 | | Re: High current motors
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Do you have to choose a transistor that will switch somewhere near and below 9 volts? Cause Fred mentioned that the handyboard is rated for 9V motors. But, does this mean that the pulse generator make 9V square waves? (...) (29 years ago, 4-Apr-96, to lugnet.robotics.handyboard)
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| | Re: High current motors
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How about this one? ...to enable two directional rotation. ___...___ motor ___...___ | | | | -> / / -> |/ |/ |/ |/ ---| ---| ---| ---| | |\ | |\ | |\ | |\ | \ | -> | -> | \ | | | | | | | | | | | | | | | | | vcc | gnd | gnd | vcc | | | | | | | | | | (...) (29 years ago, 4-Apr-96, to lugnet.robotics.handyboard)
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| | Re: High current motors
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I think the question on how to run higher current motors has got to be the most asked question here. Maybe we should add more info to the FAQ or something. Anyway, here is Chuck McManis' solution from a while back. I hate to send out something that (...) (29 years ago, 5-Apr-96, to lugnet.robotics.handyboard)
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| | Expansion board
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How many Polaroid range sensors can the expansion board have up to. One? What kind of signal does it produce? (29 years ago, 5-Apr-96, to lugnet.robotics.handyboard)
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| | mseconds
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Is there a way to get sub-milisecond times measured with the handyboard? I was thinking of trying to modify msecond but I can't look at it now that it is a primitive. Dirk (29 years ago, 7-Apr-96, to lugnet.robotics.handyboard)
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| | http://lcs.www.media.mit.edu/groups/el/projects/handy-board/maillist.htm
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i would like to use the list. thankyou, Jeff (29 years ago, 7-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Handyboard expansion status
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(...) I don't have one of the beta versions of the expansion board, but I've been building my own expansion boards and putting them on the HB. One thing that I've found is problematic with the HB design, in regards to expansion board design, is that (...) (29 years ago, 7-Apr-96, to lugnet.robotics.handyboard)
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| | Pcode instructions?
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OK. I know this is going to be a long shot, but here goes: Are there any docs on the pcode? I.e. is there some way that I can learn what I need to learn to modify the source code pcode.asm besides reading the file pcode.asm and tearing my hair out? (...) (29 years ago, 8-Apr-96, to lugnet.robotics.handyboard)
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| | more address lines on expansion board
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Hi Brian, When Fred and I designed the Rev 2.0 6.270 controller, we consciously made the expansion bus small and simple. For most expansion devices, the pre-decoded chip selects make more sense than sending all the address lines, since the latter (...) (29 years ago, 8-Apr-96, to lugnet.robotics.handyboard)
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| | HB design
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I got my handyboard on Saturday, and followed the assembly instructions that Fred did, and was thoughoughly impressed. Fred, you did great work, and have really done a great service to all of us. Thanks. (29 years ago, 8-Apr-96, to lugnet.robotics.handyboard)
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| | Sonar
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I don't have my Handy Board yet, but I do need some help in locating a Sonar Ranging Module. I have looked everywhere I can think of to no avail. Even emailed Polaroid and asked them. Twice. Still have no response from them. Where do I get a (...) (29 years ago, 8-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Sonar
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(617)386-3965 OEM Components Group 3 kits: $299, $165, $99 You're probably interested in th $99 one wich has 2 Rangers and 2 Transducers. (...) (29 years ago, 8-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Sonar
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Speaking of Polaroid ultrasonic sensors, does anyone know if there's a product out there that can multiplex a few of the sensors? Thanks. (29 years ago, 9-Apr-96, to lugnet.robotics.handyboard)
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| | RE: Sonar
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The Robotics Practitioner (trp@footfalls.com has part 1 of an article about this in the Fall, 1995 edition by Bavid Musliner (musliner@src.honeywell.com) and Rick Moll (rick@footfalls.com). Part one is concepts; part 2 will present detailed design. (...) (29 years ago, 9-Apr-96, to lugnet.robotics.handyboard)
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| | Emitting 40khz IR
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How do I send out 40khz IR on the handyboard IR port so that I can use a Sharp IR detector for proximity sensing? I would need a signal that wasn't modulated at 100 or 125 hz, right? Just a straight 40khz signal. Any help would be appreciated. -John (29 years ago, 9-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Sonar
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Yeah! This would help alot! Who is trp@footfalls.com? Is this person someone who posted the article once in handyboard mailing list? (...) (29 years ago, 9-Apr-96, to lugnet.robotics.handyboard)
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| | RE: Sonar
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The Robotics Practitioner is a magazine about robotics targeted more for students and hobbyists than many of the professional Journals. Their email address is: trp@footfalls.com. Other two email addresses in the previous messge are the articlel's (...) (29 years ago, 9-Apr-96, to lugnet.robotics.handyboard)
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| | Polaroid Sonar Bulk Buy
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Hello Everyone, As you may or may not know I am hosting a Bulk Buy for the Polaroid 6500 Sonar Ranging Modules and matching Transducers. The deadline for orders to be in by regular mail is coming up quick, Friday, April 19, 1996. If you are (...) (29 years ago, 9-Apr-96, to lugnet.robotics.handyboard)
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| | fuse on handyboard
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I'm curious - what is the maximum current the Polyswitch fuse on the handyboard will allow to pass through it? I'm designing an H-bridge circuit to allow me to drive a heftier base with the handyboard, and I'm trying to figure out if I can still (...) (29 years ago, 10-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Emitting 40khz IR
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poke(0x1000,0x40); will turn the IR on at 40KHZ and poke(0x1000,0x0); will turn it off. (...) Dr. M. K. Ramasubramanian Assistant Professor Department of Mechanical and Aerospace Engineering North Carolina State University Box 7910 Raleigh, NC (...) (29 years ago, 10-Apr-96, to lugnet.robotics.handyboard)
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