 | | Re: Increasing current output to motors on HandyBoard
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So that's like $28 for the H excluding the protecting circuitry? How much did this setup cost for both motors? ---...--- ericson mar Robotics Consultant mar@cooper.edu (212)353-4356 Department of Mechanical Engineering The Cooper Union for the (...) (26 years ago, 10-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Increasing current output to motors on HandyBoard
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Howdy, My original suggestion was to use *solid state* relays. They don't have any contacts. I use them plugged right into my Rug Warrior board at the motor output ports (would work the same on my Handy Board, but I have it on a smaller base, and (...) (26 years ago, 10-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Increasing current output to motors on HandyBoard
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Haven't actually tried it, but I was thinking of the same sort of thing. Use a FET for PWM and a DPDT relay for direction. practically speaking, if you only switched the relay when the FET was off, no power transition, etc.... If your 'bot moves (...) (26 years ago, 10-Apr-99, to lugnet.robotics.handyboard)
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| | GCC/HC11 small patch
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I contacted the original person who did the HC11 port to gcc (Otto Lind), and he pointed me to a patch for it. If you're using gcc-2.8.1 with the HC11 patches in it, you may want to try this: At line 502 of config/m6811/m6811.c, change from: { (...) (26 years ago, 9-Apr-99, to lugnet.robotics.handyboard)
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| | Re: GCC 2.8.1 for HC11
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(...) You can have a copy of mine if you like. You can relocate it to any available digital ports with ease. It is set up for a single sensor, but you can easily add as many as you have ports for. (...) For people using the Handy Board in small (...) (26 years ago, 9-Apr-99, to lugnet.robotics.handyboard)
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| | Re: GCC 2.8.1 for HC11
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(...) I think I'm in the process of writing up such a document. Combined with Fred's guide to programming the 6811 (which covers the miniboard nicely), hopefully this will fill the gap. (...) And using IC libraries works well, up until you have a (...) (26 years ago, 9-Apr-99, to lugnet.robotics.handyboard)
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| | Re: GCC 2.8.1 for HC11
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(...) You have to get good at reading schematics in this case, period. Schematics are very hard to read at first, but it does get easier quickly. If someone were to write up details on how to access various devices on the Handyboard though (...) (26 years ago, 9-Apr-99, to lugnet.robotics.handyboard)
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| | Vesit rover
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Dear friends, You know that we at Vesit, Bombay were making a rover using the handy board. Learn more about it at (URL) sincerely, Nitin (26 years ago, 9-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Multi-Processing
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Dear Kat, Try using music.c that I had downloaded and I have sent as an attachment.This file cantains functions which play music on the piezobeeper. Yours sincerely, Nitin (...) (26 years ago, 9-Apr-99, to lugnet.robotics.handyboard)
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| | Re: PCB coating
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First use TINNIT Bright Tin Plate No. ER18 (cheap and does the job) available at Circuit Specialists and Jameco. A better tin plate already mixed can be found at JDR Micro Devices. Then use M.G. Chemicals Conformal Coating which is a flexible (...) (26 years ago, 9-Apr-99, to lugnet.robotics.handyboard)
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| | Re: interactive C
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Dear Stefano, Visit el.www.media.mit.edu...index.html to find about the needed software. Mostly you will be needing ic.exe and some library files. You may need a new pcode. Yours sincerely, Nitin (26 years ago, 9-Apr-99, to lugnet.robotics.handyboard)
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| | power supply questions
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Hello all, I want to power the handy board using the 250watt 12V 9amp power supply of a PC. Any suggestions as to what I should take into consideration before attempting this. A buffer? A fuse? A straight hook up? Why is the HB not supposed to be (...) (26 years ago, 9-Apr-99, to lugnet.robotics.handyboard)
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| | Re: GCC 2.8.1 for HC11
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(...) My favorite 68HC11 text resource is: 68HC11 Microcontroller by Joseph D. Greenfield Amazon Price: $87.50 (Wow! I'm sure I didn't spend nearly this much when I bought mine 3 years ago...) The sections on using the 68HC11 timers for interrupts, (...) (26 years ago, 9-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Increasing current output to motors on HandyBoard
