 | | Purchase in Miami or Boston
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Hi, can anyone suggest me where to by a Handy Board and the Expansion Board in Miami or Boston, or maybe its better to by it by mail from somewhere else? Fred, just in case, Im using Outlook Express and Im sending this mail with "TEXT without (...) (25 years ago, 5-May-99, to lugnet.robotics.handyboard)
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| | Dumb math question related to Navigation and encoders
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How do you compute, using Handyboard Interactive C, the Sin, Cos, Tan, Arctan, etc. ? Is there some sort of built in math library file that I can use or is it some sort of formula? I want to implement some rough dead reckoning ability and this stuff (...) (25 years ago, 5-May-99, to lugnet.robotics.handyboard)
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| | Re: Expansion board manual
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all info about the exp board is on the web page, at (URL) there some specific info that you are missing? fred (...) (25 years ago, 5-May-99, to lugnet.robotics.handyboard)
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| | connecting an IR sensor to the board
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Hi! We've been trying to connect an ARTEK "photo-electric" sensor. It is the kind that can be used as a switch : it can only "see" a piece of reflective plastic (like the ones found on a bike, or cat's eyes). However, its supposed to work on 12V. It (...) (25 years ago, 5-May-99, to lugnet.robotics.handyboard)
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| | Re: expansion board
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shsc9801@condor.stcl...dstate.edu wrote: <snip> (...) Scott: Do you mean from exp bd J19 to digital 7? - - - Nick - - - (25 years ago, 4-May-99, to lugnet.robotics.handyboard)
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| | Re: Expansion board manual
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Is there an expansion board manual like the handyboard manual? if so, where can i find it? =) thanx in advance chen (25 years ago, 4-May-99, to lugnet.robotics.handyboard)
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| | RE: Battery Status
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Sort of, I've had a FET driving a solid state relay that allowed me to connect the motor batteries to the system to preserve the system in the case of system battery failure. However the robot wouldn't move under that situation since the reason the (...) (25 years ago, 4-May-99, to lugnet.robotics.handyboard)
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| | expansion board
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How does the jumper from the expansion board J19 to digital 7 come into play? Scott Sherman IT Spec. II St. Cloud State University 720 4th Avenue South Academic Computer Services ECC Building, Room 101 (320) 255-4888 (25 years ago, 4-May-99, to lugnet.robotics.handyboard)
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| | Re: Navigation & Encoders
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(...) The angle relative to the x axis is given by: theta = arctan((y2 - y1)/(x2 - x1)) Remember, the tangent of an angle is the length of the opposite side divided by the length of the adjacent side of the corresponding unit right triangle (i.e., (...) (25 years ago, 4-May-99, to lugnet.robotics.handyboard)
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| | Navigation & Encoders
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I know this is not really handyboard specific but hey... Does anybody know the equation for finding a heading (theta) from a current position P(x,y) to a goal position G(x,y). I sure there's a tangent in there somewhere but I've already dredged up (...) (25 years ago, 4-May-99, to lugnet.robotics.handyboard)
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| | RE: Battery Status
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I have quite a few battery discharge curves lying around, and one thing I can tell you is that they are all different. Generally they start at a high voltage, quickly discharge to a normal operating voltage, hold that voltage for a majority of (...) (25 years ago, 4-May-99, to lugnet.robotics.handyboard)
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| | RE: Battery Status
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Has anyone ever tried having a small offline battery that can be kicked in via sofware? When the main power source is nearly exhausted it can be put online and you know approximately how long that emergency supply will last. Mike (...) at (...) (I (...) (25 years ago, 4-May-99, to lugnet.robotics.handyboard)
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| | Re: Battery Status
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(...) battery (...) drop. (...) Umm, yes. But only if the battery is 5volts. Presumably, the voltage regulator on the HB is being supplied with well over ~6.5 volts (usually a 9.6v battery). Thus the output of your divider could be read via an (...) (25 years ago, 4-May-99, to lugnet.robotics.handyboard)
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| | Re: Battery Status
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(...) However, I'd be concerned about this method in the long run. I'm thinking that the discharge rates of some batteries change over time (talking rechargables here), and that may screw you eventually. Of course, I haven't the faintest idea for a (...) (25 years ago, 4-May-99, to lugnet.robotics.handyboard)
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| | RE: Download of PCode and registers
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Eric, You shouldn't need to use the 0d block for normal programs. In fact, 0c is what you are supposed to use. The only time when you need to use the 0d value is when you are burning the board with the "config0c.s19"(I believe that is the file (...) (25 years ago, 4-May-99, to lugnet.robotics.handyboard)
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| | RE: Download of PCode and registers
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Eric, You shouldn't need to use the 0d block for normal programs. In fact, 0c is what you are supposed to use. The only time when you need to use the 0d value is when you are burning the board with the "config0c.s19"(I believe that is the file (...) (25 years ago, 4-May-99, to lugnet.robotics.handyboard)
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| | Re: Battery Status
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[Duncan Orthner] spake unto the ether: (...) But isn't the supply voltage also the reference for the D/A converter? If the reference drifts, the signal through the divider leg will also drift? I remember trying something like this with a variety of (...) (25 years ago, 4-May-99, to lugnet.robotics.handyboard)
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| | Re: Battery Status
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(...) This is usually how it's done. The voltage will drop predictably as the battery discharges. (...) Yes. You could use a voltage divider. You may have to play with the cutoff point a bit, and be aware that nicads experience a rather sharp (...) (25 years ago, 3-May-99, to lugnet.robotics.handyboard)
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| | Dowload of PCode and registers
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I am building a new handyboard and when I attempt to send the PCode to the board using HBDL for Windows I get an error if 0c is put in the register window. However, if I put 0d it works fine, the files load and the handyboard functions properly. Why (...) (25 years ago, 3-May-99, to lugnet.robotics.handyboard)
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| | Battery Status
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Hi, I would like to measure the battery capacity (how much longer can I keep the operating robot, running under the present battery), but I very newbie in regards to electonics... so here are my newbie questions... :) 1) Is voltage; information (...) (25 years ago, 3-May-99, to lugnet.robotics.handyboard)
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