 | | Re: Servo DEinitialization.
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I'd go for the Coke can idea. Sounds like a surer shot. I thought init_expbd_servos(x), where x = integer from 0 to 5, was used to initialize the servos individually. Stupid me. I've been using init_expbd_servos(5), and, since I only had #5 hooked (...) (25 years ago, 13-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Expansion Board Servo timing...
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Hi Doc, The function call "init_expbd_servos(0);" turns them off, "init_expbd_servos(1);" turns them on. Something like "servo5=2300;" commands a servo to a position, but only if the servos are initialized as per above. Maybe I used a confusing term (...) (25 years ago, 12-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Desgning H-bridge
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The motor driver circuit is a bipolar push-pull current amplifier. It's really cheap, easy to build and works well with the Tamiya motor/gearbox kits available from (URL) or (URL) I'm sure it has its limitations, but works for small robot projects. (...) (25 years ago, 12-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Expansion Board Servo timing...
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How do you "de-initialize" a sevo? I am only familiar with the init_expbd_servos(x) command and with reassigning the servo(x) global variable to effect servo repositioning. Ross M. Tonkens, M.D. Medical Director Primary Care of Nevada 100 North (...) (25 years ago, 12-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Expansion Board Servo timing...
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(...) I don't know about the servo routines on the HB, but servos *do* start to jitter when the pulses get much below about 20Hz. This is not due to the pulse width 'fluctuating', it's because the refresh rate is dropping. It certainly is possible (...) (25 years ago, 12-Apr-99, to lugnet.robotics.handyboard)
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| | 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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