[oopic] Re: Cadmium CDS (oCdS)

I got it working! Thanks mate. Still don't know what the problem was.

Anyway.. I get a nice positive range from 0 to 120 when i shine light
on it. The problems begin when I go into the negative range. As you
can see from my program, I'm saving the value of light intensity in B,
which is defined as an OByte object. It has a range of 0-255.

I don't remember much about negative binary numbers, but I'm quite
sure that any value over 128 is negative.

I changed the program to print a minus sign whenever I.Level is less
than 0, but I get things like -200 or -250.

My problem: How to take the magnitude of an oByte number?

--- In oopic@yahoogroups.com, "dan michaels" <oric_dan@...> wrote:
>
> --- In oopic@yahoogroups.com, "teh_gamr" <ashraf.hammoud@> wrote:
> >
>
>
> With a CdS cell, all you need do it connect it up in a voltage
> divider to 5v, using a 10K or so resistor for a pullup, and then
> connect the v.div output to any A/D converter channel on the oopic.
>
> If you're using one of the oopic sample programs, you first need to
> double check the sensor is connected to the same I/O line as the
> program uses. Not connected to the correct pin is the most common
> mistake people make.
>
> - dan michaels
> www.oricomtech.com
> -- OOBOT40 Boards ---
> ========================
>
>
> > Hello,
> >
> > I'm trying to use a CdS cell with my oopic. I'm certain that I've
> > done the wiring correctly, it's quite simple.
> >
> > http://oopic.com/ocds.htm

has the following sample program:
> >
> > "I As oCdS(1,0,cvOn)
> > P As oDIO8(3,cvOutput)
> >
> > 1:
> > P.State = I.Level
> > Goto 1"
> >
> > Using this as a reference, I tried outputing the i.level value to
> an
> > LCD:
> >
> >
> >
> > "LCD As oLCD(3,1,27,26,cvOn)
> > b As oByte
> > I As oCdS(1,0,cvOn)
> > I.IOLine = 14
> > LCD.Init
> > LCD.Clear
> > LCD.Locate(0,0) ' Locate cursor at 2nd row, 3rd column.
> >
> >
> > Do
> > LCD.Locate(0,0)
> > b = 0
> > b = I.Level
> > LCD.VString = Str$(b)
> > Delay = 500
> > Loop
> > "
> >
> >
> > I get "00154" or "00153" on the LCD. The value varies +-1.
> >
> > Shining or turning off the light makes no difference. I tried using
> > another cell, same results.
> >
> > Some clue as to what could be wrong: removing the cell or
> > disconnecting it from the i/o line makes no difference.
> > Im certain the wiring is right.. Could it be the program?
> >
> >
> >
> > Thanks in advance
> >
>

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