Storing Multiple Values in one pin.

Ezsynn

I've got a PING))) sensor hooked up onto PIN 15. How do I store multiple Values in one PIN port then use them?

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Mike Green

"multiple Values in one PIN port" doesn't make sense the way you've said it. Can you give a bit more explanation of what you're trying to do?

There are plenty of examples on the Parallax website of how to use the PING))) with a Stamp. Have you looked at them? Like most Parallax products, there are links to the documentation and sample code on the product page in the webstore.

Ezsynn

Mike Green said...
"multiple Values in one PIN port" doesn't make sense the way you've said it. Can you give a bit more explanation of what you're trying to do?

There are plenty of examples on the Parallax website of how to use the PING))) with a Stamp. Have you looked at them? Like most Parallax products, there are links to the documentation and sample code on the product page in the webstore.

I'm trying to Get the Ping to do a distance measure at 5 angles. And store then compare the values.

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Mike Green

The PING))) can't store or compare values. Your Stamp program has to do that. The documentation for the PING))) shows how to make a single measurement. The Stamp Manual shows how to declare arrays. You'd use an array to store each of the distance measurements, then your program can go back and analyze the stored values.

iDave

If you really MUST store all 5 measurments you should use an array like mike said, BUT, if you merely want to store the largest value(to take bot the furthest distance) and at what angle that measurment was found , I used a loop to take the 5 measurements and use 1 variable to hold the biggest one. Following is a copy from my code:

FOR X = 787 TO 2650  STEP 465      '  these values are for the bs2p, bs2 would be different
    C = C + 1
    FOR XY = 1 TO 35
      PULSOUT 14, X
      PAUSE 20
    NEXT
    PULSOUT 15, 13
    PULSIN  15, 1, TIME
    TIME = TIME */ 102           '   FOR BS2P, NOT BS2
    inches = 890 ** time : time = 0
    IF (inches > BIG) THEN     ' THIS IS WHERE COMPARISON IS MADE
     BIG = inches
     XBIG = C
    ENDIF
  NEXT

C = 0    '  C  MUST BE RESET BEFORE ENTERING BACK IN PREVIOUS LOOP

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MovieMaker

iDAVE,

How would you change the code slightly to find the shortest distance instead? that way you could know the furtherest and the closest. Hope you don't mind me asking.

Thanks.

iDave

No problem MovieMaker. Just simply add another -If then- block after the one that finds the biggest distance. Just do the inverse of it and use a seperate variable to hold the lowest.:

IF (inches < LOW) THEN ' THIS IS WHERE COMPARISON IS MADE
LOW = inches
XLOW = C ' XLOW holds at what measurement position( 1- 5) that was taken
ENDIF

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"THE ONLY TRUE WISDOM IS IN KNOWING YOU KNOW NOTHING." - SOCRATES

Phil Pilgrim (PhiPi)

Bear in mind that the shortest of five distance measurements could well be erroneous, due to interference. The longest of five measurements is much more likely to be an accurate value.

-Phil

iDave

So true. I remember i had to add a statement to screen out values of 0. Don't know if it was my initial screwy wiring or wacky interference. LOL

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"THE ONLY TRUE WISDOM IS IN KNOWING YOU KNOW NOTHING." - SOCRATES

Ezsynn

I think I'll Settle with 3 points, How do you get it to measure in centimetres?

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Mike Green

Read the documentation for the PING))). It shows how to do the conversions for different units.