 | | Hong Kong
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Hi, As an additional note about buying the HB from Hong Kong, be on the lookout for wire fees or bank draft fees. I have just purchased an HB and the price is indeed good, but I also had to pay a $12-$20 fee for getting the funds to Hong Kong. The (...) (27 years ago, 7-Aug-97, to lugnet.robotics.handyboard)
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| | Re: 3v motors
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With the modification mentioned in the the FAQ, can you power 3V motor at 3V with external power? The FAQ mentions external 6-36V and L293D spec sheet says that the minimum Vs is Vss (which has a minimum 4.5V). The modification doesn't change Vss, (...) (27 years ago, 7-Aug-97, to lugnet.robotics.handyboard)
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| | Re: Obtaining the Handyboard in the UK
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(...) I too talked to Customs and they are typically confused and confusing about import tariffs and such. I was told that the limit was £19 for what that is worth. I would probably just order the damn thing and see what happens. Tax probably won't (...) (27 years ago, 7-Aug-97, to lugnet.robotics.handyboard)
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| | Re: 3v motors
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If you try to regualte the voltage to 3V You will still loose the extra power as in using a resistor. You lose it in the form of heat to be specific. Using a regulator will give you the 3V you need at continuous output. I'm not sure how voltage (...) (27 years ago, 7-Aug-97, to lugnet.robotics.handyboard)
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| | LCD
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Does anyone know if the hb LCD is classed as reflective or transflective.If it is reflective is there a transflective counterpart(i.e. one that can be backlit)? Thank you, Joe Martin Email:joema@mpx.com.au (27 years ago, 7-Aug-97, to lugnet.robotics.handyboard)
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| | RE: 3V motors
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Yes, it is true that altering the duty cycle does not alter the voltage. What it does do it alter the amount of current to the motor. The problem with these motors is that they draw too much current, more than the HB can readily provide them. By (...) (27 years ago, 6-Aug-97, to lugnet.robotics.handyboard)
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| | Re: 3V motors
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Also, something to keep in mind regarding the motor drivers is that "lowering the power" doesn't change the drive voltage. I assume (ok, here's a chink in the argument, if this is wrong, I hope Fred or someone will correct me) that the handyboard (...) (27 years ago, 6-Aug-97, to lugnet.robotics.handyboard)
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| | Interrupts in Interactive C
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There a way from assign to a interrupt some function wrote in interactive C? How I can put the vector (for the SPI for example $FFD8) pointing to my source???? Thanks in advance. German Pablo Gentile Analista de Sistemas ggentile@cvtci.com.ar (27 years ago, 6-Aug-97, to lugnet.robotics.handyboard)
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| | Re: 3V motors
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I too had a problem with 3 volt motors. The issue is the height of the PWM output. If you drive your motor function at 50%, then 50% of 9.6V is still much higher than the 3 VDC for full speed. One way to get some resolution is to modify the supply (...) (27 years ago, 6-Aug-97, to lugnet.robotics.handyboard)
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| | Motors
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Hi. I am running two 3.3V motors with the handy board. Sometimes The motors would just stop running. The leds that indicates the motors are running are still lit. Also the two chips next the motor output gets very hot. The number on the chip is (...) (27 years ago, 6-Aug-97, to lugnet.robotics.handyboard)
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| | MAgentic card readers again...
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Anyone can help me about the way to connect a magnetc card reader to the handy? I use the idea from david negro , that use the SPI port, but i don't can make work the code... Can anyone tell me uf exists other source of that info ont the web?? (...) (27 years ago, 6-Aug-97, to lugnet.robotics.handyboard)
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| | Re: IR output on HB
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No, don't use a transistor! The HB's IR out already has one. But the parallel-with-a-sepa...r-for-each method is correct. -Fred In your message you said: (...) (27 years ago, 5-Aug-97, to lugnet.robotics.handyboard)
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| | Re: IR output on HB
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Run them in parallel, use a transistor. Like so: +5v | +---+---+---+---+---+ | | | | | | \ \ \ \ \ \ / R / R / R / R / R / R \ 1 \ 2 \ 3 \ 4 \ 5 \ 6 / / / / / / -- -- -- -- -- -- \/ \/ \/ \/ \/ \/ -- -- -- -- -- -- HB + | | | | | | \ | | | | | | / (...) (27 years ago, 5-Aug-97, to lugnet.robotics.handyboard)
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| | Re: CdS cells
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[David.J.Dostal@lawrence.edu] spake unto the ether: (...) I just ordered some from Mouser, the smaller of the two physical sizes they have, 3K to 100K I believe are the light/dark resistances. These give analog(PORT) values of about 10 in ordinary (...) (27 years ago, 5-Aug-97, to lugnet.robotics.handyboard)
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| | CdS cells
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hi everyone, I am looking to purchase a batch of CdS photo cells but I think that I need more information before I order. The catalogs (Digi-Key, Mouser, etc.) list several different photocells (different resistances, power dissipation, etc.) and I (...) (27 years ago, 5-Aug-97, to lugnet.robotics.handyboard)
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| | 3V motors
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Mike, I had a similar problem and the solution is not to put a resistor in series with the motors. With the varying amount of current a motor draws, the voltage drop across the resistor will vary as well and the motors will not see a consistent 3V. (...) (27 years ago, 5-Aug-97, to lugnet.robotics.handyboard)
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| | 3v motors
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I have a cute little tracked robot base i want to run from a handyboard, but the problem is that it has 3V motors. The handyboard is set up to power 9v, right? The way i see it, i can either just put a resistor in series with the motor to drop the (...) (27 years ago, 5-Aug-97, to lugnet.robotics.handyboard)
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| | IR output on HB
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Hi, I'm trying to get the ir output on the handy board to power more than 4 LEDs (need to power 6), anything beyond that the ir signals become drastically weak. I have these LEDs wired serially. I'm not too familiar with electronics, so is it (...) (27 years ago, 5-Aug-97, to lugnet.robotics.handyboard)
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| | Re: ? mobile base for handyboard
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Depends on what you want to accomplish. The LegoBug can use otpical sensors to follow a black tape and the smaller 'micro-motors' are better (less play) than the standard 9v motors. check out (URL) for instructions, ordering info and a price list. (...) (27 years ago, 4-Aug-97, to lugnet.robotics.handyboard)
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| | ? mobile base for handyboard
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Can anyone suggest mobile bases for the handyboard. I am looking for something which is reasonably priced and fairly easy to work with (for a "software" type!). Has anyone used the ARBE-ONE? LEGOBug? Thanks. David Naugler (27 years ago, 4-Aug-97, to lugnet.robotics.handyboard)
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