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The Handyboard seamed to work fine for the last few days. Sudently today I got this -POWER GLITCH- message when runing the HB with just IC loaded in it. What does it mean ??? I thought it could be a loose connection or something similar but even if (...) (28 years ago, 16-Aug-96, to lugnet.robotics.handyboard)
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| | Re: Musings regarding Handyboard Expansion & Interfacing
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(...) Dallas 1202 for example, or other models from dallas semi. The data sheets are on their web site ((URL) from memory) There is a example of code for the stamp at: (URL) Seront, seront@seism1.ess.sunysb.edu (MIME ok) (URL) (28 years ago, 14-Aug-96, to lugnet.robotics.handyboard)
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| | Re: Musings regarding Handyboard Expansion & Interfacing
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(...) One of them "smart sockets" (I think dallas makes 'em). Put it in under the RAM chip, no extra wiring necessary. Just some special code :-). (28 years ago, 14-Aug-96, to lugnet.robotics.handyboard)
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| | Musings regarding Handyboard Expansion & Interfacing
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Just got Aug issue of Circuit Cellar. Full of robotics goodies & interface circuits . In the meantime, following are some more of my thoughts on interfacing. ***...*** * MUSINGS ON THE SUBJECT OF HANDYBOARD INTERFACING * ***...*** * Special (...) (28 years ago, 14-Aug-96, to lugnet.robotics.handyboard)
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| | Musings regarding Handyboard Expansion & Interfacing
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***...*** * (More) * * MUSINGS ON THE SUBJECT OF HANDYBOARD INTERFACING * ***...*** * Multiplexed digital I/O * * Sharing those valuable IC and OC pins * ***...*** Expanding a "clever" handyboard I/O line (an IC or OC or PA I/O) into several (...) (28 years ago, 13-Aug-96, to lugnet.robotics.handyboard)
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| | Re: Pulse Accumulator
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(...) How long did it work before? Have you checked the solder and socket connections of the chips in the circuit? Sometimes chips shift in their sockets and incur additional impedance in a connection, causing problems. Is your board subject to (...) (28 years ago, 12-Aug-96, to lugnet.robotics.handyboard)
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| | Pulse Accumulator
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Hello everyone, The pulse accumulator on my handyboard no longer is working. It was working fine, and then the next minute it just stopped... Can I just reaplce the HC11 to fix the problem? Thanks.. joeo@symtec.com (28 years ago, 12-Aug-96, to lugnet.robotics.handyboard)
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| | Re: Servo question
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(...) One thing to note, not all servos are designed to turn 180degrees. The ones designated as "retract servos" are designed to turn 180 degrees, the rest are designed for something around 90degrees. Most can be modified to turn as far as you want (...) (28 years ago, 12-Aug-96, to lugnet.robotics.handyboard)
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| | Pulse Accumulator
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My Pulse Accumulator no longer works... Does anyone know how to fix it? I was using it to measure RPM, and it was working fine...the next minute it just completely stopped working... Can I just replace the HC11? Thanks.. Joeo (28 years ago, 12-Aug-96, to lugnet.robotics.handyboard)
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| | Re: piggyback pentium/powerPC
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(...) Try looking for embedded PC systems. The motherboard are sometimes roughly the size of the HB. You may have to buy controller board also to drive a hard drive or a Solid state disk. Expensive stuff! The good thing about some embedded systems (...) (28 years ago, 12-Aug-96, to lugnet.robotics.handyboard)
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| | Re: Servo question
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(...) You need to go into the servo.c file, and adjust the minimum and maximum frequencies the servo can handle. If you open servo.c, you'll find instructions as to how to do this. You pretty much just have to adjust the program to suit your servo, (...) (28 years ago, 10-Aug-96, to lugnet.robotics.handyboard)
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| | Servo question
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hello everyone I'm playing around with a servo on the HB. i loaded all the progs and got it to twirl, but it won't do a full 180 degrees. i'm just using the servo() command. i suppose servo(1400) is supposed to point it 0degress, but it points about (...) (28 years ago, 10-Aug-96, to lugnet.robotics.handyboard)
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| | Re: bootstrap quirk
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(...) Thanks for the suggestion. Unfortunately, the behavior is the same regardless of whether the interface board is connected to my computer. (...) I believe it is working fine, as the previous tests of it were passed. I did have a problem where (...) (28 years ago, 10-Aug-96, to lugnet.robotics.handyboard)
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| | (no subject)
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More MUSINGS follow. Seeing as my job gets progressively more MANAGEMENT than TECHNICAL these days - is it really inevitable over the years?? - this software/electronic/mechanical exercise called robotics seems a good hobby to do all those things (...) (28 years ago, 9-Aug-96, to lugnet.robotics.handyboard)
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| | Re: IR transmission
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(...) Well actually, even though it's not a precision resistor, when I installed it, I grabbed a bunch of resistors and measured each one with my DMM until I found one which was between the 3.74 and 3.83 values Fred specified. To further test this, (...) (28 years ago, 8-Aug-96, to lugnet.robotics.handyboard)
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| | How to add more IC lines?
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Hi, all It appears that the proposed expansion board will not have any additional input capture functions. I've run out of Input Capture lines on the Handyboard, so does anyone have a suggestion on which processor could best be slaved to the (...) (28 years ago, 8-Aug-96, to lugnet.robotics.handyboard)
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| | Re: IR transmission
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(...) Did you tried to remove the resistor? I actually simply fitted the IR diode in the female header. I found that the red diode beside the header would light less if the IR diode is emitting, since those two diode are installed in parallel. The (...) (28 years ago, 8-Aug-96, to lugnet.robotics.handyboard)
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| | Re: IR transmission
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Also... For Tx I use a high power IR LED with about a 5-10ohm resistor (I can't remember exactly) Because the carrier is 50% duty and the signal is not continuous, this is ok. If you use a lower powered IR LED and/or a higher resistor, you may find (...) (28 years ago, 8-Aug-96, to lugnet.robotics.handyboard)
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| | Re: IR transmission
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Jeff, You are right. Several things could be wrong here. First of all the precision resistor is VERY VERY important. This controls the frequency of the carrier signal. The freq is approx 1/(RC) where R = R4 and C = C6 of the the Handyboard IR Tx (...) (28 years ago, 8-Aug-96, to lugnet.robotics.handyboard)
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| | Re: DC10 turning
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(...) A partial solution which I found is effective in turning a tracked platform on carpet, is to run the pivot tread in the same direction as the turn tread but at a much slower rate. This worked quite well with a Radio Shack Sherman Tank, but the (...) (28 years ago, 8-Aug-96, to lugnet.robotics.handyboard)
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