 | | RE: motor voltages
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The most efficient way to do this is to use a "step down" regulator. These small switching regulators can efficiently lower the voltage while maintaining the current requirements. Maxim sell several chips that do this however you will be limited to (...) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Assembler
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(...) I thought I would add for all who haven't read the IC manual, (like me a few weeks back), that it clarifies alot of the capabilities and workings of the handyboard. And that it only takes like one night of bedtime reading so it's kinda short (...) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | Re: motor voltages
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I think what you need is only a simple VR( voltage regulator) It kinda resembles a transitor in appearance). I'm curious to know whether this is all you need. I'm not an EE either so I wonder if you need heat sinks or capacitors or something. ? (...) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Ultrasound Range-Finding
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I looked arround and this is the cheapestI've found so far. If you go to the various ultrasound specialists, they want an arm and a leg...make that your a torso too. I believe these polaroid things are manufactured in LARGE production conpared to (...) (28 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. (...) (28 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 (28 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 (...) (28 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. (...) (28 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 (...) (28 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) (28 years ago, 15-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) (28 years ago, 15-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 ***...*** (28 years ago, 14-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 (...) (28 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 (...) (28 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 ***...*** (28 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 (...) (28 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 (...) (28 years ago, 13-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 (28 years ago, 13-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 (...) (28 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 (...) (28 years ago, 12-Apr-96, to lugnet.robotics.handyboard)
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