Subject:
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Questions about sensors
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 20 Oct 1998 17:18:36 GMT
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Original-From:
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Eric Noyau <noyau@/NoMoreSpam/apple.com>
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Viewed:
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1473 times
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Hi all,
I'm having fun with my HB! For a software guy like me a 8 bit processor at 2 Mhz with 32K of RAM is a little small but it's so easy to add sensors to it it's just plain fun! But I'm an hardware newbie and I need more info on the sensors I can add to my little board.
I build my first robot a couple of days ago on a really simple wood+tape base: it was pretty stupid, running straight (or trying to run straight, I guess I need some shaft encoder to make it real straight) and backing up and turning when bumping into a wall. Primitive. And it felt completely apart on the third wall. I guess I need a better base to build on;^)
Now I have some work to do. I need to understand what kind of information all these sensors are going to return and what I can do from it. For example I played with a photocell plugged in the HB and I'm trying to see what I can do with it. It can detect a color change when it's close to a surface (I guess I can build a line follower from that), it can also detect a light source in a distance if you encase the photocell in a tube to narrow its angle. Is there any other uses?
I also got a reflective infrared sensor (I bought my HB from Gleason Research, and I got the sensor/motor kit they are offering with it) and I don't really know what to do with it! It seems to give me a reading relative to the sensor distance from a surface, but not always... And sometime I got "close" reading when I'm actually really far from any surface... Can somebody explain to me the logic behind this? There is so many infrared stuff in these electronics catalogs, and nowhere an explanation on the differences between them! What's the difference between my reflective infrared sensor and the one used by Rug Warrior to do shaft encoding? I tried to test mine on top of a piece of paper with black and white stripes and I cannot get a different reading on the black that I can get from the white... I'm confused ;^)
What kind of sensors are you using on your bots? And more importantly for what purpose did you select this sensor?
-- Eric
PS: Thanks to all of you for your recommendations on a LEGO set to use. I'm waiting for the LEGO and LEGO-DACTA catalogs to show up in my mailbox and I'll let you know what I do end-up buying.
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Message has 2 Replies:
 | | Re: Questions about sensors
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| (...) One thing that was discussed before (I think on this mailing list?) that I thought was pretty cool was a small robot with a microphone (FM wireless mike perhaps?) and a photocell. It would stay in the shadows while trying to get close to (...) (26 years ago, 20-Oct-98, to lugnet.robotics.handyboard)
| | | Re: Questions about sensors
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| Eric Noyau wrote: <snip> (...) The results you get from a reflective IR sensor will vary quite a lot depending on surface color, roughness, angle of incidence, electrical noise, etc. My IR sensors were not good for much of anything besides encoders, (...) (26 years ago, 21-Oct-98, to lugnet.robotics.handyboard)
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Message is in Reply To:
| | serial board
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| I'm having trouble assembling the serial board. When I do the test(see snip below) I only get about 5 volts. When I try and run the downloader, I don't see the green light come on. (tried two different computers....) any suggestions? thanks in (...) (26 years ago, 16-Oct-98, to lugnet.robotics.handyboard)
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