 | | Re: basic trigonometric functions on the handyboard..
|
|
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)
|
| |
| | Re: basic trigonometric functions on the handyboard..
|
|
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)
|
| |
| | Polaroid Sonar
|
|
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)
|
| |
| | Serial routines for PA7 at 2400 Baud
|
|
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)
|
| |
| | Help!
|
|
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)
|
| |
| | 20 X 4 L.C.D Screen?
|
|
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)
|
| |
| | System time
|
|
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)
|
| |
| | RE: basic trigonometric functions on the handyboard..
|
|
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)
|
| |
| | Re: Polaroid 6500 Sonar Problem
|
|
I would also like to know about this. please respond. =) chen (...) (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
|
| |
| | Re: HB v1.2, IC v3.1 and ir functionality
|
|
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)
|
