We are using BMM150 Magetic sensor for our project
1. For BMM150 magnetic sensor is calibration is required before getting the data from sensor.
2. How to do BMM150 sensor calibration ? please provide the source.
3. We are able to get HIGH and LOW threshold interrupt for positive micro tesla value. How to get interrupt for negative values ?
Thanks for the reply.
1. How to configure interrupt for negative x,y,z values because the threshold variable in the BOSH BMM150 driver file is "uint8_t low_threshold".
2. We placed the sensor in ground but at different place and position we are getting different values. will the magnetic field will vary based on place and position or any calibration is required for sensor ?
There was BMM150 example code in github, you could refer and run it.
The magnetic field environment at different locations is different and needs to be calibrated. As you designed a project, it is better to contract with you distributor to apply for magnetic calibration algorithm. Magnetic calibration algorithm was provided as SW library.
The low threshold example uses a 0x0A value, which corresponds to 10 in decimal, so 10*6 = 60 uT is the low threshold limit the example have set, but it doesn't specify whether it's a positive or a negative limit, or for which axis the limit is.
/*! low threshold limit */
/*! high threshold limit */
Both low and high threshold limit are uint8_t, so I have the same problem. Have you figured out how to use a negative limit in order to get a interrupt?