LIS3DH as movement/tilt sensor

Id At · ‎2018-02-05

Posted on February 05, 2018 at 19:54

Hi ALL, I bought the LIS3DH development kit.

I want to use it as a sensor that will wake my MCU with interrupt when someone moved my board or tilt it.

I have some constrains:

1. I need low consumption current with my current bat.

2.I can't assume what is the initial condition that the board will be.

3.I want to control the sensitivity.

I tried a lot of option with the development kit but all of them didn't give me the desiered situation.

will you help me understand if the LIS3DH is the right choice for this task and suggest solutions?

thank you!

Miroslav BATEK · ‎2018-02-09

Posted on February 09, 2018 at 17:14

Here are my answers:

1. If you will power the device by higher voltage that Vdd (max) the device will work but the parameters are not guaranteed.

Exposure to maximum rating conditions for extended periods may also

affect device reliability. I would recommend you to use voltage regulator.

2. If you set the condition to high OR

low, than it is always true.

That is the reason why the interrupt is always triggered. Please be aware that the absolute value of the acceleration is compered with the selected threshold (for the threshold interrupt) so in your case only 'high' condition should work fine.