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I wonder if this would last since a relay is mechanical and I would assume that it would wear with all that "switching". Doe anyone have any experience with this? Thanks. ---...--- ericson mar Robotics Consultant mar@cooper.edu (212)353-4356 (...) (26 years ago, 9-Apr-99, to lugnet.robotics.handyboard)
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| | Re : -> Interactive C
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You help has been really useful, i'm going to visit thi slink immediately! Stefano Falconetti (26 years ago, 9-Apr-99, to lugnet.robotics.handyboard)
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| | Re: interactive C
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I'll follow your suggest, thanks for the time you gave me. It has been very useful! Stefano ---...--- (...) (26 years ago, 9-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Increasing current output to motors on HandyBoard
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Another solution to this which is easier but more expensive is to use the output of the motor driver chip to drive solid state relays. You need the relays that use 5 volts for control and that will switch DC. The relays I use have flyback diodes in (...) (26 years ago, 9-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Increasing current output to motors on HandyBoard
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(...) Stacking the chips is doable but you will toast them when you get near their current limit. An easier solution is to use the TI chips to drive power transistors that are acting as voltage followers. This lets them take the current. (...) (26 years ago, 9-Apr-99, to lugnet.robotics.handyboard)
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| | Increasing current output to motors on HandyBoard
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I am looking to drive a radioshack motor off my HB. Its rated at 9V - 18V. It claims that at maximum efficiency it will draw 1.98 Amps. My HB uses the TI sn754410ne motor controller and is rated only up to 1 amp. If i replace this unit with a L293b (...) (26 years ago, 9-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Sensor Question
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(...) I use both and infrared ranging sensor and sonar. I have them both mounted on rotating bases. If you plan to do some serious work with your application, then you might find this approach a little difficult. The reason is that if your robot is (...) (26 years ago, 9-Apr-99, to lugnet.robotics.handyboard)
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| | Sensor Question
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Hi, Just a quick question...What would be most effective ? An array of sensors (IR or sonar), or a single sensor on a continuously rotating base (assume 1 rotation every 2 secs...) ? Could someone here explain me the main functional differences of (...) (26 years ago, 9-Apr-99, to lugnet.robotics.handyboard)
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| | Re: GCC 2.8.1 for HC11
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The problem I have isn't programming the HC11. I picked that up with no problem by spending a day reading Motorola's reference manual (AKA the pink book - kindly provide free by Motorola via their web page). I've got a software background, and while (...) (26 years ago, 8-Apr-99, to lugnet.robotics.handyboard)
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| | Re: GCC 2.8.1 for HC11
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(...) I've been through Charles Hacker's Buffalo monitor code, the Miniboard GCC & ICC libraries, the Handyboard ICC libraries, and a few other sources, and looked at the schematics and data books a lot. That's the best way to get intimately (...) (26 years ago, 8-Apr-99, to lugnet.robotics.handyboard)
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| | Re: GCC 2.8.1 for HC11
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Keith, I have a reference for you. It is "Microcomputer Engineering," 2nd ed. by Gene H. Miller. You can get it from one of the online book sellers, like amazon.com. It is around $85 or so. In this text is the whole range of things having to do with (...) (26 years ago, 8-Apr-99, to lugnet.robotics.handyboard)
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| | Multi-Processing
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Hello all- I am using my Handy Board on a robot. My team and and I thought it would be really cool if we could get it to play music while it is moving. Is there a way to do this? In my testing it seems that it only does one or the other. If anyone (...) (26 years ago, 8-Apr-99, to lugnet.robotics.handyboard)
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| | Re: GCC 2.8.1 for HC11
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I've taken a look at Chuck's LCD code, and I agree that it's the best I've come across. I spent last weekend studying how to program the HB in assembly. There is a woeful lack of documentation for it. There is plenty of docs on programming in IC, (...) (26 years ago, 8-Apr-99, to lugnet.robotics.handyboard)
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| | Re: GCC 2.8.1 for HC11
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(...) I took the assembly routine out of the ICC11 library and adapted it slightly for GCC (input/output params mostly). I had to split up the assembly and C-code portions into separate files, and have the lcd.h/lcd.c/lcdasm.s files ported and (...) (26 years ago, 8-Apr-99, to lugnet.robotics.handyboard)
