Building : 10848


Building / 10848

Magnetic Levitator —Christopher Snead
Hello, everyone! I've finally finished a project for my Physics class: (URL) device suspends small, ferromagnetic objects in midair using an electromagnet and a beam of light. The beam of light shines on a phototransistor, which translates via a (...) (23 years ago, 6-Dec-01, to lugnet.build, lugnet.general)

	Re: Magnetic Levitator —Kevin Loch
	This is awesome. What are you using for the control circuit? Any chance you could use an RCX? KL (...) (23 years ago, 6-Dec-01, to lugnet.build, lugnet.general)

		Re: Magnetic Levitator —Christopher Snead
		(...) I think that it would be possible to use an RCX. I used four op amps in my circuit; the first amplifies the signal coming from the phototransistor, the second differentiates the signal, the third takes the difference of the proportional and (...) (23 years ago, 7-Dec-01, to lugnet.build, lugnet.general, lugnet.robotics)

			RE: Magnetic Levitator —B. Shahian
			We tried using the Handyboard (which is faster than RCX) and it could not do it. I think the RCX is not fast enough for UNSATBLE control systems such as magnetic levitation, etc. A while back, I proposed the inverted pendulum problem as a challenge, (...) (23 years ago, 7-Dec-01, to lugnet.robotics)

	Re: Magnetic Levitator —Mladen Pejic
	Amazing work Chris! Seeing metallic objects suspended in air never gets dull. ;-) I also really like how you integrated all the electronic into the LEGO frame. Impressive, most impressive... (...) (23 years ago, 6-Dec-01, to lugnet.build, lugnet.general)

	Re: Magnetic Levitator —Gary E. Blessing
	whoa, that so cool! Gary Christopher Snead <Legosapiens@hotmail.com> wrote in message news:Gnxw4z.L2n@lugnet.com... (...) the (...) light (...) the (...) the (...) magnetic (...) the (...) Using (...) also (...) electromagnets (...) pure (...) (23 years ago, 7-Dec-01, to lugnet.build, lugnet.general)

	Re: Magnetic Levitator —Dave Johann
	(...) Excellent job Chris! I love what I see! When can we expect to see you destroy most of Tokyo with this device? :) (...) Excuse me? I don't need to be built and you know this...sheesh! Maybe I'll just go off and build me a Lego Sapiens or (...) (23 years ago, 7-Dec-01, to lugnet.build, lugnet.general)

	Re: Magnetic Levitator —Eric Sophie
	Chris, I remember when we were at the Lugola meeting and you said you were gonna make this device and incorporate Lego into it, and now walllllllaaaaa! More below.... (...) Elegant! (...) Right on! (...) hee hee Hey that's interesting 'cause I'm (...) (23 years ago, 7-Dec-01, to lugnet.build, lugnet.general)

		Re: Magnetic Levitator —Gary E. Blessing
		Eric Sophie <Legomaster@gobi.com> wrote in message news:Gnyyvs.F1u@lugnet.com... <snip> (...) earth (...) over (...) develope (...) actualy wouldn't you need 6? Gary (23 years ago, 8-Dec-01, to lugnet.build, lugnet.general)

			Re: Magnetic Levitator —Fred M. Sloniker
			(...) Four would be sufficient, but they'd have to be arranged in a tetrahedral formation, which I don't think can be readily done for geosynchronous satellites. There are more fundamental flaws with the idea, though. (You'd want some sort of (...) (23 years ago, 12-Dec-01, to lugnet.build, lugnet.general)

	Re: Magnetic Levitator —Mark-Jan Bastian
	(...) Very cool! I was wondering, if you photographed the object using a flash, wouldn't the object drop a fraction of a second after that ? Also, I understand that the light shines from the right side, and enters a photodiode on the left side (or (...) (23 years ago, 8-Dec-01, to lugnet.build, lugnet.general)

		Re: Magnetic Levitator —Christopher Snead
		(...) The Phototransistor and diode are recessed deep inside the technic bricks, which make very effective lightshields. (...) The object is in the middle, but off of the axis formed by the phototransistor and the diode. the object only partially (...) (23 years ago, 8-Dec-01, to lugnet.robotics)