From: pcdhSpamMeSenseless@electrooptical.net   
      
   On 01/20/2014 12:31 PM, haiticare2011@gmail.com wrote:   
   > On Thursday, January 16, 2014 11:44:28 AM UTC-5, Phil Hobbs wrote:   
   >> On 1/16/2014 11:35 AM, haiticare2011@gmail.com wrote:   
   >>   
   >>> Probably everyone knows this, but the Picaxe is a Pic chip with a   
   >>> Basic interpreter on board - about $3 for the 8 bit 32 mhz   
   >>> version. It is the easiest way to prototype for those who want a   
   >>> quick and dirty prototype.   
   >>   
   >>> The interpreter is slow, so you will end up with a 10 bit A to D   
   >>> conversion that takes 300 microseconds. And an interpreter treats   
   >>> every oommand in isolation, so every command has to set up all he   
   >>> registers and flags over again. In other words, the price for   
   >>> convenience is lack of speed. But if you don't mind the horse and   
   >>> buggy speed, it's the easiest way to go. And the Picaxe has quite   
   >>> a few features - ADC, DAC, PWM, digital counter, settable clock,   
   >>> I2C, etc.   
   >>   
   >>>   
   >>   
   >>> Compare that with the pic24fj128gc010 chip for speed. This 16 bit   
   >>> chip does 10 MSPS 10 bit conversions per sec, or 100 ns. per   
   >>> conversion. The documentation is over 200 pages long.   
   >>   
   >>>   
   >>   
   >>> In most cases, better to prototype with a Picaxe and then go to   
   >>> assembler or C for the final product.   
   >>   
   >>>   
   >>   
   >>> My apologies to anyone for stating the obvious here. Another   
   >>> interesting are is the dedicated, "user friendly" boards for   
   >>> optics measurement. Arduino, Raspberry, and BeagleBone. I haven't   
   >>> seen much ADC capability on them.   
   >>   
   >>   
   >> That sort of stuff I usually do with a laptop and a LabJack.   
   >> Pretty good medicine for lots of things.   
   >>   
   >>   
   >>   
   >> Cheers   
   >>   
   >>   
   >>   
   >> Phil Hobbs   
      
   > Phil, I know you are busy, but you or some doppelganger of you should   
   > give a seminar on noise in electronic circuits. I have found books   
   > like Ott on the practical aspects of noise, but nothing very clear in   
   > theory. jb   
      
   I have some lecture slides for that on my web site,   
   http://electrooptical.net/www/canceller/klugesandhacks6c.pdf ,   
      
   and of course it's one of the main themes of my book.   
      
   Cheers   
      
   Phil Hobbs   
      
      
      
   --   
   Dr Philip C D Hobbs   
   Principal Consultant   
   ElectroOptical Innovations LLC   
   Optics, Electro-optics, Photonics, Analog Electronics   
      
   160 North State Road #203   
   Briarcliff Manor NY 10510   
      
   hobbs at electrooptical dot net   
   http://electrooptical.net   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)