MPU9250 with PWM logic

RE: MPU9250 with PWM logic

Bjørn Kvaale — Tue, 21 Nov 2017 13:14:12 GMT

Great to hear Rahul! So did that solve your problem? If it did, would you mind accepting the answer as correct (i.e. press the check mark below the up and down arrows on my answer)? Regards, Bjorn

RE: MPU9250 with PWM logic

Rahul — Tue, 21 Nov 2017 13:01:45 GMT

thank sir yes it was like that only

RE: MPU9250 with PWM logic

Bjørn Kvaale — Mon, 20 Nov 2017 13:48:30 GMT

I updated the source code above. Do you mean something like this?

RE: MPU9250 with PWM logic

Rahul — Wed, 15 Nov 2017 13:34:05 GMT

i can easily do that using all the module but how can i do that using single module this is my concern

RE: MPU9250 with PWM logic

Rahul — Wed, 15 Nov 2017 13:32:12 GMT

yes exactly this i want to do

RE: MPU9250 with PWM logic

Bjørn Kvaale — Wed, 15 Nov 2017 13:27:56 GMT

Let me see if I understand this correctly: for example if the mpu value is between a theoretical value of:

0-1.9999, then LED 1 should blink
2-3.9999, then LED 2 should blink
4-6, then LED 3 should blink

Is this what you mean? And the LED intensity should be adjusted based on the MPU value too?

RE: MPU9250 with PWM logic

Rahul — Wed, 15 Nov 2017 13:14:59 GMT

hello sir what i want to do is i wanna use all the channels of single pwm module in different cases like we can use one channel at a time but when the mpu vales changes it should go to second channel then later values changes it should go to third channel like that

RE: MPU9250 with PWM logic

Bjørn Kvaale — Wed, 15 Nov 2017 13:07:10 GMT

I would just look at the main.c file if I were you. I used Keil to compile, but it should work with any of the other compatible solutions too. I placed this example in the SDK 13 folder under "/examples/peripheral/pwm_simple". Otherwise, you will get errors since the pwm example uses other libraries located under the "SDK13/components/libaries" folder.

RE: MPU9250 with PWM logic

Bjørn Kvaale — Wed, 15 Nov 2017 12:59:58 GMT

Hey Rahul. Just got an example working where I am using one pwm instance to increase the duty cycle of the four different leds on the nrf52 dk. Every 10 ms, the LED duty cycle increases by 1% up to 100%. Then, it starts from the beginning I believe. It was based on this simple example (pwm_simple.zip) I found in another devzone case. I've uploaded the source code below if you don't want to give it a try yourself ;)

But if I were you, I would try to start from the pwm_simple.zip example found in the other devzone case and see if you can figure it out yourself. That way, you'll learn more than just by looking at the answer below. Up to you. :)

Update: Source Code for nrf52832

RE: MPU9250 with PWM logic

Rahul — Wed, 15 Nov 2017 12:31:49 GMT

yes like that only

RE: MPU9250 with PWM logic

Bjørn Kvaale — Wed, 15 Nov 2017 12:09:42 GMT

Do you mean like a car brake light for example? So that when you step on the brakes more, the MPU measures more deceleration and more lumens are emitted from the LED's? Kind of like the Lupine Rotlicht for bikes? I'm taking a look at the case now and will get back to you when I find out more.

RE: MPU9250 with PWM logic

Rahul — Mon, 13 Nov 2017 14:10:30 GMT

is there anyway in which we can use channels of pwm seperately

like i need to use 1 pwm channel output somewhere and 2nd channel output somewhere

regardlessly pwm initialization or we have to initialise same pwm module for every channel

RE: MPU9250 with PWM logic

Rahul — Mon, 13 Nov 2017 04:42:09 GMT

it is defined in another file and it is working fine

but how can i merge pwm and mpu so that it can work together.

what i am trying to do is i want to control led brightness as per particular value of accelerometer and for particular range of accelerometer value one led should glow , for different range different led should glow. like 4 different leds for different ranges

RE: MPU9250 with PWM logic

MANGO — Mon, 13 Nov 2017 04:30:19 GMT

Hi, Rahul. ble_mpu_update is not defined in main.c.

Does ble_mpu_update send accelerometer values to a mobile app?

If so, does ble_mpu_update handle error codes when the nRF52 is not connected to a central device (smartphone)?

Hope to see the ble_mpu_update function.

-Best Regards

RE: MPU9250 with PWM logic

Rahul — Mon, 13 Nov 2017 04:21:47 GMT

sorry it was by mistake i have uploaded c file now

RE: MPU9250 with PWM logic

MANGO — Sat, 11 Nov 2017 14:46:50 GMT

Hmm, I was expecting C source files. However, only the Keil project file was found in your GitHub page.

Can you push some codes?

-Best Regards

RE: MPU9250 with PWM logic

Rahul — Fri, 10 Nov 2017 10:10:21 GMT

yes here i the linklink text i am using softdevice currently

RE: MPU9250 with PWM logic

MANGO — Fri, 10 Nov 2017 08:06:04 GMT

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

RE: MPU9250 with PWM logic

Rahul — Fri, 10 Nov 2017 07:27:43 GMT

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

RE: MPU9250 with PWM logic

MANGO — Fri, 10 Nov 2017 06:46:43 GMT

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

RE: MPU9250 with PWM logic

Rahul — Thu, 09 Nov 2017 09:39:46 GMT

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

RE: MPU9250 with PWM logic

MANGO — Thu, 09 Nov 2017 08:47:10 GMT

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