[oopic] Re: Sharp GP2D12

Woo Hoo! I've got volts that go up and down! (Thanks Bill). So how do
I calibrate it and translate volts into something meaningful though
the OOPic?

--- In oopic@yahoogroups.com, "tinslwc" <tinslwc@...> wrote:
>
> Mike,
> I have used a GP2D15 (a digital output for specific distance) but
the
> datasheet that I have has the 12 and 15. Looking on the top of
the
> sensor, pins facing toward you, sensor facing away from you, the
pins
> are Vo, Gnd, Vcc. If you have a multimeter, you can connect +5 to
> Vcc, Ground to Ground and read the output (Vo) with you meter with
> respect to ground. You should see approximatly 2.5V with an object
> about 10 cm away from the sensor and as you move the object away,
the
> voltage shoud decay. According to my data sheet (and IR knowledge)
> you need to have a reflective object in order to get the sensor to
> work. A white sheet of paper should work fine. There does appear
to
> be some ripple in the output waveform. A small capacitor from the
> signal line to ground should clean this up. I would recommend
> something on the order of ~0.01uF. Use a ceramic cap, not
> electrolytic. If you would like the schematic/picture of what I
> used, let me know and I will get one to you. Again, I was using
the
> 15, not the 12 but the pinouts are the same.
> -Bill
> --- In oopic@yahoogroups.com, "Mike Martin" <xaviour2me@> wrote:
> >
> > Hello All (newbie question)
> > I'd like to ask two things.
> > 1)Is the diagram on http://www.oopic.com/gp2d12.htm wrong? The
> > datasheet in the sensors & detectors folder in the files section
> have
> > the pinout different to that on the oopic site (as well as the
> wiring
> > colours). If I look at mine face-on, from left to right the
wiring
> is
> > yellow/black/red for Vo/GND/Voc but the website suggests
> GND/Voc/Vc.
> > So you see, I'm having trouble figuring out if it even works.
> > 2)Also, does someone have a code snippet (or a known working
> diagram)
> > I could borrow to test it? I'm not entirely sure what to read
from
> > the IO line. What does IR.Value produce? So far all I can get out
> of
> > it is an integer value of 46. I'm using B.1.0 firmware. How can a
> > digital IOline read fluctuating voltages? Is it converted to
> varying
> > pulses? The code I'm using is below:
> >
> > 'Turns on a RED LED - fishing for a value out of the IR
> > Sub main()
> > Red.IOLine = 1
> > IR.IOLine = 3
> > Red.Value = 0
> > ooPIC.ExtVRef=0
> > IR.Operate=cvTrue
> > X = IR.Value
> > If X = 46 Then 'discovered this value by trial and error
> > Red.TurnOn
> > End If
> > Delay = 1000
> > Red.TurnOff
> > End Sub
> >
>

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