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Original question:

TIDA-00489 Reference design, motion sensor

TIDA-00489 Reference design, motion sensor

Agile2 Agile2
Prodigy 140 points

Hello,

I design a motion sensor from TIDA-00489 reference design, it includes PIR motion sensor connects with CC1310 RF MCU. So when I test it the PIR sensor output remain always high, so that It can not detect motion within it's area. Then I check output from IRS-B210ST01-R1 IC (It is used in reference design for motion sensing) , the output is 637mV. Then I check waveform of PIR_OUT_HI and PIR_OUT_LOW. I did not change any circuit design and components.

I have attached schematic and waveform of it.

So please suggest some solution for that.

Thanks.  

  • 0
    TI__Guru**** 317180 points
    In the last post on the topic I asked the following questions:
    "I'm not familiar with this circuit but a DC block is placed between the first and second opamp indicating that you can not look at the DC level at the output. You are referring to a level of 16 mV. Is this after the first opamp on pin 1?

    You should monitor the output of each opamp with a scope and plot the response when a movement is happening."

    But never got a feedback.

    Is the scope video showing PIR_OUT_HI and PIR_OUT_LOW? If that is the case, what is the inputs to the last comparator?
  • 0
    TI__Prodigy 600 points

    In order to recommend a solution to the problem you are seeing, it is necessary to find the root cause of the problem.  Below are a couple of preliminary debug steps to try and isolate the problem.

    1) Is the sensor covered during this test or otherwise pointed in a direction away motion or changed in thermal background?  If not, cover the sensor with a box or anything to isolate the board from background motion while performing testing.

    2) If the above yields the same result, try removing R14.  This will tell you if the issue is with the signal chain or with the sensor.  We have seen occasional bad sensors as well as improperly soldered sensors especially if assembled by hand.  Another item to check on the sensor is to make sure the face is clean and free from scratches.

  • 0
    Guru 26200 points
    Hello,

    1) Which signal do you show on scope, what is an amplitude, 3.3V?
    2) Do you use any visible light and UV filters?
    Fresnel lens for PIRs have such filters.
    3) Where V_BATT comes from?
    In my humble opinion, your circuitry cannot be supplied by switching power supplier.
  • 0 in reply to TER
    Prodigy 140 points

    Hello TER,

    Sorry last time I could not reply due to some other work.

    Yes, this video is showing PIR_OUT_HI and PIR_OUT_LOW. I do as you mention in your post. I check output of monitor, then I put lens on Sensor, Now It detect motion.

    Thanks for your valuable suggestion. 

  • 0 in reply to Tomasz Kocon
    Prodigy 140 points

    Hello Tomasz Kocon

    Thanks for your suggestion.

  • 0 in reply to David Stout
    Prodigy 140 points

    Hello David Stout,

    Thanks for your valuable reply. I removing R14 but it is ok. but I did not put lens so I put lens and got steady output and detects motion. Now it's working good.

  • 0 in reply to Agile2 Agile2
    Guru 26200 points

    I started to use lens everyday and that really helps.

    Could you post a video from scope with a motion detection, please?

    Thanks!

  • 0 in reply to Tomasz Kocon
    Prodigy 140 points

    Hello Tomasz Kocon,

    I have attached scope video of motion detection. Sometimes false detection happens but I am getting good result than earlier (without lens). If do you have any suggestion regarding false motion detection than most welcome.

    Thanks.