SmartMotion® MEMS Motion Sensors

We bought CA-SDK. [What I have found] After looking at the code, BluetoothDataReader.java Method synRead() simply looks for the first byte to be a '$' or not and if not it discards the rest assuming that the datastream in out of sync. Once the data stream is found to be in sync the method readData() reads packets of data 23 bytes long and dispositions them in buffers.

2. Questions:
* What calls synRead (), and readData() Where does the process start from ?

Hello,

I have been working on Invensense 9150 SDK since past one month. I am getting the raw data from the sensor i.e accelerometer,gyro,compass etc. I want to fuse the data to get the distance , position of the sensors. I would greatly appreciate any kind of inputs which would lead the accomplishment of the above mentioned. Thanks.

Hi, I am trying to establish communication with mpu9150 ic. I tried to communicate with the ic using 0x68 and 0x69 with appropriate voltage to the AD0 pin. But I didn't get an acknowledgement from the device. All I get for sensor data is just zeroes.

However I found that cout it pin is at 0v. I guess that the 2.2nf capacitor is causing the issue. But still shouldn't I receive acknowledgement when I try to establish connection ? Doesn't that cpout pin corresponds to the working of the acc and gyro sensor and not related to the interface?

Hello
I have a Mpu9250 module with AK.. magnetometer. I have just enabled the bypass bit and them configured the magnetometer . I think that the outputs are wrong. in 14 bit mode i receive [50 30 45] for example when having 90 degrees drift from north. the outputs do not agree whit environmental facts?
any Idea?

Hi Guys,

Does CA-SDK is a 2 layer or 4 layer PCB?

Hi,

I am starting a project where i need two strings consisting of 7-10 MPU-9250 chips, which are connected in a daisy chain ending with a µC.

Is this use-case even possible, and is either I2C or SPI a candidate for this task?

Thanks in davance.

Hi everybody!

For my thesis in step recognisition i am using the MPU6050 and the HMC5883L magnetometer. To get a higher rate of readings i want to abord the method of bypassing the MPU when reading the magnetometer. I want to push data in the FIFO-bufffer, then read everything (acc, mag and gyro) from there via I²C. No DMP or anything is used, Matlab takes care of every calculation later.

Hello,

I want to use the ISZ-2510 in SPI mode. But doesn´t work. Rate is 1MHz.
One question before:What does the I2C_IF_DIS Bit? Do I have to turn it of with I2C before I can use SPI? Would not make sense...

This is my timing when I write:



This is my timing when I read:

Hello everyone
I am working on a project; using mpu9250 on stm32f4 discovery board.
I am trying to configure PWR_1 register and clock source but it does not work.

I do the following :
disabling sleep mode ; writing 0x00 to PWR_1
wait(100 ms)
choosing clock source to one of pll sources ; writing 0x02 ... 0x05 to PWR_1

after such a configuration i have still unstable gyro values and a wrong temperature value.
Any Idea?
thanks

Hi,

MD 6.1 is claimed to be better in the case of tackling drifting problem. We have made sensor board with 6.1 library and 9250. We wonder what is the proper way to test drifting issues. One way I can think of is comparing sensor data with and without calling MPL library. But the problem lies in how to make drifting happen. What we observe about drifting is that it happens now and then.
Any comments?