 | | Re: help about part C3
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use Digikey P6305-ND or P5417-ND. both are 470 uF electrolytics, axial leads (that is, leads sticking out opposite ends) and are 16 mm long and 8 mm in diameter. in other words, they're the right value and they'll fit. F. (...) (25 years ago, 13-Apr-99, to lugnet.robotics.handyboard)
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| | help about part C3
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Can anyone tell me of a good place to get part C3 for the handy board?...DigiKey no longer has it or a replacement. -Jon Schuck (25 years ago, 13-Apr-99, to lugnet.robotics.handyboard)
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| | Has anyone an icb-routine for 9600b serial connection ?
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Hi, i used the serialio.c routines to establish a data connection between the Handyboard and a Linux PC and encountered the same problems already mentioned in the mailing list: 1) Only char by char transmission with sleeps between transmissions (...) (25 years ago, 13-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Servo DEinitialization.
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Sorry. I'll reread the documentation. I was going by memory. Fred G. Martin Fred G. Martin (...) Ross Tonkens (25 years ago, 13-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Servo DEinitialization.
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(...) as it says in the docs: init_expbd_servos(int action) If action is zero, servo control signals are disabled. If action is non-zero, servo control signals are enabled. Control signals are disabled by default every time the Handy Board is reset. (...) (25 years ago, 13-Apr-99, to lugnet.robotics.handyboard)
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| | 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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