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Virtuabotix PIR motion sensor problem– could I have a bad one?

 

Hello,

I have the virtuabotix PIR motion sensor, that I want to use with the FRDM-KL46Z board.  Upon tripping the sensor it should turn on the on-board and external LEDs on.   However it doesn’t.

I hooked up the  sensor to an oscilloscope and a DMM to check out the high and low logic voltages.  High output is 3.3v and low is 2.8-3.0v.  The input voltage is set to 4 volts.

Also, when I trip the sensor, the output stays high for  a very long, if it does, no matter where I set the latch pot.

Do I have a bad sensor or am I doing something wrong?

 

Thanks,

 

Donato

4 Answers

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A couple questions, first it sounds like you are powering the board at 4 volts, have you tried powering it with 5 volts? The output should be at 3.3 volts, but the low should be below 2.0 volts. Minimum latch time is two seconds, so if you can’t get it to latch at 2 seconds then you may have a damaged control knob.

Let me know what happens when you put the PIR motion sensor on a 5V rail, and if it still isn’t working I can help you debug further or get you a replacement.

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Thank you for the quick response.  I will try this weekend, if not Tuesday at school I will be working with it!

 

Thanks again!

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Hi Mr. Datillo,

I found out the problem, it was not the sensor, it was the board.  Even though it was sending out a 5v output the board didn’t accept it as a logic 1.    I had to change the code to accept the signal as analog, then the code translated it to a digital 1.   It works great now!

 

Thanks,

 

 

Donato

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Whoops!  I meant 3.3 V  signal!

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