This Forum is Dedicated For all The Object Oriented PIC Lovers .......... The concept behind OOPic is straight forward. Use preprogrammed multitasking Objects from a library of highly optimized Objects to do all the work of interacting with the hardware. Then write small scripts in Basic, C, or Java syntax styles to control the Objects. During operation, the Objects run continuously and simultaneously in the background while the scripts run in the foreground telling the objects what to do.

Thursday, August 23, 2007

[oopic] Re: Signal levels for a2d objects

>
> When you say 'differential' are you implying the output comes on two
> leads independent of ground? Or is this just a single output that
> varies between 3 mV and 50 mV?

Yes, there are two output leads that seem to be independent of
ground. Both the positive and negative output leads seem to be ~2.5
volts from both gnd and +5.

> How about a link to the sensor datasheet?

Sure. It's an AST Sensors 4100.

Overview: http://www.astsensors.com/ast4100.html
Specs: http://www.astsensors.com/ast4100.html

It comes in different output configurations, which their site lists
as either:

10mV/V
0.5 - 4.5v ratiometric
1-5v
1-6v
.25-5v
or 4-20ma

(The higher voltage outputs would probably have been a better choice,
but new these sensors cost about twice as much as what I paid for
this one on ebay.)

The ebay listing and the label on the sensor however list it as
3mv/V, which is an option I don't see listed on the spec sheet.
However, they do seem to make them in various custom configurations
which this could have been.

(as a side note, any idea of what exactly a notation such as 3mv/V or
10mv/V indicates? Something like 0-50mv I understand, but not sure
what 3mv/V is trying to convey)

Thanks,
Mike


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