 | | Good 9V motor source
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Hi all....I'm looking for a good source of 9V gear motors that i could use with the handyboard for a mobile robot. Currently, i am just using the little 9v motors that came with the board, which i have plugged into the cheap gearbox from a toy tank, (...) (26 years ago, 29-Nov-98, to lugnet.robotics.handyboard)
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| | Re: -1 with sonar routines?
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(...) The elapsed time calculation can result in negative numbers since the system clock wraps back to zero when it's maxed out. If the elapsed time comes up negative, then the sonar_sample() and sonar_closeup() functions return -1. This could be (...) (26 years ago, 29-Nov-98, to lugnet.robotics.handyboard)
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| | -1 with sonar routines?
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What causes a -1 with the sonar routines. I checked about all the connections that I could think of. Any help would be appreciated Thank you, -Peter ---...--- Peter Eacmen Boston Latin School babylongod@usa.net Knowledge is power, power is money, (...) (26 years ago, 29-Nov-98, to lugnet.robotics.handyboard)
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| | stepper motor standard libary
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hi, i need to know that is there any standard libary files in the Interactive C software required if i want to use a stepper motor ? If Yes, how should I porceed it ? rgds, phillip (26 years ago, 29-Nov-98, to lugnet.robotics.handyboard)
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| | Re: Has anyone been experimenting with mapping algorithms?
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For a class project, I found a few alternatives for obstacle avoidance with known areas using evolvable code. You could call it mapping, I suppose, though it maps for a specific type of problems - those that have a "goal" of some sort (I used a (...) (26 years ago, 29-Nov-98, to lugnet.robotics.handyboard)
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| | Re: Has anyone been experimenting with mapping algorithms?
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(...) The two basic approaches are (1) a bitmap, and (2) a list of obstacle coordinates. A bitmap is just a grid of 1's and 0's indicating the presence of an obstacle at each grid point. It can be implemented as a 1-D integer array with a simple (...) (26 years ago, 29-Nov-98, to lugnet.robotics.handyboard)
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| | Has anyone been experimenting with mapping algorithms?
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Hi everyone, We've been reading up on the many different algorithms for mapping an environment using autonomous robots. Has anyone else been trying to figure out the best approach to map an area and it's obstacles using less than 32k of memory? (26 years ago, 28-Nov-98, to lugnet.robotics.handyboard)
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| | Re: Choosing a shaft encoder?
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We're using a track drive system and we're going to be using L.E.D. proximity sensors off of the teeth of the track gears. The tank tracks appear to be very stable but it's still too early in the development to know how repeatable the robot (...) (26 years ago, 28-Nov-98, to lugnet.robotics.handyboard)
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| | Re: Optrex lcd displays
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I must apologize for my last request, upon further investigation I found an excellent resource that answers the questions i posed earlier. For anyone who might be interested, the source can be found at : LCD MODULE TECHNICAL REFERENCE (FAQ) Version (...) (26 years ago, 28-Nov-98, to lugnet.robotics.handyboard)
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| | Re: Choosing a shaft encoder?
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i use US Digital encoders, www.usdigital.com. they are a bit costly, but very accurate, and have quite a few numbers of resolutions. good luck justin (26 years ago, 28-Nov-98, to lugnet.robotics.handyboard)
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| | Optrex lcd displays
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I am trying to interface an Optrex DMC display to a miniboard. What pins besides the data lines need to be connected and to what? Anyone used these displays yet, I have two a one line x 16 characters and a two line x 16 characters. The pin out (...) (26 years ago, 28-Nov-98, to lugnet.robotics.handyboard)
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| | Re: Choosing a shaft encoder?
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(...) hy, I used HewlettPackard shaft encoders HEDL5540 (500 steps per revoltion) with HCTL2020 quadrature shaft counters/decoders. With them you get 500*4=2000 steps per revolution, which is quite a lot. For me They seem to be a good (but not (...) (26 years ago, 28-Nov-98, to lugnet.robotics.handyboard)
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| | Re: Choosing a shaft encoder?
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(...) I've had good results using the Hall-effect magnetic sensors that Patrick Hui sent with my HandyBoard. I glued magnets into three of the six holes in a Lego pulley wheel and glued the sensor into a small Lego brick. I don't know the part (...) (26 years ago, 28-Nov-98, to lugnet.robotics.handyboard)
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| | Re: How to use the addition analog port ?
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You can time share both your digital and your analog so long as your signal update speeds are not critical. Use a 4 to 8 demultiplexing chip for 4 of your digital I/O and an 8 to 4 multiplexer for the other 4. This effectively provides 8 digital (...) (26 years ago, 28-Nov-98, to lugnet.robotics.handyboard)
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| | When people answer a question, I would like to broaden my knowledge as well.
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Please either carbon copy your solutions to me, or the HB mailing list. I see a lot of good questions, but only a very few peoples responses. Thank you, (26 years ago, 28-Nov-98, to lugnet.robotics.handyboard)
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| | Choosing a shaft encoder?
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As a neophyte robot builder and HandBoard user, may I ask for help in choosing the best shaft encoder? What vendor/supplier should I use? The current project is a very simple robot with a goal of accurate navigation. Thanks! (26 years ago, 28-Nov-98, to lugnet.robotics.handyboard)
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| | Re: How to use the addition analog port ?
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these aren't actually additional ports. if you look at the PCB wiring you'll see that they're just connected to regular inputs 0-3. these extra connectors will be used by the expansion board. please look for an official notice regarding the exp (...) (26 years ago, 28-Nov-98, to lugnet.robotics.handyboard)
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| | Print to host computer
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Hi, Does anyone know how to print messages to the host computer while running IC.exe using "printf" statement. Currently, when printf is executed, it print to the LCD. Is it true that the handy board can only work when the LCD is plugged onto the (...) (26 years ago, 27-Nov-98, to lugnet.robotics.handyboard)
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| | How to use the addition analog port ?
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Hi, I need additional port for the analog input. I have used up 7 analog ports and 9 digital ports. Hence, I need additional port from the HD. I came to know that there are 4 extra analog port on the HD just above the analog port 0 to 3. These (...) (26 years ago, 27-Nov-98, to lugnet.robotics.handyboard)
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| | IC source compilation under DOS
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Hi ALL Here is a Good News. I used Visual c++ successfully to compile IC Source code. I am testing it now. Once it is done I will release the project files/modified files to all. Prasad (26 years ago, 27-Nov-98, to lugnet.robotics.handyboard)
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