16G Accelerometer

[theavijitsarkar]

Hi @sandeepmistry, Line 184 lib/cc2650.js it says // we specify 8G range in setup. How do i change to 16g or 4g.

[sandeepmistry]

This is currently not supported.

However can be, by adding a API to set the correct bits: http://processors.wiki.ti.com/index.php/CC2650_SensorTag_User's_Guide#Configuration_2

Pull requests welcome ....

[openStove]

Hi sandeepmistry,

I'm not sure to understand, is it possible to set the bits somewhere manually in your code (replace a mask?), or where those bits are to be setup ?

[sandeepmistry]

@openStove try https://github.com/sandeepmistry/node-sensortag/blob/master/lib/cc2650.js#L19 and the link I mentioned earlier. All the code you need to change is isolated in lib/cc2650.js. Note: the SensorTag firmware might have issues, so the docs don't always line up.

[efreiberg]

@sandeepmistry Is it enabling 8G by default on the accelerometer? Looking at https://github.com/sandeepmistry/node-sensortag/blob/master/lib/cc2650.js#L108 it seems it is being set to 2G by using 0x007f for the config characteristic value?

[sandeepmistry]

Hi @efreiberg,

it is being set to 2G by using 0x007f for the config characteristic value?

Maybe, from what I remember there was some bugs in the firmware or documentation when I was looking at it. Maybe this has since been fixed, the 0x007f was the only way I could get things working reliable.

Please tryout other values and report your findings (also mention the f/w version you are using on your SensorTag). Thanks.

[abhatikar]

Hi Sandeep, I am a novice in nodejs.I had a question related to Ti Sensor tag reading MPU9250 data i am trying to understand how to read motion sensor data using gatttool I see in your code you set the config mask as 0x7F which is enabling all axes for all 3 sensors/meters when I try to do this using gatttool, i am not able get any data from the handle associated with AA81* Could you please help ? P.S. Using your nodejs code, I am able to get some values for all 3 sensors/meters.

[abhatikar]

abhatikar@abhatikar-mac:~$ gatttool -I -b 24:XX:89:XX:XX:XX [24:XX:89:XX:XX:XX][LE]> connect Attempting to connect to 24:XX:89:XX:XX:XX Connection successful [24:XX:89:XX:XX:XX][LE]> char-read-uuid f000aa82-0451-4000-b000-000000000000 handle: 0x003f value: 00 02 [24:XX:89:XX:XX:XX][LE]> char-write-req 0x3f 007f Characteristic value was written successfully Notification handle = 0x003c value: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [24:XX:89:XX:XX:XX][LE]> char-read-uuid f000aa81-0451-4000-b000-000000000000 handle: 0x003c value: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [24:XX:89:XX:XX:XX][LE]> Please find the logs for your reference

[abhatikar]

My Firmware revision:1.32 Oct 5 2016 Model: CC2650 Sensor tag