0
\$\begingroup\$

I would like to get a microcontroller out of sleep when the board starts moving (or vibrating). If possible it should just be a passive switch (I only need a positive edge from a battery to get the board started, and I don't care about other behaviour). I was first thinking of a TILT switch, but I think it is a bit too restricted (i.e. 15DEG in a predefined direction...). Think of a bicycle light that should start shining when a bicycle starts moving. However, this is for a big machine. Preferably surface mount. Is there a proper name for those sensors (I keep on hitting on PIR sensors)?

\$\endgroup\$
  • \$\begingroup\$ I'm not sure if you want a PIR sensor - those detect movement in infrared, and the signal requires conditioning for proper detection. Along the lines of a tilt/vibration sensor, I came across this, which is SMT, simple, and small, signalquest.com/product/components/sq-sen-200 (glynstore.com/signalquest-sq-sen-390-tilt-sensor). \$\endgroup\$ – DigitalNinja Apr 8 '16 at 0:51
  • \$\begingroup\$ DigitalNinja, this is indeed what I am looking for, if you put your comment as an answer I will check it. Not digikey sourceable, but that is MY problem :) \$\endgroup\$ – lode Apr 8 '16 at 1:25
  • \$\begingroup\$ I think PIR sensors would not help because it would detect humans only as far as I know...however I may be wrong so first if you would like...do some experiments with Pir sensor whether it would detect ur board or not. \$\endgroup\$ – Jasser Apr 8 '16 at 3:54
  • \$\begingroup\$ no no no, no PIR sensors, this is really very different from what I look for. DigitalNinja sent a great link! That's my answer! \$\endgroup\$ – lode Apr 8 '16 at 6:42
2
\$\begingroup\$

As I mentioned in my comment, PIR sensors work well for detecting movement in infrared (mainly used for human occupancy detection) and require signal conditioning.

I think a tilt/vibration sensor would work well for your application and this one happens to be small, surface mount, and acts like a simple open/close switch. Even one of the applications listed is for "motion trigger wake-up". They come in a few different part numbers which you can look over (there's a "mini" version which is even smaller!). They are kind of expensive when it comes to a board component, and a little hard to find, but you will probably get a price break if you are making a bunch of these boards. If not then it's a one time cost for something that seems to do exactly what you want. I didn't try very hard to find any other stores/distributors that carry it. Maybe you can find some more.

Manufacturer link: https://signalquest.com/product/components/sq-sen-200/

Store: http://www.glynstore.com/signalquest-sq-sen-200-omnidirectional-tilt-vibration-sensor/

Variations:

http://www.glynstore.com/signalquest-sq-min-200-omnidirectional-tilt-vibration-sensor/ http://www.glynstore.com/signalquest-sq-sen-390-tilt-sensor/ http://www.glynstore.com/signalquest-sq-sen-815-tilt-sensor/

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.