Sharp GP2D15 adjustment ?

Archiver

All,

I would like to increase the detection point on the Sharp IR
sensors from the factory set value of 23cm (~9in) to the maximum of
about 80cm (~31in). I seem to recall reading the procedure for doing
this adjustment, but I am unable locates it now that I need it.
Sharp recommends that I use the GP2D12 but this would require that I
use a comparator and I would prefer to not add additional circuitry.

Can some one please point me to the procedure?

Thanks,
Phil

Archiver

You might try adjusting the IR requency. In playing with my own I found that
moving the frequency either side of 38KHz has a pronounced effect on the
range.

Sid

Archiver

> I would like to increase the detection point on the Sharp IR
> sensors from the factory set value of 23cm (~9in) to the maximum of
> about 80cm (~31in). I seem to recall reading the procedure for doing
> this adjustment, but I am unable locates it now that I need it.
> Sharp recommends that I use the GP2D12 but this would require that I
> use a comparator and I would prefer to not add additional circuitry.
>
> Can some one please point me to the procedure?
>

The GP2D15 is the non-adjustable version of the GP2D05. The GP2D05 has
the comparator built-in and a small pot on the back to adjust the trigger point.

I would think that there is a surface-mount resistor (or 2) on the board that
could, theoretically, be changed to set a new trigger-point but Sharp does
not release info on the component-level of their products.

Depending on what your time is worth to you, you're better-off getting the
GP2D05.

We carry this item as a complete kit with the speacial cable and a mounting
bracket and all hardware -and a manual, of course.

http://www.hvwtech.com/sensors.htm


Mark Hillier, VE6HVW
President, HVW Technologies Inc.
Canadian Distributors of Parallax Products and other Neat Stuff
Tel: (403)-730-8603 Fax: (403)-730-8903
See our NEW BASIC Stamp Prototyping tools !
http://www.hvwtech.com/stampstack.htm

Archiver

Ive used the GP2D02's with a BS2sx and had great luck. I got them from
Acroname, who seems to have pretty good prices and great documentation, not
to mention providing the proper connector and wires. They also carry the
other Sharp modules as well as the Devantech ultrasonic sensor.

GP2D02 -- http://www.acroname.com/robotics/parts/R19-IR02.html
GP2D05 -- http://www.acroname.com/robotics/parts/R21-IR05.html
GP2D12 -- http://www.acroname.com/robotics/parts/R48-IR12.html
GP2D15 -- http://www.acroname.com/robotics/parts/R49-IR15.html

---

Original Message

---

> > I would like to increase the detection point on the Sharp IR
> > sensors from the factory set value of 23cm (~9in) to the maximum of
> > about 80cm (~31in). I seem to recall reading the procedure for doing
> > this adjustment, but I am unable locates it now that I need it.
> > Sharp recommends that I use the GP2D12 but this would require that I
> > use a comparator and I would prefer to not add additional circuitry.
> >
> > Can some one please point me to the procedure?
> >
>
> The GP2D15 is the non-adjustable version of the GP2D05. The GP2D05 has
> the comparator built-in and a small pot on the back to adjust the trigger
point.
>
> I would think that there is a surface-mount resistor (or 2) on the board
that
> could, theoretically, be changed to set a new trigger-point but Sharp does
> not release info on the component-level of their products.
>
> Depending on what your time is worth to you, you're better-off getting the
> GP2D05.

Archiver

Sid,

What would I need to adjust to alter the frequency?

Phil

--- In basicstamps@y..., Newzed@a... wrote:
> You might try adjusting the IR requency. In playing with my own I
found that
> moving the frequency either side of 38KHz has a pronounced effect
on the
> range.
>
> Sid

Archiver

Mark,

According to Sharp, they are no longer producing the D05 and are
selling the D15 as its replacement. (Apparently they had some
manufacturing problems with the D05.) The D15 also does not require
a CLK input as it is self-triggering, which simplifies the
interconnect but means that a method of preventing false triggers
should be implemented.

Thanks for the information,
Phil
N6MWC
--- In basicstamps@y..., "Mark Hillier" <Mark@H...> wrote:
>
> > I would like to increase the detection point on the Sharp IR
> > sensors from the factory set value of 23cm (~9in) to the maximum
of
> > about 80cm (~31in). I seem to recall reading the procedure for
doing
> > this adjustment, but I am unable locates it now that I need it.
> > Sharp recommends that I use the GP2D12 but this would require
that I
> > use a comparator and I would prefer to not add additional
circuitry.
> >
> > Can some one please point me to the procedure?
> >
>
> The GP2D15 is the non-adjustable version of the GP2D05. The GP2D05
has
> the comparator built-in and a small pot on the back to adjust the
trigger point.
>
> I would think that there is a surface-mount resistor (or 2) on the
board that
> could, theoretically, be changed to set a new trigger-point but
Sharp does
> not release info on the component-level of their products.
>
> Depending on what your time is worth to you, you're better-off
getting the
> GP2D05.
>
> We carry this item as a complete kit with the speacial cable and a
mounting
> bracket and all hardware -and a manual, of course.
>
> http://www.hvwtech.com/sensors.htm
>
>
> Mark Hillier, VE6HVW
> President, HVW Technologies Inc.
> Canadian Distributors of Parallax Products and other Neat Stuff
> Tel: (403)-730-8603 Fax: (403)-730-8903
> See our NEW BASIC Stamp Prototyping tools !
> http://www.hvwtech.com/stampstack.htm

Archiver

> Mark,
>
> According to Sharp, they are no longer producing the D05 and are
> selling the D15 as its replacement. (Apparently they had some
> manufacturing problems with the D05.)

Actually, the 05 is still available; but they are pushing customers towards
other products by imposing large minimums. We haven't heard about any
manufacturing problems.

The D15 also does not require
> a CLK input as it is self-triggering, which simplifies the
> interconnect but means that a method of preventing false triggers
> should be implemented.

We've seen them (even have a few) but we don't carry them because they
can't be adjusted.


Mark Hillier, VE6HVW
President, HVW Technologies Inc.
Canadian Distributors of Parallax Products and other Neat Stuff
Tel: (403)-730-8603 Fax: (403)-730-8903
See our NEW BASIC Stamp Prototyping tools !
http://www.hvwtech.com/stampstack.htm