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From: Klaus Vestergaard Kragelund <klauskvik@hotmail.com>
Newsgroups: sci.electronics.design
Subject: Re: IR detector system, biasing of photo diode
Date: Mon, 28 Oct 2024 11:17:56 +0100
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On 27-10-2024 20:06, Don Y wrote:
> On 10/27/2024 7:33 AM, Klaus Vestergaard Kragelund wrote:
>> On 27-10-2024 14:05, Don Y wrote:
>>> On 10/26/2024 5:19 PM, Klaus Vestergaard Kragelund wrote:
>>>> I am working on an IR detector that will guide a robot into a 
>>>> docking station.
>>>>
>>>> A IR transmitter on the docking station transmits a beam, and 2 IR 
>>>> detectors on the robot detects the beam and lets the robot navigate 
>>>> towards the target. The working distance is a couple of meters.
>>>
>>> Can the robot ALWAYS see the docking station?  What happens if an
>>> obstacle (wall?) comes between the two?
>>
>> Yes, we have RTK GPS to position it within a cm at a location right in 
>> front of the docking, 2 meters away.
> 
> Then why can't you move to the GPS location of the dock with the
> same degree of accuracy?
> 

The docking station is typically in a shed, or close to a building where 
the GPS signal disappears.

>>> Can either device (robot/dock) ever slip out of the shared plane?
>>
>> No, should be locked
> 
> "Outdoors" (from below).  Presumably on pavement/concrete (not a "lawn")
> that wouldn't have dips and bumps?
> 

It's moving on grass, and can have bumps etc, so for IR the lope needs 
to be perhaps 20degrees to avoid loss of signal

>>> Can the docking station be moved, from day to day, site to site, etc.?
>>
>> That is fixed
>>
>>> Is the arena indoors?
>>
>> Outdoors
>>
>>> I have become particularly fond of using cameras to interface with
>>> the real world.  Of course, it requires a bit more horsepower but
>>> seems to be able to overcome all of the issues that have crept up...
>>
>> That's also a solution we have been working on. The Worx Vision uses that
>>
>> https://eu.worx.com/da-dk/landroid/vision-technology/
>>
>> That is for a future version. Cameras can also be blinded, lenses 
>> needs to be cleaned etc
> 
> Yes, but a camera can be "queried" to verify that it is functioning
> correctly:  "What do you see?  Is it THIS?"
> 
> I test my cameras by storing previously viewed scenes to verify they
> are still "reasonably" intact.  Ideally, I would move something into
> the field of view but that requires additional capabilities.
> 
> You, however, could move the robot (assuming IT has the eyes) and
> verify that the scene changes accordingly.
> 

Could be done. The guys in charge are worried with change of 
environment, so what happens when it snows heavily, fog or other 
surroundings changing effects.