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| | Re: GCC 2.8.1 for HC11
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(...) ... (...) Curt, may I suggest that rather than re-invent the wheel you take the LCD code out of the Handyboard libraries I wrote that are on the icc11 site. They should pretty much compile out of the box and I know they work :-) They are also (...) (26 years ago, 8-Apr-99, to lugnet.robotics.handyboard)
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| | interactive C
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Hi, I'm new to 6811 and I've a board that is different from the handyboard. I'd like anyway to try interactive C. Who can explain me how many interesting things I can do with 32Kb of interactiove C code ? What I need ? And where can I find all the (...) (26 years ago, 8-Apr-99, to lugnet.robotics.handyboard)
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| | Re: GCC 2.8.1 for HC11
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The GCC Miniboard library -plus- LCD routines are almost completely ported to the Handyboard. The LCD routines started playing nicely early this morning but I haven't added the low-level stuff into the timer interrupt yet. I can now write characters (...) (26 years ago, 8-Apr-99, to lugnet.robotics.handyboard)
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| | Re: PCB coating
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(...) Hi Clancy, there are tinning compounds (for use prior to soldering) but I've always just sprayed it with clear lacquer (after soldering). Keeps the copper from oxidizing... Cheers, Duncan (26 years ago, 8-Apr-99, to lugnet.robotics.handyboard)
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| | PCB coating
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I have been making my own PCBs and would like to coat the copper side with something to keep the copper in good shape, does anyone have any suggestions?. Thanks, Clancy (26 years ago, 8-Apr-99, to lugnet.robotics.handyboard)
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| | array of sharp IR range sensors
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khi, i;d like to pass the following idea around here to see what you guys think. the idea is to use the same clock for an array of several (say 6) of the sharp sensors. the idea is to wait until all of them are responded that are ready to go and (...) (26 years ago, 8-Apr-99, to lugnet.robotics.handyboard)
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| | Re: PCB coating
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(...) I would think a coat of lacquer would do pretty good. It could be colored or clear. If you are making multiple boards you could probably even use a small screen print system to apply it. Mike (26 years ago, 8-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Use of sony-ir functions in program
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(...) There is some sample code for using irdata(); in the sonytest.c file. Basically it needs to be put in a loop so that it will refresh the value for the received code. Hope this helps, Duncan (26 years ago, 7-Apr-99, to lugnet.robotics.handyboard)
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| | 1. Use of sony-ir functions in program; 2. smooth PWM
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Hi everybody! My first question is about using the sony-ir functions in a program: After loading sony-ir.icb and executing "sony_init(1)" at the IC prompt, I can successfully retrieve signals from my sony remote control via the function (...) (26 years ago, 7-Apr-99, to lugnet.robotics.handyboard)
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| | Hack for gearmotors sold by Acroname
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Hi, The SOHO gear motors sold by Acroname have a high gear ratio and are too slow for what I needed (189:1 or something). The front gear cover is removable with two screws and one on the gears (there are 4 metal gears in addition to the small (...) (26 years ago, 6-Apr-99, to lugnet.robotics.handyboard)
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| | Need info PLEASE
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Hi, I have looked around on the mailing list and have not found anything that will answer this question.... I have an expansion board and want to use a 12v 2amp source for my motors. The hack listed in the FAQ is only for use on a handy board only, (...) (26 years ago, 6-Apr-99, to lugnet.robotics.handyboard)
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| | HB encoders question
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Can the HB measure encoder pulses faster than 1 kHz? (this is the speed of the system interrupt) Assume we have an encoder that does 500 pulses per revolution. What happens when we exceed 2 revolutions per second? What happens if the encoder has two (...) (26 years ago, 6-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Quick troubleshooting help please!!!!
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Did you destroy the battery pack? There is an embedded temperature fuse that will blow if you try to charge it too fast or accidently short the battery. With no power applied have a look at the voltage on the battery terminals (you can get to them (...) (26 years ago, 6-Apr-99, to lugnet.robotics.handyboard)
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