LIS3DH accelerometer temperature reading Moderators: adafruit_support_bill, adafruit

[merlymk]

Hi I am very new to Arduino products and C programming.
I have been using a LIS3DH sensor for vibration monitoring using the I2C protocol and have been successful in data collection. However i have a new requirement of reading temperature data along with the vibration data. In the data sheet for LIS3DH an embedded temperature sensor is mentioned. I have done some research on using registers to read the temperature data but so far i have not had any success. Few queries
1) Can the temperature data be read using the I2C protocol along with the vibration data
2) Do we require an external sensor to be connected to the LIS3DH for temperature measurement
Testing code has been attached.
Note:- There is no vibration call because i did like to take the temperature separately and simulate.

[adafruit_support_carter]

1) Can the temperature data be read using the I2C protocol along with the vibration data

Yes.

2) Do we require an external sensor to be connected to the LIS3DH for temperature measurement

Yes/No/Maybe.

Keep in mind that the temperature sensor on the LIS3DH is internal, so it will be heavily affected by the LIS3DH itself. If you are wanting something closer to ambient air temperature an external temperature sensor may be better.

See datasheet:
https://www.st.com/resource/en/datasheet/lis3dh.pdf
section 3.7 for details about how to enable, configure, and read the internal temperature sensor.

lis3dh_temp.jpg (77.32 KiB) Viewed 52 times

[merlymk]

Hello Team

I have simulated the code and the temperature reading on the serial monitor screen shot is attached.
Notice that temperature reading is constant irrespective of where the sensor is placed.
I am unsure if its the code or the installation.

[adafruit_support_carter]

Make sure you've done this setup also:

lis_temp.jpg (82.47 KiB) Viewed 38 times

The block diagram might help. There are two steps. (1) Enable AD Convert2 and (2) set the Input 3 mux to point to the Temperature Sensor. I think you've only done (2).

lis_block.jpg (42.29 KiB) Viewed 38 times

[merlymk]

Hi I am still having an issue with the temperature display. Screen shot attached.
The temp1 and temp2 data type is int..please suggest if this needs to be changed.

[adafruit_support_carter]

Not sure. Look in the datasheet for specifics on how I2C works with the LIS3DH. You may need to read back both bytes without a stop?