 | | 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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