 | | Re: Help!! Polaroid problem!!!
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Hey, I just wanted to thank everybody for there help with this, it did turn out to be the pull up resistor problem, I feel like a moron. We used the handyboardy sonar interfacing schematic when we wired it up and failed to realize that we aren't (...) (26 years ago, 23-Apr-98, to lugnet.robotics.handyboard)
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| | examples
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I was wondering if anyone out there could send me some very basic, easy to understand programs that could help me figure out how to use sonar modules. Thanks, Richard (26 years ago, 23-Apr-98, to lugnet.robotics.handyboard)
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| | Re: Help!! Polaroid problem!!!
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Generally the capacitor is the problem :-) The capacitor in the original note is there to pull BINH true* to allow the sensor to detect things that are closer than 18". Generally, when you include it, unless the design of the system holding the (...) (26 years ago, 23-Apr-98, to lugnet.robotics.handyboard)
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| | Re: PWM and encoder
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(...) Are you using the "smooth" PWM motor routines? Note also, that a DC motor does not change velocity linearly with an increase in current unless it is under load. This was a recently asked question on the list. Maybe grepping the digest for (...) (26 years ago, 23-Apr-98, to lugnet.robotics.handyboard)
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| | Re: Help!! Polaroid problem!!!
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(...) residual noise? It was my understanding that the Polaroid module used pulse time differentials to relay distance information. One need only look at the difference in time, between the leading edge of the init pulse, and the leading edge of the (...) (26 years ago, 23-Apr-98, to lugnet.robotics.handyboard)
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| | Trinity College contest report
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Hi all, first, the URL: (URL) went to last weekend's Fire-Fighting Robot Contest at Trinity College, along with my colleague Steve Ocko, who had built a cute robot based on our network-cricket technology (see (URL) for more on that). We spent about (...) (26 years ago, 22-Apr-98, to lugnet.robotics.handyboard)
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| | A few questions....
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First I want everyone to know two things. First I am new to this list. Second, I have moderate knowledge of electronics.... Until about a few weeks ago, I had been working with Basic Stamps 1 and 2. After looking at all the information about (...) (26 years ago, 22-Apr-98, to lugnet.robotics.handyboard)
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| | Re: Help!! Polaroid problem!!!
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oh yeah? Well, what about the capcitor, huh? ;) ---...--- ericson mar Master of Engineering Candidate Project: Mobile Robotics mar@cooper.edu (212)353-4356 Department of Mechanical Engineering The Cooper Union for the Advancement of Science and Art (...) (26 years ago, 22-Apr-98, to lugnet.robotics.handyboard)
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| | Re: PWM and encoder
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Well, actually, it's not power either. Power is V * I. Sorry, it's actually the voltage. ---...--- ericson mar Master of Engineering Candidate Project: Mobile Robotics mar@cooper.edu (212)353-4356 Department of Mechanical Engineering The Cooper (...) (26 years ago, 22-Apr-98, to lugnet.robotics.handyboard)
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| | Re: PWM and encoder
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The 100, 50, 40, etc. are not really "speeds". They are power. It is related to the average voltage level of your output. Speed depends on the torque and characteristics of your motor. You can hold on the the wheel and still drive the motor at 100. (...) (26 years ago, 22-Apr-98, to lugnet.robotics.handyboard)
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| | Re: Help!! Polaroid problem!!!
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When it first worked for me, I used the HB NiCd. I grounded binh and it worked. I used binh to measure like 7 inches and it worked fine too. ---...--- ericson mar Master of Engineering Candidate Project: Mobile Robotics mar@cooper.edu (212)353-4356 (...) (26 years ago, 22-Apr-98, to lugnet.robotics.handyboard)
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| | Re: Serial Communication: HB -> Win95
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To answer my own question, at least partially, here is a Win95 Host program to communicate (single bytes) with the HandyBoard over a serial line: /* Win95 Visual C++ Host Code to talk to HandyBoard */ #include <conio.h> // _outp, _inp #include (...) (26 years ago, 22-Apr-98, to lugnet.robotics.handyboard)
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| | Re: IC stack problem
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(...) The funny thing is, it doesn't complain about arrays smaller than 4x4. All values are stored correctly for an array of size 3x3. What's this 'magic' number 4 then? Jan Sipke van der veen (26 years ago, 22-Apr-98, to lugnet.robotics.handyboard)
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| | Re: loading files with IC
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In fact, that's weird.. I can't answer to that. To me, I'm pretty sure that IC would have gave me an error, like when I try to load a C program without having loaded the ICB containing the special function used by this C program. For example, i (...) (26 years ago, 22-Apr-98, to lugnet.robotics.handyboard)
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| | Re: Handy board help
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You can build a stepper motor controller on a separate circuit board, then remove the motor control IC's off the handy board and use the output signals to control your stepper. Will have to write a program to run it. you will need a min of 4 outputs (...) (26 years ago, 22-Apr-98, to lugnet.robotics.handyboard)
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| | Re: PWM and encoder
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The nonlinearity has to due with the characteristics of your motor. You will find that a single step of power at the low end has a greater effect on the speed than a single step at the high end, as the motor approaches its top speed. The (...) (26 years ago, 22-Apr-98, to lugnet.robotics.handyboard)
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| | Re: Help!! Polaroid problem!!!
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The reason you don't need a pull up resistor for the Handy Board is because the Handy Board has built in 47k pull up resistors on the digital inputs! -----Original Message----- From: MAR ERICSON <mar@cooper.edu> To: Darkman <lroska@cyberus.ca> Cc: (...) (26 years ago, 22-Apr-98, to lugnet.robotics.handyboard)
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| | IC stack problem
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Hello everybody, Is something wrong with this code or is it IC? { int a[4][4], i; for (i=0; i<4; i++) { a[i][i]=i; } } When I type this at the IC prompt it complains: Downloading 79 bytes (addresses C200-C24E): 79 loaded COMPILER ERROR!: 2 extra (...) (26 years ago, 22-Apr-98, to lugnet.robotics.handyboard)
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| | Re: Help!! Polaroid problem!!!
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well....I might be the way you are powering the sensors ??? Maybe luck ???? :)))))) Actually I don't why you don't need any of those supporting parts. A short question ...For what range are you using the sensors (are you using the binh signal) ?? We (...) (26 years ago, 22-Apr-98, to lugnet.robotics.handyboard)
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| | Digitial input problem
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Hi all, i have built a handyboard. It works fine. But on Digital PIN 9 "PAI" i got allways high level (1) during test via "hptest.c". I think i haven´t any soldering problems. That´s wrong ??? bernd klein (26 years ago, 22-Apr-98, to lugnet.robotics.handyboard)
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