newbie wants to monitor 32v device

Archiver

I have an old boat w/a 32v belt driven refrigerator compressor that I
recently rebuilt. The unit runs for about 12-14 minutes until it
reaches the desired temp then can go as long as 27 minutes before
restarting (that has been the average, with the outdoor temperature
rising the performance is impacted.)

I'd like to monitor the number of times and the length of time
between runs. I know there is probably a way to stick a basic stamp
project inline and track this performance but do not know where to
start. any gurus that can help point me in a direction?

Any help will be greatly appreciated.

Stan

I'd eventually like to apply the principles of this first project to
monitor the bilge pump too.

Archiver

Assuming its 32vDC, the simplest way would be to attach a transistor to the
32V line. Wire one side of it to the stamp and a 10k pullup. The other side
to ground. When the 32V powers up, the transistor opens the gates and your
stamp pin goes low. You can get fancy and stick an optocoupler in there
somewhere for safety too.

If its 32vAC then its a different kettle of fish. Hall effect device (cheap)
or an I/O module ($$$$), or a relay. Don't know much about interfacing AC.


This is assuming the 32V is DC of course... If its

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Original Message

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From: "Stan D. Smith" <designerx2@y...>
To: <basicstamps@yahoogroups.com>
Sent: Tuesday, July 08, 2003 8:02 PM
Subject: [noparse][[/noparse]basicstamps] newbie wants to monitor 32v device


>
> I have an old boat w/a 32v belt driven refrigerator compressor that I
> recently rebuilt. The unit runs for about 12-14 minutes until it
> reaches the desired temp then can go as long as 27 minutes before
> restarting (that has been the average, with the outdoor temperature
> rising the performance is impacted.)
>
> I'd like to monitor the number of times and the length of time
> between runs. I know there is probably a way to stick a basic stamp
> project inline and track this performance but do not know where to
> start. any gurus that can help point me in a direction?
>
> Any help will be greatly appreciated.
>
> Stan
>
> I'd eventually like to apply the principles of this first project to
> monitor the bilge pump too.
>
>
>
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Archiver

Hi Stan,

How about monitoring the temperature in the refrigerator? That would
not require any direct connection to the compressor. Monitor outdoor
temps too while you're at it! Vibration of the compressor might be
another non-invasive signal of operation.

As to the time measurement, the easiest approach is to add a real
time clock chip to the BASIC Stamp, so you can simply keep a record
of the times of events.

-- Tracy


>I have an old boat w/a 32v belt driven refrigerator compressor that I
>recently rebuilt. The unit runs for about 12-14 minutes until it
>reaches the desired temp then can go as long as 27 minutes before
>restarting (that has been the average, with the outdoor temperature
>rising the performance is impacted.)
>
>I'd like to monitor the number of times and the length of time
>between runs. I know there is probably a way to stick a basic stamp
>project inline and track this performance but do not know where to
>start. any gurus that can help point me in a direction?
>
>Any help will be greatly appreciated.
>
>Stan
>
>I'd eventually like to apply the principles of this first project to
>monitor the bilge pump too.