Multiple Sets of Analog Readings

[kalfred]

I am writing a worksheet that collects an analog voltage measurement and converts it to feet per minute (Volts * 400 = fpm) at multiple locations. I am outputting the result to a text file along with the time (in seconds).

So the flow goes like this…

1. Set up measurement probe at Position 1
2. Start data collection
3. Data collects 1 per second for 20 seconds, then stops (pauses)
4. Move probe to Position 2
5. Start data collection
6. Data collects 1 per second for 20 seconds, then stops (pauses)
7. Repeat 4 – 6 until data has been collected for 12 locations.
8. Output file is *.csv or *.txt including: Position, Second (1-20), Velocity

Output looks like this:

Measurement time[s],Face Velocity [fpm],

0,64,

1,64,

2,65,

3,63,

4,63,

Here’s where I’m having difficulties…

I need to be able to collect this data for 20 seconds, pause, collect for 20, pause, collect for 20, etc. until I have 12 sets of 20. I know that I can put in a “STOP” control and stop after either 20 seconds or 20 data points and then press collect again to append data to the file. This also works fine. However,  I would like to record which data set is being collected (Let’s call it Location, since I am collecting data from multiple locations) in the output file. Like this:

Location, Measurement time[s],Face Velocity [fpm],

1,0,64,

1,1,64,

1,2,65,

1,3,63,

1,4,63,

1,5,64,

1,6,64,

1,7,65,

1,8,63,

1,9,63,

1,10,64,

1,11,64,

1,12,65,

1,13,63,

1,14,63,

1,15,64,

1,16,64,

1,17,65,

1,18,63,

1,19,63,

2,0,64,

2,1,64,

2,2,65,

2,3,63,

2,4,63,

2,5,64,

2,6,64,

2,7,65,

2,8,63,

2,9,63,

2,10,64,

2,11,64,

2,12,65,

2,13,63,

2,14,63,

2,15,64,

2,16,64,

2,17,65,

2,18,63,

2,19,63,

Etc….

I would appreciate any help I can get.

[CJ_Butler__DASYLab_Pro]

how do you identify the location? 

Maybe a coded switch that you can save to the file? that gives you up to 16 locations, and you can label the buttons ( I would use buttons or a drop down) with words, while saving the number. The numbers don't have to be 0-15 - you can put any value for each switch position.