 | | re:4 line LCDs and other LCD questions
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(...) HB experts, correct me if I'm wrong, but if someone wanted to use an LCD bigger than 2x16, wouldn't the pcode have to be recompiled? I know that in the pcode.asm file there is reference to displays up to 2x80 (of which I have 4 and none work (...) (29 years ago, 12-Apr-96, to lugnet.robotics.handyboard)
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| | Servo
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Does anyone know how to activate the servo on HandyBoard with IC? (I am going to use the Polaroid Sonar Ranger when it gets here.) When I try to load 'Servo.C', the supplied program, I get 6 or 8 errors of unassigned lables. I assume that (...) (29 years ago, 12-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Servo
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(...) You need to do a 'load servo.icb' before you do the 'load servo.c' command. The .icb file contains the code described in the servo.asm file, in a binary format. The code in the servo.asm file does the actual work of running the servo output. (...) (29 years ago, 12-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Servo
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you have to load both servo.c and servo.icb. -Fred -- This message was composed using Articulate Systems' PowerSecretary, a Macintosh-based speech-to-text dictation system. Please forgive any sloppiness in the formatting. Thanks. -Fred In your (...) (29 years ago, 12-Apr-96, to lugnet.robotics.handyboard)
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| | h-bridges, current info
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I'm trying to figure out a couple things. First, can four NPN transistors be used to form an h-bridge? I was looking in a book, the Robot Builder's Bonanza, which features a circuit which uses four TIP41 transistors. However, don't most h-bridges (...) (29 years ago, 12-Apr-96, to lugnet.robotics.handyboard)
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| | Ultrasound Range-Finding
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I would like to add range-finding of some description to my robot project. I would prefer to make it as cheap as possible. I have heard of the various polaroid-based schemes, but these all sound as though they are $90+ solutions. Does it have to be (...) (29 years ago, 12-Apr-96, to lugnet.robotics.handyboard)
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| | Re: h-bridges, current info
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(...) the fuse is rated for about 2.5A continuous. If that is not enough, get one rated for more current, or replace it with a wire and make sure not to short out the nicads, or you'll get 30 to 40 A flowing. -F (29 years ago, 13-Apr-96, to lugnet.robotics.handyboard)
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| | Battery level monitoring?
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Has anyone figured out how to monitor the battery level on an HB1.2? I would like to be able to use a circuit similar to the one published in the Jones Mobile Robots book, but it connects output directly to an analog port and is confused by the (...) (29 years ago, 13-Apr-96, to lugnet.robotics.handyboard)
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| | Motor Voltage Hack
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Want to use motors of different voltage than the 9V required by HandyBoard? Then read this. I had decided to use converted Servo's as wheel drives, and they want about 4.8V. In studing the diagram and board layout I discovered that the HB batterys (...) (29 years ago, 13-Apr-96, to lugnet.robotics.handyboard)
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| | Extention Board?
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I heard that there is an extention board for the HandyBoard. Does anyone know if it is available yet, and where I can get one? Price also? Thanks Larry ***...*** Larry Randall ***...*** If it works Don't fix it! ***...*** lrand@cts.com ***...*** (29 years ago, 13-Apr-96, to lugnet.robotics.handyboard)
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| | 6V motors off of 9.6V (again)
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Yes, once again, I'm exploring the idea of running some 6V motors off of the handy board's 9.6V battery. Basically, I'm worried that if I do this, I'm going to burn out _another_ pair of motors. (Though the last couple were 3V, these are 6...) How (...) (29 years ago, 13-Apr-96, to lugnet.robotics.handyboard)
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| | motor voltages
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Along similar lines, anyone know of a nice way to regulate 9.6V down to 6 or so, at 2 or 3 amps peak? I'm looking for something that's efficient, and won't try to burn itself out during normal use. Possibly something like the LM317 is available in (...) (29 years ago, 13-Apr-96, to lugnet.robotics.handyboard)
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| | Assembler
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How do I turn a *.asm into a *.icb? I believe I need a program as11.???. Anyone know where it is? Larry ***...*** Larry Randall ***...*** If it works Don't fix it! ***...*** lrand@cts.com ***...*** (29 years ago, 14-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Assembler
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(...) If you are using the Beta of Interactive C, you can use the web version of the assembler found at: (URL) R. Cunningham MSI Consulting Group (URL) (29 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Motor Voltage Hack
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(...) [snip] (...) Thanks for this great tip - Can we also tie this second battery pack into the nicad charging system somehow? Sean R. Cunningham MSI Consulting Group (URL) (29 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | Smoothing capacitors on motors?
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I am using a couple of 6V motors and I have read that it is a good idea to put a capacitor across the terminals of each motor. Although I see references to this practice all over, no one has indicated what ratings this capacitor should have. Does (...) (29 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Assembler
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(...) 1. please read the IC manual, which is now localized for the Handy Board. this explains how the ICB system works in detail. look on the HB home page to find the IC manual. 2. yes, you need as11_ic. mac and unix versions are readily available. (...) (29 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Assembler
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(...) I'm pretty sure that files assembled this way will work with the freeware IC as well. Please note one big GOTCHA with ICB files. On the MS-DOS platform, the ICB files must have Unix-style line termination. OK, what does that mean. In a text (...) (29 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Smoothing capacitors on motors?
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(...) 0.1 uF Use ceramic disk capacitors because they can withstand the high voltage of the spikes. -f (29 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Motor Voltage Hack
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(...) Yes, I believe so. I was thinking of that last night but haven't had a chance to look it over. I think you would need to temporarally reconnect the cut with some form of voltage drop,(several diodes in series ?) when the charger is connected. (...) (29 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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