kriswiner
commented
8 years ago Hi Chris,
If you are not using the display, then yes remove all of the reference to it.
Also, the I2C functions are set up to use the i2C_t3.h library for the Teensy (which I highly recommend). If you want to use Wire.h on the UNO you will need to make some modifications on the wire.begin and wire.readByte, etc functions. The Wire.h versions are commented out in those function, shouldn't be too hard to figure out.
If you want to understand how to change the data rates you are going to have to read the data sheet; I would recommend this anyway if you are going to use this sensor well.
Once you get these issues sorted out, the code will produce fused yaw, pitch, and roll as well as quaternions for you to spew to the serial monitor. After that, writing to an SD card is easy.
Kris
-----Original Message----- From: CJRud [mailto:notifications@github.com] Sent: December 11, 2015 8:25 AM To: kriswiner/MPU-9250 Subject: [MPU-9250] Using MPU9250BasicAHRS with Arduino (#36)
Hi there,
In your description you say that this code is an Arduino Sketch I'm fairly new to coding with Arduino and would love to use your libraries/ code to get fused sensor data coming out of my MPU9250 to be logged onto an SD card
For the time being, I'm taking one step at a time and just want to see the fused sensor values in my serial monitor without any SD card functionality I am using just an Arduino Uno R3 and MPU9250 breakout from Drotek, see link below, but no Adafruit display that is described in the "MPU9250BasicAHRSino" file description When I run the "MPU9250BasicAHRSino" there are obvious problems associated with the fact that I don't have the display libraries/ LCD attached It won't compile The MPU9250 I have is on the default I2C bus address 0x68 and is recognised when running an I2C scanner
I'd like all the functionality you described in the starting comments: "Demonstrate basic MPU-9250 functionality including parameterizing the register addresses, initializing the sensor, getting properly scaled accelerometer, gyroscope, and magnetometer data out Addition of 9 DoF sensor fusion using open source Madgwick and Mahony filter algorithms", just without the LCD display How do I do this?
Could you give any advice (quick step-by-step perhaps) or adapted code that can get this functionality using what I have? I assume it isn't as simple as commenting/ deleting all the calls to the LCD display/libraries? Hopefully your experience can help me out here!
Secondly, I'd like to sample my accel, gyro and mag at a fairly low 25 Hz Looking through the code I found a number of comments talking about setting sample rates for each accel, gyro, mag and temp sensors but was confused as to exactly how to do this There's a lot of code here and I don't want to change something somewhere and have it mess up everything else How do I do this?
If you also have any comments about the feasibility of saving these values to an SD card at 25Hz then I'd be happy to hear them I'm using the Adafruit datalogging SD card shield, see link below I tried a while ago to save from an MPU6050 using DMP to an SD card and the FIFO buffer didn't like it, it kept overflowing and everything was very slow I resorted then to saving only raw sensor values, which worked very well, but I really want to use the fused values for this latest project
Any advice welcomed! Thank you in advance, looking forward to hearing your comments
Best, Chris
Drotek sensor (assembled for I2C): http://wwwdrotekcom/shop/en/home/421-mpu9250-gyro-accelerometer-magnetometer html?search_query=mpu9250&results=3
Adafruit SD shield: https://wwwadafruitcom/products/1141
Reply to this email directly or view it on GitHub https://github.com/kriswiner/MPU-9250/issues/36 . https://github.com/notifications/beacon/AGY1qq00IyLFsk0i6wvq2Z8ABv3t2cQoks5 pOvBKgaJpZM4Gzs4a.gif
andresespinosapc
Hi there,
In your description you say that this code is an Arduino Sketch. I'm fairly new to coding with Arduino and would love to use your libraries/ code to get fused sensor data coming out of my MPU9250 to be logged onto an SD card.
For the time being, I'm taking one step at a time and just want to see the fused sensor values in my serial monitor without any SD card functionality. I am using just an Arduino Uno R3 and MPU9250 breakout from Drotek, see link below, but no Adafruit display that is described in the "MPU9250BasicAHRS.ino" file description. When I run the "MPU9250BasicAHRS.ino" there are obvious problems associated with the fact that I don't have the display libraries/ LCD attached. It won't compile. The MPU9250 I have is on the default I2C bus address 0x68 and is recognised when running an I2C scanner.
I'd like all the functionality you described in the starting comments: "Demonstrate basic MPU-9250 functionality including parameterizing the register addresses, initializing the sensor, getting properly scaled accelerometer, gyroscope, and magnetometer data out. Addition of 9 DoF sensor fusion using open source Madgwick and Mahony filter algorithms", just without the LCD display. How do I do this? The DMP values I'm particularly interested in having are world frame acceleration in x,y,z and absolute Euler angles for yaw pitch roll, if this is possible.
Could you give any advice (quick step-by-step perhaps) or adapted code that can get this functionality using what I have? I assume it isn't as simple as commenting/ deleting all the calls to the LCD display/libraries? Hopefully your experience can help me out here!
Secondly, I'd like to sample my accel, gyro and mag at a fairly low 25 Hz. Looking through the code I found a number of comments talking about setting sample rates for each accel, gyro, mag and temp sensors but was confused as to exactly how to do this. There's a lot of code here and I don't want to change something somewhere and have it mess up everything else. How do I do this?
If you also have any comments about the feasibility of saving these values to an SD card at 25Hz then I'd be happy to hear them. I'm using the Adafruit datalogging SD card shield, see link below. I tried a while ago to save from an MPU6050 using DMP to an SD card and the FIFO buffer didn't like it, it kept overflowing and everything was very slow. I resorted then to saving only raw sensor values, which worked very well, but I really want to use the fused values for this latest project.
Any advice welcomed! Thank you in advance, looking forward to hearing your comments.
Best, Chris
Drotek sensor (assembled for I2C): http://www.drotek.com/shop/en/home/421-mpu9250-gyro-accelerometer-magnetometer.html?search_query=mpu9250&results=3
Adafruit SD shield: https://www.adafruit.com/products/1141