and the slope.

2) Buttosn step you "up" or "down" through a relatively small set of
allowable values one by one. When you see the one you want on your display,
you press the "set" button. That is how a lot of thermostats are
programmed.

3) the alarm clock model, where you press buttons in the right combinations
and in the right order to set the individual digits or units of each
setpoint. Sometimes involves a hunt for the instruction book!

4) Then there is a full keypad, but I guess that by "pushbuttons" you mean
something less than that.

I have no idea what approach would be appropriate for your application. It
is one of those "need more information" questions.

-- Tracy Allen
Electronically Monitored Ecosystems
http://www.emesystems.com