Counter&power failure

Archiver

Hello,
Counter devices should keep the last product count at power failure.I think
that can be done by:
1- Monitoring the stamp power.
2- Keep the stamp power after power fails for a time enough to save the
last count by the stamp.

Any help performing this would be appreciated.

Thank You
Mohamed Refky


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Archiver

Mohamed,

There are several ways to go about this. If it is for a commercial type
product, I would use an ADC (analog to digital converter) to monitor the
power input. Depending on how long you want to maintain power to the Stamp
after a power failure, you can use capcitors for a short time, or a battery
backup for a longer time. If you want, you can use rechargable batteries and
use the stamp to monitor thier condition and charge them when required, or
even use them sometimes to maintain their capabilities.

There are also some homebrew ways to do it. Assuming you are monitoring AC
line voltage, you could use a transformer and a rectifier to bring the
voltage down to 5VDC. Then you could directly check this on any pin of a
Stamp. If you are monitoring DC voltage then use a voltage divider instead
of a transformer as above. If the voltage varies, you can use the RCTIME or
POT commands to get a rough idea of the voltage. It depends on exactly what
you want to do, and how critical the application is.

Hope this helps,

Jonathan

www.madlabs.info

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Original Message

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From: "Mohamed REFKY" <refky@h...>
To: <basicstamps@yahoogroups.com>
Sent: Monday, May 05, 2003 11:56 AM
Subject: [noparse][[/noparse]basicstamps] Counter&power failure


> Hello,
> Counter devices should keep the last product count at power failure.I
think
> that can be done by:
> 1- Monitoring the stamp power.
> 2- Keep the stamp power after power fails for a time enough to save the
> last count by the stamp.
>
> Any help performing this would be appreciated.
>
> Thank You
> Mohamed Refky
>
>
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