MPU9250 with PWM logic

[Rahul]

Hello friends,

i am new to embedded programming and trying to learn the new things in embedded for this i am doing 1 project in which i am using mpu9250 with pwm.

is it possible to glow 4 different LEDs using single pwm module having four channels and how it can work at same time for same duty cycle.

i am also using mpu9250 for accelerometer values, how can i change this like if change in x direction then only 1 LED will glow and if change in y direction then different LED will glow.

i was trying by manipulating examples but only one LED is glowing. how can i implement this with proper logic.

please help me with this

thank you

[MANGO]

Hi, Rahul. Before answering, what version of SDK, IDE (Keil MDK 5, IAR EWARM 7, etc.), MCU (nRF52832-QFAA, nRF51822-QFAB) do you use?

After you leave a comment about this, the answer can be more specific.

These are the reasons why;

• Nordic's latest SDK supports MPUxxxx libraries

• the nRF52 MCU has a PWM driver whereas the nRF51 has to use a timer to create a software PWM

Hope to see your comments.

-Best Regards

[Rahul]

hello sir, i am using SDK 11, IDE(keil MDK 5), nRF52832-QFAA

[MANGO]

Hi, Rahul. I have some questions for you.

• My mistake; you can use SDK11 (or SDK14)/components/drivers_ext/mpu6050.

Or this GitHub page (Examples for nRF51 & nRF52 and MPUxxxx) will be useful.

Were you using the external driver library or were you creating codes from scratch to work with the MPU9250?

• Have you tried Nordic's PWM driver example? If you have a development board, like PCA10040, you can observe 4 LEDs being controlled with the PWM driver.

After gathering details, I think devzone community members can answer your question.

-Best regards

[Rahul]

hello sir, i am using SDK11 it also has drivers for mpu6050 but will it work for mpu9250.

i am not using any driver library. yes i also tried pwm driver example but when ever i tried to merge both the example i.e. PWM driver and MPUxx it is not working.

may be i am not clear with my comment if it is please let me know i will try better

[MANGO]

Hi, Rahul. Hmm, I see. Then how about uploading your Keil project in your original question or provide us a remote repository, such as GitHub or Bitbucket, link to see your code?

Without seeing your code, I think it will be hard to go further. Although I don't have an MPU sensor right now, some Nordic devteam members or community members have it to test your code. I will download your code on the PCA10040.

By the way, are you planning to use SoftDevice on your project in the future or are you using the SoftDevice currently?

-Best Regards