Path: ...!3.eu.feeder.erje.net!feeder.erje.net!weretis.net!feeder8.news.weretis.net!reader5.news.weretis.net!news.solani.org!.POSTED!not-for-mail From: Jan Panteltje Newsgroups: sci.electronics.design Subject: Re: IR detector system, biasing of photo diode Date: Mon, 28 Oct 2024 11:22:10 GMT Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; ISO-8859-15 Content-Transfer-Encoding: 8bit Injection-Date: Mon, 28 Oct 2024 11:22:11 -0000 (UTC) Injection-Info: solani.org; logging-data="166668"; mail-complaints-to="abuse@news.solani.org" User-Agent: NewsFleX-1.5.7.5 (Linux-5.15.32-v7l+) Cancel-Lock: sha1:lUvNAaccpNSaRNS1LClp/RItuvg= X-User-ID: eJwFwQcBADAIAzBLvJYhZwf8S1gCp/JmEAwMJpMycJvy5isQ4RajWXn3c+1QsX3XOdYwPkhbQrBsQYv5ASh7E/M= X-Newsreader-location: NewsFleX-1.5.7.5 (c) 'LIGHTSPEED' off line news reader for the Linux platform NewsFleX homepage: http://www.panteltje.nl/panteltje/newsflex/ and ftp download ftp://sunsite.unc.edu/pub/linux/system/news/readers/ Bytes: 4936 Lines: 90 On a sunny day (Mon, 28 Oct 2024 11:17:56 +0100) it happened Klaus Vestergaard Kragelund wrote in : >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 :-)