 | | Re: Faulty Digitals
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it might be the processor, but more likely there is a board short connecting the dig ins to ground (input 7) and pwr (input 8). measure resistance between the inputs and the gnd and pwr rails to check. fred (...) (25 years ago, 23-Apr-99, to lugnet.robotics.handyboard)
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| | Electrolytic Capacitor Ratings [was Re: Choosing Parts?]
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Date: Thu, 22 Apr 1999 13:21:14 -0700 From: Chuck McManis <cmcmanis@mcmanis.com> Kind of. Electrolytics are indeed made by plates in a conductive solution, however when the voltage increases, it pulls the plates together (standard columbs law (...) (25 years ago, 22-Apr-99, to lugnet.robotics.handyboard)
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| | Faulty Digitals
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Greetings all! I've got a Handy Board with the expansion board, and the first and second digital ins (digitals 7 and 8) aren't working. 7 is stuck in 0, and 8 is stuck in 1. I replaced everything on the board but the processor itself, and I'm not (...) (25 years ago, 22-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Electrolytic Capacitor Ratings [was Re: Choosing Parts?]
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(...) Also (generally) usually less than 1uf (...) and generally >= 1uf (25 years ago, 22-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Electrolytic Capacitor Ratings [was Re: Choosing Parts?]
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Kind of. Electrolytics are indeed made by plates in a conductive solution, however when the voltage increases, it pulls the plates together (standard columbs law stuff). When you exceed the rated voltage the force on the plates is enough to pull the (...) (25 years ago, 22-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Electrolytic Capacitor Ratings [was Re: Choosing Parts?]
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Generally, cost, accuracy, size, and drift. Ceramic caps are expensive ($/pf) reasonably stable across temperature and acceptably accurate. Electrolytic capacitors are cheap ($/pf) only moderately stable across temperature changes, polarized, and (...) (25 years ago, 22-Apr-99, to lugnet.robotics.handyboard)
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| | smooth PWM!!!...!!!
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hi everyone, i like to ask something on the PWM of the handboard. if i only do a command: motor(2,50); motor(3,50); i will get a smooth PWM of 500 Hz of waveform.( -_-_-_-_ something like this) but if i implement the above command into a program (...) (25 years ago, 22-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Electrolytic Capacitor Ratings [was Re: Choosing Parts?]
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As long as we are talking about caps, I cannot find the information about why one uses tanatlum caps vs ceramic caps vs electrolytic. What are the differences between the various types? Thanks, Gary Livick (25 years ago, 22-Apr-99, to lugnet.robotics.handyboard)
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| | Re: I hope someone can help me...
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(...) If it is the note I posted, also get the followup. The initial post I think I made a couple errors, and then someone said their chips got hot :-o. Anyway a followup post corrected the information. (...) If you look at the pinouts for the 293 (...) (25 years ago, 22-Apr-99, to lugnet.robotics.handyboard)
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| | RE: Electrolytic Capacitor Ratings [was Re: Choosing Parts?]
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Sorry to say, but the capacitance does change depending upon the applied voltage. As you increase the plate voltage a force is created pulling the plates together. This effectively INCREASES the capacitance. The good news is that this enhancement is (...) (25 years ago, 22-Apr-99, to lugnet.robotics.handyboard)
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| | I hope someone can help me...
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I am planning on getting some LMD18200 motor driver chips from National Semiconductor and I found some info about which pins go to what by doing a search in the H-Board archive. Great resource by the way. It expalains how to take one of the standard (...) (25 years ago, 22-Apr-99, to lugnet.robotics.handyboard)
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| | Polaroid Sonars
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Hi everyone, It seems that the world's Polaroid Sonar reserve is almost depleted. Polaroid is currently in the manufacturing process to produce more. The company www.acroname.com still has them in stock if anyone is interested. ---...--- ericson mar (...) (25 years ago, 22-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Electrolytic Capacitor Ratings [was Re: Choosing Parts?]
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Capacitance is calculated using the area of the plates, the dielectric constant, and the distance between the plates. It does not have anything to do with the voltage. If a thicker dielectric is formed, it will reduce the capacitance. This is not (...) (25 years ago, 22-Apr-99, to lugnet.robotics.handyboard)
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| | RE: new intranet ip
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(URL) now points to the new site also. Doug -----Original Message----- From: mark williamson [SMTP:markw@tabnet.com] Sent: Friday, March 19, 1999 2:42 PM To: Andy Stevens; Brad Davis; Brendan Benzing; Caitlin McGillicuddy; Carlie Ross; Chris (...) (25 years ago, 22-Apr-99, to lugnet.robotics.handyboard)
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| | Electrolytic Capacitor Ratings [was Re: Choosing Parts?]
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(...) listed (...) Your comments aren't taken as being harsh, but I'm still not sure I agree. Now I must say that my comments are based on something I heard in the rummer mill, but it still sounds plausible. What I heard goes like this. Electrolytic (...) (25 years ago, 22-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Polaroid Sonar
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Greetings, Acroname has them on their parts list, though I am not certain if they have them in stock (www.acroname.com). Marco A. A. de Oliveira assfalk@eece.unm.edu /---...---| /---...---/ CNPq Scholarship Awardee | | Research Asst. | | | ACE SMR (...) (25 years ago, 22-Apr-99, to lugnet.robotics.handyboard)
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| | handyboard clock speed
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Ive checked the mailing list archives and i cant find a simple answer to the following question: Is it possible to run the HB at >2Mhz? That is, can I run a different version of the 6811 perhaps and get 8Mhz? What are the advantages/disadvantages? (...) (25 years ago, 22-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Mobile Robot Question
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(...) Can anyone answer all that? I think the answer is "it depends". Unfortunately it depends on so many variables that you'll just have to implement one system at a time, checking each thoroughly and modifying as you go. Make sure to go back and (...) (25 years ago, 21-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Polaroid Sonar
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(...) The Mondotronics Robot Store was selling them, but the price wasn't great. Instead of about $50 per transducer/board combo, they were selling pairs for $150 last time I checked. -- Will , , __@_/ \_@__ |/ | /__, o @_/ )\ ) ( \ (\/\\, ~~~...~~~ (...) (25 years ago, 21-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Choosing Parts?
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(...) I don't mean to be harsh, but this isn't exactly correct. The voltage is the highest the capicitor is rated for. if you have a 12V circuit it won't hurt to put in a 200V cap, but you'll need lots of room. Generally for safty, in high current (...) (25 years ago, 21-Apr-99, to lugnet.robotics.handyboard)
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