On Tue, 20 Nov 2001, Gareth malham wrote: > try again? http://malcam.fucx.co.uk/ just checked it
No ... still am getting a name lookup error. Don't know why. > Well the idea is to be able to record a day from midday to midday in a > single flat image with a view to capturing the movments of tides. That could be interesting. I'd certainly like to see the results when you get this working! > I'm unsure about stepper motors and what they do? Any good links would be > appreicated It is a motor that rotates a certain amount depending on the application of a pulse or a binary code. There are lots of designs, the simplest being a ratchet on a shaft driven by an electromagnet. Usualy though it a motor designed without a commutator. You energize the coils and the rotor rotates until it aligns with the field coils. If you treat the field coil switching as a binary code you can drive the motor by sending it a string of binary coded words. Figured if you were already planning to use an embedded microprocessor this might be a good approach. That way the microprocessor has control of the motor speed and length of rotation. You can search the web for stepper motor info. One URL I dug up that looks pretty good is: http://www.cs.uiowa.edu/~jones/step/ > Just a simple PIG processor Not familiar with that one. Don't suppose you have a URL I could look at? > which will read voltage from a photo cell inside the camera and adjust > the pol filters to keep nthe voltage constant, this is somthing which > my father, who is an electronic engineer will help me with. Sounds like a servo motor with an analog lead/lag feedback control might be more apropos. It would at least eliminate the need for A/D sampling and the possible need to do D/A conversion for your servo control (unless you used a stepper motor). Of course noise could be an issue. Either way should work. - Wayde ([EMAIL PROTECTED]) _______________________________________________ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
