serial 4-channel 8-bit A/D

Comments

• Bruce Bates Posts: 3,045

  2005-03-10 19:18 edited 2005-03-10 19:18

  Maxb -
  
  I can find no mention of a 4-channel A/D chip on Professor Anderson's web site, which is what I presume you're speaking about when you mention Morgan State. I can only guess that it's a unit that has been discontinued and there is no documentation for it on his web site.
  
  If this chip operates in a similar manner to the way his 8-channel A/D chip operates, I suspect you can add the following line of code to your existing program, right before the existing SERIN statement in your program:
  SEROUT 8, 84, 'Send any character to begin the data conversion
  
  and that should start the data conversion process. Since I have no documentation, you're on you own after that, presuming that works as I hope it will.
  
  Regards,
  
  Bruce Bates
• Maxb Posts: 16

  2005-03-10 21:41 edited 2005-03-10 21:41

  thank you mr. Bates
  for your reply,
  I appreciate,
  
  I tryed what you said,
  but ....same thing,
  no debug messages
  
  I plugged and tryed to receive a signal from ADC 0831, and something strange happened. I decided to switch of program, to go back on the Morgan program, and for the first time
  while pressing the reset buttom,I received some results from my last program. After 5-10 sec. it stopped.
  My debug box shows " debugger pane", what does it mean?
• Maxb Posts: 16

  2005-03-10 22:48 edited 2005-03-10 22:48

  Yapidu : )
  
  I resolved my problem by replacing my "broken"
  BS2
  by another one from the lab..
  
  isn't that great..." !
• Bruce Bates Posts: 3,045

  2005-03-10 22:52 edited 2005-03-10 22:52

  Maxb -
  
  You may want to take a look in the Parallax PBASIC Stamp Manual at how DEBUG operates. In order to see any output from the DEBUG command, you must have a DEBUG window OPEN. Once it is open, anything sent via the DEBUG command will appear in that window. Once the program completes, the DEBUG window can be closed.
  
  The manual can be downloaded from the following link and is free:
  http://www.parallax.com/html_pages/downloads/basicstamps/documentation_basic_stamp.asp
  
  Some further notes. When using the ADC0831 you must use SHIFTIN, not SERIN to access the data Thus, if the Morgan chip uses SERIN, those two chips are not interchangable without modification of the program. The ADC0831 is also just a single channel device.
  
  Regards,
  
  Bruce Bates
• Stuarttttt Posts: 45

  2005-03-17 22:11 edited 2005-03-17 22:11

  Bruce,
  
  When interfacing the temp sensor, whats the advantage of using an ADC0831 in the Industrial control experiments, rather than just using the RCtime command ?
  
  Regards
  Stuart
• Bruce Bates Posts: 3,045

  2005-03-17 22:59 edited 2005-03-17 22:59

  Stuart -
  
  Without actually running a test case my best guess would be greater accuracy and faster response. Among other things there's no charge time required to wait for the capacitor to charge up when using RCTIME. That's not to say the results are instantaneous with an ADC, as there is a conversion time required as noted in the data sheet.
  
  Regards,
  
  Bruce Bates