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I was browsing Lego's official Mindstorms site, after not having looked for a while, and came across (URL) claims to be an all-lego digital camera. I know this concept has been mentioned on here, but I hadn't heard of anyone actually doing it. I'm (...) (25 years ago, 16-Jul-99, to lugnet.robotics)
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| | Re: digital camera entirely made of mindstorms?
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(...) A blocky image that had been smoothed or blurred would result in an image similar to what they show. Based on what they show I don't doubt that the camera there does actually work. I bet that it is really slow though. alex -- Did you check the (...) (25 years ago, 17-Jul-99, to lugnet.robotics)
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| | Re: digital camera entirely made of mindstorms?
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(...) Do you think you could really focus on an individual pixel so easily? (25 years ago, 17-Jul-99, to lugnet.robotics)
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| | Re: digital camera entirely made of mindstorms?
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(...) Well, you'd have to ask him to be sure ( mailto:amnon@best.com ). But, I think the reason the image isn't blocky is because the robot scans at high resolution. By that I mean, he made the robot scan several hundred "scanlines" with several (...) (25 years ago, 19-Jul-99, to lugnet.robotics)
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| | Re: digital camera entirely made of mindstorms?
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(...) Ooh, I didn't see that. Thanks. (...) Hmmm. I guess in that case my second scepticalness is over the ability to aim position the lens that precisely with lego gears... (25 years ago, 21-Jul-99, to lugnet.robotics)
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| | Re: digital camera entirely made of mindstorms?
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(...) The error you refer to can be eliminated by using a rotation sensor on the axle of greatest angular velocity, and (more important) by scanning in the same direction each time. - Robert Munafo (25 years ago, 21-Jul-99, to lugnet.robotics)
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| | Re: digital camera entirely made of mindstorms?
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This thread is pretty old, but if any of you have questions about how I made my pure-lego digital camera, I would be happy to answer them. The camera scanned the sensor by tilting the sensor. It used the magnifying glass from the Adventurer's set. (...) (24 years ago, 26-Sep-00, to lugnet.robotics)
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| | Re: digital camera entirely made of mindstorms?
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(...) (This may be marginally off-topic - but someone will find it useful) That reminds me of the digital camera I made 'by hand' about 15 years ago by *carefully* milling the 'lid' off an old DRAM chip and replacing it with a microscope slide (...) (24 years ago, 27-Sep-00, to lugnet.robotics)
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| | Re: digital camera entirely made of mindstorms?
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Oh! I remember a story about that in one of the Apple ][ magazines, or Circuit Cellar or something. They took a picture of a lightbulb I think (I guess their version needed more light than yours). They used the same technique you describe. I thought (...) (24 years ago, 27-Sep-00, to lugnet.robotics)
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| | Color images? (was: Re: digital camera entirely made of mindstorms?)
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Ok, maybe I'm just out in left field on this one, or maybe someone will actually be inspired to try it out... How about making a color digital camera? Proposal: modify the existing design for the camera by adding on a colored filter, and an extra (...) (24 years ago, 27-Sep-00, to lugnet.robotics)
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| | Re: Color images? (was: Re: digital camera entirely made of mindstorms?)
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(...) Ok, so it's uncouth to reply to my own messages, but more on the color blending: -each filter could be 2 1x2 trans bricks-- the red filter would be green & blue, green would be red & blue, blue would be red & green -you'd also have a 4th (...) (24 years ago, 27-Sep-00, to lugnet.robotics)
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| | Re: Color images? (was: Re: digital camera entirely made of mindstorms?)
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In theory, yes I believe it could be done, however I would be concerned that a 1x2 filter would be so thick as to distort the image drastically... better to take a sheet of transparency material and print a red, green and blue spot and attach it (...) (24 years ago, 27-Sep-00, to lugnet.robotics)
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| | Re: Color images? (was: Re: digital camera entirely made of mindstorms?)
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First you would need to find a light sensor that detects visible light, not mostly infared light. What type of sensor is this? Andy (...) (24 years ago, 28-Sep-00, to lugnet.robotics)
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| | Re: Color images? (was: Re: digital camera entirely made of mindstorms?)
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I tried this a little when I first made my robot using the red bat wings that come with the set, and I couldn't get a good image through one of them. One of the big problems is that the sensor is mostly infrared, with some red sensitivity. I haven't (...) (24 years ago, 28-Sep-00, to lugnet.robotics)
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| | Re: Color images? (was: Re: digital camera entirely made of mindstorms?)
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(...) Actually, I went home and tried it, and this seems to be the major problem. Even for objects that were totally green or blue, the value with the red filter over the end of the sensor was consistantly higher than the blue or green filtered (...) (24 years ago, 28-Sep-00, to lugnet.robotics)
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| | Re: digital camera entirely made of mindstorms?
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I have more detailed photos of the assembly if you would like to reproduce my results: (URL) is essentially two turntables fastened together with angle brackets. It uses a touch sensor to home the yaw, and a rotation sensor to control the pitch. (...) (24 years ago, 28-Sep-00, to lugnet.robotics)
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