P9_5 would get its power from the barrel jack
P9_7 is supplied from the PMIC
PMIC can get its power from USB or P9_5 or the barrel jack
I highly recommend reading the schematic when you design hardware for
the BBB.
can save a lot of head scratching.
On 12/18/2016 10:13 AM, Chris Fink wrote:
> Yes, thank you very much for walking through the examples, I do
> appreciate it. I figured out the solution: for some reason pin P9_5
> ("VDD 5V," the pin the demo says to use to power the PIR) was not
> working. But I discovered that pin P9_7 ("SYS 5V") /is/ working, so I
> used that to power the PIR, and now everything is working perfectly. I
> did play around with the re-triggering, but either setting seemed to
> work pretty well (one setting was more responsive, while the other one
> stayed on the whole time motion was detected). Thanks again for all
> the help!
>
> This is also my first time using a Google Groups message board. Is
> there some way to officially "accept" or "like" an answer, like on
> stackoverflow?
>
> On Friday, December 16, 2016 at 10:41:09 PM UTC-5, Chris Fink wrote:
>
> This is my first time using a BeagleBone Black (it's a Rev C), and
> I started out with the "Blink on-board LED
> <http://beagleboard.org/Support/BoneScript/demo_blinkled/>" and
> "Blink external LED
> <http://beagleboard.org/Support/BoneScript/demo_blinkled_external/>"
> demos, both of which worked perfectly. Then I advanced to the PIR
> Motion Sensor demo
> <http://beagleboard.org/Support/BoneScript/PIRMotionSensor>, and
> I'm quite certain I connected everything just as they said, but I
> can't seem to get it to work.
>
> At first the LED light turned on right away, and I got a constant
> succession of "Motion Detected" messages. Then I realized that the
> code assumed an active-LOW output from the PIR, but my PIR is
> active-HIGH
>
> <https://learn.adafruit.com/pir-passive-infrared-proximity-motion-sensor/>,
> so I changed the lines
>
> *if(x.value === 0){
> b.digitalWrite(led, 1);
> console.log("Motion Detected");*
>
> to instead be
>
> *if(x.value === 1){
> b.digitalWrite(led, 1);
> console.log("Motion Detected");*
>
> In this case the light does _not_ come on, and I get a constant
> succession of "No Motion Detected" messages...and the PIR never
> detects motion, no matter how much I move, or how close I am. I
> even tried a different PIR
> <https://www.virtuabotix.com/product/virtuabotix-pir-motion-sensor/>
> (also active-HIGH), and got the exact same results. I also tried
> removing the pull-up resistor, which also did not work.
>
>
> Then I found this post...
>
>
> https://groups.google.com/forum/#!searchin/beagleboard/pir%7Csort:relevance/beagleboard/ydD2Cyi5fJo/QK0jHa53NMgJ
>
> <https://groups.google.com/forum/#%21searchin/beagleboard/pir%7Csort:relevance/beagleboard/ydD2Cyi5fJo/QK0jHa53NMgJ>
>
> ...which makes me think that the demo isn't working because I'm
> not using the *exact* PIR sensor prescribed in the PIR Motion
> Sensor demo
> <http://beagleboard.org/Support/BoneScript/PIRMotionSensor>. If
> that is the case, where do I purchase that PIR sensor? I cannot
> find a link to it anywhere.
>
>
> Thanks in advance for the help!
>
>
>
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