 | | crystals and voltage monitors
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Hi. Does anyone have current part numbers/vendors for the 8MHZ crystal and the U12 Voltage Monitor on the Handy Board? Are the correct values available from digi-key? I saw they carry both crystals and voltage monitors, I just don't want to order (...) (26 years ago, 10-Mar-99, to lugnet.robotics.handyboard)
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| | Vision on the Handy Board?
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Has anyone tried to connect some sort of a camera to the HB? Would I be asking too much of the 6811 processor to do some simple pattern recognition? I was just curious to what extent I could push my board to. Thanks for any info! Bill Denzel Senior (...) (26 years ago, 10-Mar-99, to lugnet.robotics.handyboard)
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| | Re: HB v1.2, IC v3.1 and ir functionality
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Dear Edward, I don't think you need the r22_ir.lis file.The file sony_ir.icb is available at (URL) . Yours sincerely, Nitin (...) (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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| | Re: basic trigonometric functions on the handyboard..
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Dear Berg, You can perhaps express cos^-1 in the forms of a Taylor series and use that series for finding the approximate value. I have however not tried it. There is no math function for inverse cosine.Refer to handy board manual available (...) (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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| | Re: basic trigonometric functions on the handyboard..
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A Taylor series isn't the way to go: they converge far too slowly. Here is a polynomial fit to arccos(x): arccos(x) ~ = 1.5708 - 1.0927 x + 4.358 x^3 - 0.8340 x^5 It differs from the exact value of arccos(x) by no more that 0.08 radians (4.6 (...) (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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| | Re: basic trigonometric functions on the handyboard..
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The attached GIF shows the Taylor series of the arcsin and arccos. arctan=arccos/arcsin. I haven't tried to implement these formulas on a 68HC11. 3 to 4 steps are quite precise already. Jeroen van der Vegt. -----Original Message----- From: Raymond, (...) (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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| | Re: basic trigonometric functions on the handyboard..
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Hi, The taylor for cos^-1 goes: cos^-1(x) = Pi/2- (x + 1/2*x^3/3 + 1/2*3/4*x^5/5 + 1/2*3/4*5/6*x^7/7 ...) (which in fact is simply Pi/2 - sin^-1) The results are very good for small x. For x close to 1 you need many many elements of that series to (...) (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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| | Polaroid Sonar
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Hi all, I don't know the Polaroid Sonar.... Do you have photo of it. Do you have schematics.... Thanks Dperonne@aol.com (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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| | Serial routines for PA7 at 2400 Baud
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Hi, I read somewhere taht if i want to use pa7 with 2400 baud that i'll have to modify the LDAB 37 to LDAB 148. Is this the only change ?? If i try to use this, and i send 0b11111111 on the HB, I get 0b11000000 on the Host (if i try 0b00000000 i get (...) (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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| | Help!
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Hello Everyone! I have a problem with my Handyboard. Until last week everything was ok, but now.. At the moment I can put the Handyboard in bootstrap mode,and download pcode. But I do not get the Interactive C message and the beep! So I guess is a (...) (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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