 | | 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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| | 20 X 4 L.C.D Screen?
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I put in an e-mail yesterday about using a different L.C.D, I made a mistake and said it was a 20 X 8 I meant a 20 X 4. I thought that there was a way to use a 20 X8 L.C.D instead of a standard 16 X 2. My question is is this possible, I thought I (...) (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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| | System time
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Hi, Have anyone developed a system time on the handy board ? Please advice me... Regards, James (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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Wouldn't it be easier to just use the cosine function itself? x = cos y You know x, but you want to find y. Pick a y (maybe 45 deg) and calculate the x. Use successive approximation to determine y within a tolerance. Almost like calculating a (...) (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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| | Re: Polaroid 6500 Sonar Problem
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I would also like to know about this. please respond. =) chen (...) (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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| | Re: HB v1.2, IC v3.1 and ir functionality
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Thanx for the pointer. I got it working with some help from this list. Thanx again, Ed (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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| | basic trigonometric functions on the handyboard..
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Hi. We've been trying to build an algorithm which will allow our HB to travel between given points. We need to use the inverse cosine function (cos^-1), how can we do that? Is there a math library which contains this and other trig functions? (...) (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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| | Interfacing HB with bus abaco.
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Do anyone of you have already used a strange bus called ABACO ? I'd like to know if someone of you met it anywhere. Thanks Stefano Falconetti (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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| | Fw: Rs422/485 to RS 232 interface
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---...--- (...) (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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| | Rs422/485 to RS 232 interface
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Does anyone can suggest me where to find a simple scheme of an interface from Rs422/485 to RS 232 ? I know that a lot of them are on the web, but where exactly ? Thanks Stefano Falconetti (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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| | RE: Polaroid 6500 Sonar Problem
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Hi, On this page ((URL) says to install a .1uF capacitor at C7 on the sonar board. My team basically did everything you are talking about, plus install the cap, and everything seems to work fine for us... hope this helps, I'm not sure what the (...) (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 lookup table will be much faster if you can afford the memory space. -----Original Message----- From: Guy & Gad Berg <gberg@netvision.net.il> To: handyboard@media.mit.edu <handyboard@media.mit.edu> Date: Tuesday, March 09, 1999 3:21 AM Subject: (...) (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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| | Polaroid 6500 Sonar Problem
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I'm having difficulty getting my sonar rangefinder to work properly. I've got a fully operational Handy Board with a fully operational Expansion Board plugged into it (both purchased assembled from Gleason and used extensively already without (...) (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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| | Sharp GP2D05?
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hello anyone tried interfacing the Sharp GP2D05 sensors to the handyboard before? i'm thinking of buying some as i need a reliable and cheap digital(Yes/No) sensor. from what i can understand, there are 4 wires, Vin, Vcc, Gnd and Vout. the Vcc, Gnd (...) (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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| | Re: nonvolatile memory
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(...) Try Dallas Semiconductor. Curt Mills, WE7U hacker.NO_*SPAM@tc.fluke.com Senior Methods Engineer/SysAdmin "Lotto: A tax on people who are bad at math." -- unknown "Windows: Microsoft's tax on computer illiterates." -- WE7U (26 years ago, 8-Mar-99, to lugnet.robotics.handyboard)
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| | Re: nonvolatile memory
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(...) Actually the DS1225Y is a 8Kx8 NVRAM chip. The correct Dallas part for the HB is a DS1230. Another option is the Simtek EEPROM backed (no battery) chips. They have the same package as a standard RAM chip, whereas the higher profile Dallas (...) (26 years ago, 8-Mar-99, to lugnet.robotics.handyboard)
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