 | | Re: Motors & handyboard
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(...) EE Question: How do you use a multimeter to measure the current? I was told that you need a current probe to do this kind of thing. ?? (28 years ago, 14-Feb-97, to lugnet.robotics.handyboard)
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| | Re: Automatic feeding.
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(...) Here's an idea for you: For a mechanical system you could use two 'wiskers': one on top and one on the bottom of the 'bot. (Or one each side.) You set up the 'feeding pen' to be two parallel metal plates. Set them up so that the 'bot can roll (...) (28 years ago, 14-Feb-97, to lugnet.robotics.handyboard)
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| | Re: Motors & handyboard
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(...) Unfortunately this is the LEAST amount of current the motor will draw when operating. You have measured the 'unloaded current'. Now, while you have your motor running, grab the shaft between your fingers and stop it, and measure that current. (...) (28 years ago, 14-Feb-97, to lugnet.robotics.handyboard)
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| | LMD18200 Motor driver
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Is there a way to use the LMD18200 motor driver as a replacement for the motor chip on the handyboard? I know that they are not pin compatable but is there some type of interface that can be built easily? Thanks. Keith Keith Soldavin (...) (28 years ago, 14-Feb-97, to lugnet.robotics.handyboard)
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| | Automatic feeding.
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Has anyone worked up a system where a Hanyboard bot monitors it's battery level and then when it starts to get low it rolls over to a charging device and "plugs itself in"? It seems like this should be doable but I don't think I've seen any (...) (28 years ago, 14-Feb-97, to lugnet.robotics.handyboard)
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| | Re: expansion board
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I used the one available IR LED driver on the HB to drive a Radio Shack high-output IR LED. This, along with a Radio Shack IR decoder module (a little silver box about the size of a sugar cube that takes +5vdc and ground, and outputs a TTL level (...) (28 years ago, 14-Feb-97, to lugnet.robotics.handyboard)
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| | Re: Motors & handyboard
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(...) how did you take this measurement exactly? I think 75 mA might be kind of low, most motors will draw this much when they are just spinning but doing no useful work, but then draw much more when they are driving a geartrain. (...) actually, (...) (28 years ago, 14-Feb-97, to lugnet.robotics.handyboard)
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| | Motors & handyboard
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Yesterday I tried to run a motor out of the HB. First I tried how much current it needed with a multimeter and a 5V power source ... The result 75mA. When I tried to run the motor from the HB, after turning on the motor at low speed (motor (0,20);) (...) (28 years ago, 14-Feb-97, to lugnet.robotics.handyboard)
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| | Re: expansion board
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(...) I've got a PIC chip programmed with IR collision-detection built into it (I'm trying to get some of the new 8 pin PICs to see if I can make an "all in one" unit. Basically the interface is two bits: bit 0 output - Turn on IR illumination (...) (28 years ago, 14-Feb-97, to lugnet.robotics.handyboard)
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| | expansion board
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Fred, It seems to me that the first thing most people want to add to their robots that is not supported on the handyboard itself, is IR collission detection. How about including a modulator and driver for IR LED's, and a detector and demodulator (...) (28 years ago, 14-Feb-97, to lugnet.robotics.handyboard)
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| | Sockets for 18200
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Does anyone know if there exists a socket for the National 18200. My application warrants the need to be able to replace the chips if they should ever fail. thanks for any information Patrick (28 years ago, 14-Feb-97, to lugnet.robotics.handyboard)
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| | Re: Port E inputs
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the 6.270 has a diff anlg ckt. remember, the app b is generally applicable, but some details are different. -f In your message you said: (...) (28 years ago, 14-Feb-97, to lugnet.robotics.handyboard)
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| | dual servos
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Hello everyone, I have been fiddling with my dual servo routines and I have gotten things running to the point that I now need a chassis for my project. While working on the drive system I have noticed that when under heavy motor load (2 motors at (...) (28 years ago, 14-Feb-97, to lugnet.robotics.handyboard)
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| | Port E inputs
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Hello, I noticed that in Figure B.9 on page 194 in Appendix B of the 6.270 manual that pins PE0-PE3 are shown to go to seperate little port symbols while pins PE4-PE7 go to a block labeled 'Analog Input Header'. Do these inputs really go to two (...) (28 years ago, 13-Feb-97, to lugnet.robotics.handyboard)
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| | (Kein Bezug)
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help (28 years ago, 13-Feb-97, to lugnet.robotics.handyboard)
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| | LM324
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The latest expansion board schematic shows an LM324 for the high impedance input buffers. Although the LM324 is cheap and available, its input and output voltage ranges are limited to 0 to 3.5V (yes, probably a little more with any real part). If (...) (28 years ago, 13-Feb-97, to lugnet.robotics.handyboard)
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| | UNSUBSCRIBE from handyboard@media.mit.edu
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Hello, who can tell me how I UNSUBSCRIBE me from this Mailing List... Thanks Bye, Matthias Pletz (28 years ago, 13-Feb-97, to lugnet.robotics.handyboard)
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| | Re[2]: as11_ic
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Hello, Am I the only one who is still lost with this stuff? Help! I see the Mac ports of the as11 assembler on the web site; why can't the DOS version be put there? I have been unable to find the assembler on Motorola's web site despite several (...) (28 years ago, 13-Feb-97, to lugnet.robotics.handyboard)
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| | is there a program
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I am building a handyboard from the board up and i was wondering if a program exists that when the handyboard is programmed i can get it to run through a maze on my monitor, i can't afford a body right now thanks ted houle (28 years ago, 12-Feb-97, to lugnet.robotics.handyboard)
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| | Re: as11_ic
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There are two fundamentally different ways to go about writing assembly language programs for the Handy Board: 1. Write them as callable functions for the Interactive C environment, using the as11_ic program. 2. Scrap Interactive C entirely, and (...) (28 years ago, 12-Feb-97, to lugnet.robotics.handyboard)
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