Ping sensor and Datalogger

Comments

• Franklin Posts: 4,747

  2011-01-14 21:15 edited 2011-01-14 21:15

  When you are writing you are using a variable called counter. Where is this when you are reading?
• bsnut Posts: 521

  2011-01-15 00:58 edited 2011-01-15 00:58

  I noticed some possible problems with code that you provided and have some questions for you.
  
  1) Why did you comment this out of the code?

  'inDistance      VAR     Byte                   ' Number Of Samples To Log
  

  
  2) I understand why you did this. But, did you remove any other code above or below this?

  PULSIN 3, 1, time
  

  
  What, I would do is connect the demo circuit up has shown at top of the program code and change to this to see if it takes of your problem.

  RCTIME 3, 1, time
  
• Tabiri Posts: 23

  2011-01-17 17:33 edited 2011-01-17 17:33

  I copied and pasted in some of the code that I got for the ping sensor. The inDistance was the variable that would display the distance in inches. However, I was running out of space for variables, so I had to comment that out. The " 'Number Of Samples To Log" was originally right after the variable NumSamples.
  
  The program was originally for a light sensor or thermistor, but since I didn't have one of those, I had to change it to accept the ping data. All I changed was where it gathered the data, and replaced result with cmDistance.
  I got the program working (I had forgotten to replace the result variable in a few places) and I uncovered a new problem. The first measurement it displays on opening the file seems to be a number around the maximum measurement. Then it just moves the rest of the measurements down one space, and never displays the original sample 10.
  example:
  Memory Stick Datalogger Demo V1.0
  
  Initializing...Done!
  Synchronizing...Done
  Switching to Short Command Mode...Done!
  Waiting for Memory Stick...Ready!
  Opening Data File...Open!
  
  Writing Data...
  Sample 00001 of 00010 --> 00075
  Sample 00002 of 00010 --> 00075
  Sample 00003 of 00010 --> 00075
  Sample 00004 of 00010 --> 00038
  Sample 00005 of 00010 --> 00040
  Sample 00006 of 00010 --> 00037
  Sample 00007 of 00010 --> 00035
  Sample 00008 of 00010 --> 00036
  Sample 00009 of 00010 --> 00075
  Sample 00010 of 00010 --> 00042
  Closing Data File...Done!
  
  Opening Data File...Open!
  Reading Data...
  Sample 00001 of 00010 --> 00079
  Sample 00002 of 00010 --> 00075
  Sample 00003 of 00010 --> 00075
  Sample 00004 of 00010 --> 00075
  Sample 00005 of 00010 --> 00038
  Sample 00006 of 00010 --> 00040
  Sample 00007 of 00010 --> 00037
  Sample 00008 of 00010 --> 00035
  Sample 00009 of 00010 --> 00036
  Sample 00010 of 00010 --> 00075
  Closing Data File...Program Complete!
• bsnut Posts: 521

  2011-01-18 01:10 edited 2011-01-18 01:10

  What I would do, is run this test code first that came with Ping sensor to make sure that it is preforming correctly.

  ' Smart Sensors and Applications - PingMeasureCmAndIn.bs2
  ' Measure distance with Ping))) sensor and display in both in & cm
  ' {$STAMP BS2}
  ' {$PBASIC 2.5}
  ' Conversion constants for room temperature measurements.
  CmConstant CON 2260
  InConstant CON 890
  cmDistance VAR Word
  inDistance VAR Word
  time VAR Word
  DO
  PULSOUT 15, 5
  PULSIN 15, 1, time
  cmDistance = cmConstant ** time
  inDistance = inConstant ** time
  DEBUG HOME, DEC3 cmDistance, " cm"
  DEBUG CR, DEC3 inDistance, " in"
  PAUSE 100
  LOOP
  

  From, what I see in the above test code, you will need to comment this

  inDistance = inConstant ** time
  

  back into your code to get your program working the way you want it too.
  I think it will provide you with better results if you tried it.
• Tabiri Posts: 23

  2011-01-18 23:07 edited 2011-01-18 23:07

  Alright thanks. It seems to be working good now.
• bsnut Posts: 521

  2011-01-19 00:30 edited 2011-01-19 00:30

  I am glad you got it working and that's what we are here for.