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From: Jan Panteltje <alien@comet.invalid>
Newsgroups: sci.electronics.design
Subject: Re: IR detector system, biasing of photo diode
Date: Mon, 28 Oct 2024 11:22:10 GMT
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On a sunny day (Mon, 28 Oct 2024 11:17:56 +0100) it happened Klaus Vestergaard
Kragelund <klauskvik@hotmail.com> wrote in <vfnocj$uluj$3@dont-email.me>:

>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.

You could put a RF transmitter in the thing,
and measure for maximum signal with 2 separated receivers, like ham radio fox hunt,
 https://en.wikipedia.org/wiki/Transmitter_hunting
then send the steering signal to the mobile thing via radio.
Or use 2 transmitters and steerable antenna on the moving thing.,
Bit of luck and yuo could use local radio stations...
And at night use the stars.... :-) If it is not cloudy..
My camera modules are Sony super HADs, ultra low light ones....
 https://www.ebay.com/itm/166096040231?
analog video out, makes it very easy to process with with a Microchip PIC 18F14K22
but I grew up with analog video.....

There is  lot more to it..
These days with a simple Raspberry and a digital camara module in daylight object recognition is possible:
 https://core-electronics.com.au/guides/object-identify-raspberry-pi/
Have not triad that.
Seems fun :-)