AUTOMATICALLY ACTIVATE GPS WHEN IT DETECTS MOVEMENT

RE: AUTOMATICALLY ACTIVATE GPS WHEN IT DETECTS MOVEMENT

helsing — Mon, 20 Jul 2020 09:55:13 GMT

Hi Raquel,

I have discussed this with my team and here are a few things to start with.

[quote user=""]1) The device is in sleep mode until it detects a movement.[/quote]

I heard that there is some code for ADXL362 for Thingy:52 that is worth checking out. I would also recommend to look into the details of the sensor as it has some nice features for waking up. Like programming the two interrupt pins according to the requirements of your application. The sensor has a FIFO that allows you to analyze and verify if the movement that triggered the interrupt is what you actually want to detect and not only some strong vibrations. Also, if you want to do some serious power saving you could design your hw to use the interrupt from the sensor to enable necessary power rails on your board. Solder a bridge on the board if you want to use Int2 from the sensor.

[quote user=""]2) When it detects a movement with the accelerometer it searches for LTE communication and activates the GPS automatically.[/quote]

Will you be using eDRX or PSM? Here is a relevant thread on the topic https://devzone.nordicsemi.com/f/nordic-q-a/63075/nrf9160-psm-and-edrx-modes. More info on the two modes over at Link-Labs: PSM or eDRX.

Check out set_gps_enable in long_press_handler which starts and stops the gps link in asset_tracker. You could perhaps modify this and make it into something like a "wake on movement handler"? For example, if motion from the accelerometer then wake from PSM, connect to base station and activate GPS. Please also check out aGPS(which is using less current and has a faster TTFF(time to first fix)).

[quote user=""]4) The device must have the GPS active and send position until a command is received (e.g. press the button).[/quote]

nRF91 sleeps in PSM mode when GPS is active. You can then wake up from PSM to send over LTE. This should be the principle but I have not yet checked the details.

Let me know what you think.

Best regards,

Håkon

RE: AUTOMATICALLY ACTIVATE GPS WHEN IT DETECTS MOVEMENT

rqLST — Sun, 19 Jul 2020 09:49:48 GMT

Hi,

I'm currently working with v1.3.0 .

RE: AUTOMATICALLY ACTIVATE GPS WHEN IT DETECTS MOVEMENT

helsing — Fri, 17 Jul 2020 08:54:57 GMT

Which ncs tag are you on?

RE: AUTOMATICALLY ACTIVATE GPS WHEN IT DETECTS MOVEMENT

rqLST — Thu, 16 Jul 2020 12:13:10 GMT

Hi,

Thank you for the feedback.

RE: AUTOMATICALLY ACTIVATE GPS WHEN IT DETECTS MOVEMENT

helsing — Thu, 16 Jul 2020 12:10:46 GMT

Hi Raquel,

Sorry for the long wait. We are still working on this.

Best regards,

Håkon

RE: AUTOMATICALLY ACTIVATE GPS WHEN IT DETECTS MOVEMENT

helsing — Thu, 09 Jul 2020 09:45:40 GMT

Hi Raquel,

Thanks. I will look into this as well.

Best regards,

Håkon

RE: AUTOMATICALLY ACTIVATE GPS WHEN IT DETECTS MOVEMENT

rqLST — Wed, 08 Jul 2020 12:18:57 GMT

Hi,

I'm running tests on my own while I'm waiting for your help. I also wanted to ask you the following to continue my tests:

Working on the asset_tracker example in the main.c: when the following line appears
#if IS_ENABLED(CONFIG_GPS_START_ON_MOTION)
It is disabled, so the condition of #if is considered not to be satisfied.
However, it should be configured because in the file prj_thingy91_nrf9160ns.conf it is enabled.

I would like to be able to activate the part of the code that runs with the condition :

#if IS_ENABLED(CONFIG_GPS_START_ON_MOTION)

because it might solve part of my problem.

Thank you!

RE: AUTOMATICALLY ACTIVATE GPS WHEN IT DETECTS MOVEMENT

helsing — Mon, 06 Jul 2020 19:28:57 GMT

Hi Raquel,

I have started looking at this and I will get back to you.

Best regards

Håkon