How is "Analog In" calculated in InterfaceKit-full

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devito

How is "Analog In" calculated in InterfaceKit-full

Postby devito » Tue Dec 16, 2008 10:09 am

Hi all,

I would like to know, how is the value "Analog In" in the Phidgets InterfaceKit-full calculated from the sensor voltage? (from the image, its the value marked as 3 and highlighted in green)

Image

I needed to know so i can do some calculations with other nodes and sensors and use the same humidity formula given on the Humidity Sensor 1107 manual.

Thanks for the help.

devito

Found some answers

Postby devito » Tue Dec 16, 2008 12:55 pm

Although i still have some trouble with my conversions, i found that:

The Analog Input can measure a voltage between 0V and 5V. The analog measurement is represented in the software as a value between 0 and 1000, so a sensor value of 1 unit represents a voltage of approximately 5 millivolts. (source: http://www.phidgets.com/documentation/A ... Manual.pdf)


and:

Accuracy and Analog to Digital Conversion "I need a 32 Bit Analog to Digital conversion!" The PhidgetInterface Kit currently uses a 10 Bit analog to digital converter. This means that between 5 Volts and 0 Volts there are 1024 steps. The measured voltage is then compared to these steps and the closest "step" is given as a result. There can be a loss in accuracy depending on the size of the step. So more steps is obviously better, "that's why I want 32 Bits". (source: http://www.phidgets.com/information_dis ... ar=0&tut=6)



This helps...

fitchett
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Postby fitchett » Tue Dec 16, 2008 2:01 pm

There are actually 1000 steps between 0-5V.

Chester


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