 | | Re: Desgning H-bridge
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(...) Kam has a design at: (URL) (25 years ago, 12-Apr-99, to lugnet.robotics.handyboard)
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| | Re: H-bridge
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I am currently in search of H-bridges (DC motor drivers) I tried visiting wirz electronics but they aren't in business right now. does anyone know of any other places i can check out? =) thanx Chen (25 years ago, 12-Apr-99, to lugnet.robotics.handyboard)
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| | Expansion Board Servo timing...
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How sensitive are the exp bd servo routines to many processes running concurrently. My servo works fine in a stand alone test file but when I include it in my main code it gets the "nervous shakes", as if the timing pulse is fluctuating ( I don't (...) (25 years ago, 12-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Expansion Board Servo timing...
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Drew- I have a Handy Board on a robot that runs three servos and the GP2D02 sensor, and I have the same nervous jitters problem. However, I do not run any processes on this application. I am using IC under v 3.2 of the software, so I could use (...) (25 years ago, 12-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Rangingproblems with Sharp GP2D02
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(...) I'm looking at the Sharp data sheet, and they have a chart that shows decimal distance measuring output vs distance to object in centimeters, and they indicate the minimum reading to be around decimal 59 to 64 depending on object reflectivity. (...) (25 years ago, 12-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Desgning H-bridge
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Another great source for h-bridge design if (URL) It gives details on how to build a PIC based motor controller, but more importantly, it has a great h-bridge schematic. Be sure to check it out. ---...--- Brian Schimpf schimpfy2@aol.com (25 years ago, 12-Apr-99, to lugnet.robotics.handyboard)
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| | Rangingproblems with Sharp GP2D02
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Hi all I just finished rewriting the GP2D02 routines by Kent. Seems all to work just fine....except that I don't get readings below around 55. Even if I don't have anything in front of the sensor (dist. to wall more than 2m) I never get a reading of (...) (25 years ago, 12-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Desgning H-bridge
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Hey Ericson, Check out the following sites for motor control information: (URL) under motor control Hope this helps, good luck! --kam (URL) Mon, 12 Apr 1999, MAR ERICSON wrote: -->Where can we get info in designing H-bridges from descreet (...) (25 years ago, 12-Apr-99, to lugnet.robotics.handyboard)
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| | Desgning H-bridge
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Where can we get info in designing H-bridges from descreet components? Is it sufficient to use just four MOSFETs or just four solid state relays? Thanks for any input. ---...--- ericson mar Robotics Consultant mar@cooper.edu (212)353-4356 Department (...) (25 years ago, 12-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Smooth PWM for IC3.2?
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(...) This problem is the only reason why I'm not buying the commercial version of IC. I'd buy in an heartbeat if *all* the code running on the handy board was available. Until then I stick with the free version. So far I've modified my pcode at (...) (25 years ago, 12-Apr-99, to lugnet.robotics.handyboard)
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| | Re: GCC/HC11 small patch
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(...) I added his patch into my patch and it is now available for download: ftp.eskimo.com/u/a/a...est.tar.gz I've also updated the readme to include the latest copyright information (everyone released it under the GNU Public License), and included (...) (25 years ago, 12-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Increasing current output to motors on HandyBoard
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Actually, if you have been following this thread, there are several ideas that have come up, including the solid state relay (reliable, high current, but SPST, moderate cost ), transistor to up the current(reliable, mded current, low cost, but (...) (25 years ago, 12-Apr-99, to lugnet.robotics.handyboard)
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| | HB_IR.C: which ports?
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Hi everybody, I'm experimenting with Kent Farnsworth's program for IR detection (files hb_ir.c and hb2_ir.icb). In Kent's program there is a function ir_counts(integer argument), where the argument can have the value 4, 5, 6 or 7. I've found that (...) (25 years ago, 11-Apr-99, to lugnet.robotics.handyboard)
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| | Smooth PWM for IC3.2?
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Hi everybody, I have IC3.2 and want to use the smooth PWM functions. I've already adapted my lib_hb.c file. If I use the pcode_hb.s19 file adapted for smooth PWM (downloaded from Fred Martin's site), everything works ok, only I end up with IC2.8! (...) (25 years ago, 11-Apr-99, to lugnet.robotics.handyboard)
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| | part C3????
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I need a reliable easy source to purchase part C3 online...digikey says it's obsolete and they have no substitute. Can anyone help??? -Jon (25 years ago, 11-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Increasing current output to motors on HandyBoard
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Hi, Anyone know where I can purchase a commercial unit that I can operate automobile starter type relays from the COMOS outputs on the handyboard expansion board? only 5 mA per output. Or would it be eaiser to fabricate? I don't want to damage the (...) (25 years ago, 11-Apr-99, to lugnet.robotics.handyboard)
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| | Re: multitasking
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(...) The subroutines continue execution exactly where they left off, making the multitasking transparent to you. You normally shouldn't have to give any thought to how many ms each one gets. If timing is important to you for some reason and the (...) (25 years ago, 11-Apr-99, to lugnet.robotics.handyboard)
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| | multitasking
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I have a simple question regarding multitasking. I am using two subroutine in a multitasking. start_process(ir()); start_process(detect()); Both subroutine should run for 5 ms(default). Consider an example that the subroutine detect() require more (...) (25 years ago, 11-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Increasing current output to motors on HandyBoard
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Total cost for both, $56.00. Smaller ones are cheaper. Again, the advantage is convenience, not cost. These pulg right into the motor driver output ports on either the Handy Board or the Rug Warrior with the L293D left in place, and take no other (...) (25 years ago, 10-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Quick troubleshooting help please!!!!
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I would also check the circuit traces. Clip an ohm meter to the battery ground and check all the ground points, then do the same for +battery. Take a magnifying glass to the traces you can see. Look for places where the smoke got out. Once the (...) (25 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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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 (...) (25 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 (...) (25 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 (...) (25 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: { (...) (25 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 (...) (25 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 (...) (25 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 (...) (25 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 (25 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 (...) (25 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 (...) (25 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 (25 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 (...) (25 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, (...) (25 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 (...) (25 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 (25 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 ---...--- (...) (25 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 (...) (25 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. (...) (25 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 (...) (25 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 (...) (25 years ago, 9-Apr-99, to lugnet.robotics.handyboard)
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