PIR Sensor #555-28027 and the debug window.

edited April 2007 in BASIC Stamp Vote Up0Vote Down
I am using the PIR Sensor #555-28027 and playing with the sample code that comes with it as seen below:
' =========================================================================
' File...... PIR_Simple.bs2
' Purpose... Show Output State Of PIR Sensor
' Author.... Parallax, Inc.
' E-mail.... support@parallax.com
' Started... 12-14-2005
' {$STAMP BS2p}
' {$PBASIC 2.5}
[noparse][[/noparse] Program Description ]

' This program displays the current state of the PIR Sensor connected to P9
' on the DEBUG screen.
[noparse][[/noparse] Program Code ]

DEBUG HOME, BIN1 IN9 ' Display Status Of P9 At Home Pos.
PAUSE 100··········· ' Small Delay
LOOP················ ' Repeat Forever

I have the sensor set to High which does this:
Output remains HIGH when sensor is retriggered repeatedly. Output is LOW when idle (not triggered).
I have the Basic Stamp 2P40.
I have the sensor wired up with an LED on its output to verify that the sensor is indeed triggering.· However I am stumped with the zero in the debug window when my sensor is triggered or not.


  • 3 Comments sorted by Date Added Votes
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited April 2007 Vote Up0Vote Down
    Are you connected to P9 on the BASIC Stamp? MAIN or AUX bank? Also, how much current is the LED drawing? The output wasn’t really intended for that purpose.

    Chris Savage
    Parallax Tech Support
    Chris Savage | Engineering Tech | Main Office: (916) 624-8333 | Direct to Tech Support: (888) 997-8267 | Website | Twitter | Google+
  • curious1curious1 Posts: 104
    edited April 2007 Vote Up0Vote Down
    Hey Wrath......,

    ·I used an led too... but put it on it's own output pin with a 470 resistor.

    Use code to make out high to Led when PIR is sensing.

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