 | | Re: Hardware Problems
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(...) All I can add is that is what mine does, and it seemed to break when I hooked up a 'normal' 12V battery charger, which is opposite polarity to the HB charger requirements. According to the diodes in the diagram, this shouldn't be a problem, (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | Re: line following
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(...) This one's pretty easy. Two IR detector/emitter pairs along the bottom, midline of the robot (say, about 1cm or less off the floor). The algorithm is to keep both detectors over the black tape (i.e. a low reflectance reading); if the right one (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | Re: line following
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(...) He have (had?) some robots here at work that were used in the production areas, and they followed a line on the floor. I've not studied them carefully, but I think they work something like this: Two reflective photosensors are aimed at the (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | Hardware Problems
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Hello, I'm having trouble getting my Rev 1.2 Handy Board up and running. It did work once and then the following symptoms: I start the mac based down loader, which download the bootstrap code fine. Both charger board and the handy board's serial (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | store variables in RAM after reset
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Hi guys, I'm new to the interactive C. Does anyone know how to declare an array of variables which can be changed by the program and stored in the RAM and their values stay the same even after reset? Second, I'm aware of something called the (...) (27 years ago, 15-Apr-97, to lugnet.robotics.handyboard)
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| | Expansion interface.
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I have a question about the expansion interface. If it is decided upon the 1Amp 9V transistors...would it be a problem for the HB's 1Amp Voltage regulator or the fuse? (27 years ago, 15-Apr-97, to lugnet.robotics.handyboard)
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| | line following
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Hey all, I'm looking for some ideas on sensors and algorithms for a line following robot (black tape on white floor). If any of you have had some luck at this or know where I can find some info please let me know. Thanks Rajesh (27 years ago, 15-Apr-97, to lugnet.robotics.handyboard)
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| | Re: motor routines in lib_hb.c
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If I'm not mistaken, (someone please corect) those speeds represent the actual shape of the waveform. Let's list some details. 1. Each bit 0 or 1 represents 0V or 9.6V. (or whatever external source) 2. Each bit represents the above voltage for a (...) (27 years ago, 15-Apr-97, to lugnet.robotics.handyboard)
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| | Re: motor routines in lib_hb.c
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(...) Think of them as repeating binary waveforms (they are clocked out the 'enable' pin of the motor chip at 1Khz) so on an oscilloscope speed 2 (third entry) would appear.. time -> 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 (in mS) Vmotor : +--+ +--+ (...) (27 years ago, 15-Apr-97, to lugnet.robotics.handyboard)
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| | Re: motor routines in lib_hb.c
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(...) These 8 bit masks are the most symmetrical way to to organize speeds of 0 through 7/7. You could rewrite the code to accept a byte and use that as the mask, but unless you think it would save space, it's a waste of time. The miniboard routines (...) (27 years ago, 14-Apr-97, to lugnet.robotics.handyboard)
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| | motor routines in lib_hb.c
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Does anyone know why these eight speeds were chosen in lib_hb.c for the motors and what would happen if the code were re-written to allow any speed between 0 and 255? int _speed_table[]= { 0b00000000, /* speed 0 */ 0b00010001, 0b01001001, (...) (27 years ago, 14-Apr-97, to lugnet.robotics.handyboard)
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| | Re: NOTE 04/10/97 10:50:15
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OK, I haven't looked at encoders.asm but if the following doesn't help just send more questions. (...) Sounds about right. (...) TCTL2 sets rising, falling, or both edge modes; TMSK1 arms interupts; IC event sets the TFLG1 register. (...) correct (...) (27 years ago, 14-Apr-97, to lugnet.robotics.handyboard)
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| | QFP sockets
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Hi, Thanks for the response on finding a microcontroller. I have 1 little problem left: if I'm going to use a Motorola 68F333 or the somewhat cheaper 68HC916Y1 I need a conververter from 160-lead QFP (.65 pitch) to an "normal" pinout where I can (...) (27 years ago, 14-Apr-97, to lugnet.robotics.handyboard)
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| | RE: HB books
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Mark Robillard has written 2 good books on robotics. No one has mentioned these books here before, so I though I would list them. Here are the 2 book titles : * Microprocessor controlled robotics * Advanced microprocessor controlled robotics These (...) (27 years ago, 14-Apr-97, to lugnet.robotics.handyboard)
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| | Re: sencdr0.asm
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Yes, but why? Is the contents at ADCTL+X supposed to change? ---...--- 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 (...) (27 years ago, 13-Apr-97, to lugnet.robotics.handyboard)
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| | Fried analog port
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I was taking some measurements of sensors by reading the value on the LCD display. Suddenly poof a burst of smoke came from the analog port (0). Now the only reading I have on that port is 1, but the other ports are fine. Could I have somehow fried (...) (27 years ago, 13-Apr-97, to lugnet.robotics.handyboard)
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| | My Robot, "JERK"
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To those interested: For those who are interested, I have posted pictures of robot at URL = (URL) it isn't totally complete, the construction is, for the most part finished. It is mobile and can almost traverse the maze it was designed for. Thanks (...) (27 years ago, 13-Apr-97, to lugnet.robotics.handyboard)
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| | HB Simple Encoder Routines
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Hey everyone, My partner and I are trying to use the sencdr?.icb and fencdr?.icb routines to keep position measurements of a robotic arm. The encoders are break beam and provide a signal of 4kHz max. We used 4 J-K flip flops to reduce this frequency (...) (27 years ago, 13-Apr-97, to lugnet.robotics.handyboard)
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| | Re: your mail
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I once saw something like this, but it was very complicated to build. There were TWO separate arrangements of your wheel descriptions, and they were hinged from a set of "hips". I believe this is because, as wheel 1 is pivotting over the front edge (...) (27 years ago, 13-Apr-97, to lugnet.robotics.handyboard)
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| | Re: pressure sensors... antistatic foam -Reply
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(...) That's exactly the stuff. I saw a demo of this in class, so I can't give you specifics, but it's the sort of experiment that takes about 6 minutes to try on your own. Note, however, that there are a few different kinds of the foam: i mean the (...) (27 years ago, 12-Apr-97, to lugnet.robotics.handyboard)
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