Floating Point Operations

skatj

I'm working on a model aircraft autopilot and I need to calculate the angle of an output vector using the inverse tangent function. I was wondering if there was any way I could do this with a Basic Stamp 2 Module?

I've been told that I'm screwed but I was wondering what my options were. I've already purchased the Stamp 2 so I don't know what I should do know.

metron9

Floating point coprocessor

or

A lookup table

Depending on how accurate you need to know the angle you may need external eeprom

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Think Inside the box first and if that doesn't work..
Re-arrange what's inside the box then...
Think outside the BOX!

skatj

Angle accuracy is not a big deal.

Could you elaborate please? A google on floating point coprocessor didn't yield much. I've heard of it before but I'm not exactly sure how it works.

Bruce Bates

skatj -

If you're speaking of the ARCTANGENT function it IS available on all PBASIC Stamps starting with the Model 2 (BS-2). The function is ATN and details can be found in the PBASIC Help file, or in the PBASIC Reference Manual.

Regards,

Bruce Bates

Franklin

This was the second hit in a google search for floating point coprocessor www.micromegacorp.com/umfpu-v2.html

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- Stephen

Tracy Allen

emesystems.com/BS2math3.htm#ATN_HYP has some information on this, also using CORDIC, emesystems.com/programs/cordic-atn.bpe. The ATN and HYP functions are no longer "undocumented".

P.S. These are integer functions, not floating point. Is there some reason you need floating point?

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Tracy Allen
www.emesystems.com