Duplicate post. 
https://groups.google.com/forum/#!topic/beagleboard/xNylvz4whSs
Please ignore.

On Saturday, October 26, 2013 2:48:24 PM UTC+5:30, Limpy wrote:
>
> Hi everyone,
>
> This is my first post in this forum.
>
> I connected BBB (running Angstrom) and ran the code in this link 
> http://beagleboard.org/Support/BoneScript/Potentiometer/ from browser. 
> Instead of a pot, there's a LDR-resistor network.
>
> Arrangement:
> Vdd_ADC 1.8V goes to a 47k resistor.
> From resistor, an LDR (9k ohms in light and around 115k in dark). Other 
> end of LDR connected to GNDA_ADC
> P9.40 (AIN1) of BBB connected between the resistor and LDR.
>
> Issue:
> On pressing the Run button, the console shows value "x.value = 
> 0.12777777777777777" when LDR is exposed to light.
> I removed the source of light (covered the LDR with finger) and pressed 
> Run button. The value doesn't change. It's "x.value = 0.12611111111111112"
> On pressing the Run button again, the value gets updated: "x.value = 
> 0.40944444444444444"
>
> The value must get updated in the second step itself, right? Why doesn't 
> it happen so?
>

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