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jrowberg / i2cdevlib

I2C device library collection for AVR/Arduino or other C++-based MCUs
http://www.i2cdevlib.com
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MPU6050_DMP6 example gives erratic values (MPU6050_RAW works great) #332

Open pepelepoisson opened 6 years ago

pepelepoisson commented 6 years ago

Hi, First of all MANY THANKS for this great work. I am experimenting with MPU6050 library (september 23rd version, downloaded yesterday) using an Arduino Mega 2560 and a GY-521 board. MPU6050_RAW works fine. I2C scanner indicates 0x68 address as expected. I have problems with MPU6050_DMP6 example. Code starts OK but gives inconsistent numbers (random values in spite of the fact that the accel is stable on the table), shows FIFO overflow on a few occasions and freezes after about one minute. Details of wiring and serial output copy are shown below for reference. Do you know what is causing this issue? Any test I could make to help narrowing the problem????? Any previous post on this topic maybe???? Many thanks for your help and best regards.

Pascal Prado.

Wiring:

Mega 2560 3.3V > GY-521 VCC Mega 2560 GND > GY-521 GND Mega 2560 GND > GY-521 AD0 Mega 2560 D21 > GY-521 SCL Mega 2560 D20 > GY-521 SDA Mega 2560 D2 > GY-521 INT

Serial print output:

Initializing I2C devices... Testing device connections... MPU6050 connection successful

Send any character to begin DMP programming and demo: Initializing DMP... Enabling DMP... Enabling interrupt detection (Arduino external interrupt 0)... DMP ready! Waiting for first interrupt... ypr 47.00 5.65 -1.16 ypr 137.34 7.39 31.24 ypr 36.56 46.02 41.07 ypr 180.00 -0.33 -0.34 ypr 72.22 44.80 37.85 ypr -104.91 65.12 10.01 ypr -179.94 -15.27 0.63 ypr -139.03 -14.73 12.46 ypr 2.04 -4.61 47.25 ypr -58.69 69.70 -17.63 ypr -50.45 -84.94 4.99 ypr 180.00 0.16 -0.56 ypr 27.51 -59.79 13.81 ypr -16.97 -54.16 9.76 ypr 167.23 3.89 59.01 ypr 88.06 29.17 60.79 ypr -179.99 0.04 13.09 ypr 64.17 12.19 -2.73 ypr -0.23 6.10 32.27 ypr -180.00 -0.13 -4.59 ypr 7.52 0.76 -25.99 ypr 48.46 6.35 -0.66 ypr 89.90 -24.84 -45.26 ypr -26.24 -44.63 32.17 ypr 180.00 -0.28 -0.29 ypr 17.63 -9.72 -80.25 ypr 0.43 66.66 -4.15 ypr -179.93 -14.81 0.55 ypr 41.64 -8.68 24.52 ypr 2.42 -5.29 48.67 ypr 38.86 -50.68 24.01 ypr 24.31 -11.19 -73.76 ypr 180.00 0.15 -0.53 ypr -81.73 -9.25 57.27 ypr 179.18 6.69 49.13 ypr 166.94 4.01 60.27 ypr 123.13 13.91 71.80 ypr -179.99 0.04 14.45 ypr -37.30 49.89 25.36 ypr 51.53 -18.07 18.02 ypr -180.00 -0.13 -4.87 ypr -4.26 5.81 -64.68 ypr 49.96 6.96 -0.21 ypr 89.64 -12.41 -20.89 ypr -53.77 49.36 -36.43 ypr 180.00 -0.25 -0.26 ypr -102.18 -77.17 12.57 ypr 15.12 25.83 -63.08 ypr -179.93 -14.83 0.51 ypr -86.59 -49.31 10.57 ypr 2.77 -5.85 50.09 ypr -54.35 76.02 -7.92 ypr -39.79 65.55 -3.06 ypr 180.00 0.15 -0.53 ypr -19.04 -16.13 9.47 ypr -172.29 -11.49 49.48 ypr 166.90 4.03 60.28 ypr 107.03 27.60 11.07 ypr -179.99 0.04 15.46 ypr -22.50 -34.54 53.16 ypr 48.90 9.10 -7.47 ypr -180.00 -0.13 -4.31 ypr -29.86 33.91 -13.01 ypr 51.46 7.46 0.17 ypr 89.69 5.06 9.25 ypr -15.46 28.13 8.28 ypr 180.00 -0.23 -0.24 ypr 11.26 17.36 -69.43 ypr 6.02 -57.54 10.12 ypr -179.92 -14.78 0.63 ypr -47.87 -40.36 -11.63 ypr 3.08 -6.29 51.50 ypr 47.91 -39.68 20.17 ypr 10.99 -21.63 66.92 ypr 180.00 0.15 -0.53 ypr 25.73 45.25 -44.72 ypr -20.78 -56.12 12.26 ypr 166.87 4.05 60.30 ypr 147.84 9.92 80.07 ypr -179.99 0.04 16.18 ypr -33.68 35.85 42.69 ypr -51.33 41.09 23.80 ypr -180.00 -0.13 -4.20 ypr -175.27 1.07 -75.59 ypr 52.95 7.87 0.51 ypr 89.57 18.10 32.56 ypr 43.66 -72.33 -17.64 ypr 180.00 -0.22 -0.22 ypr -6.08 6.34 73.33 ypr 79.06 9.23 -11.46 ypr -179.93 -14.77 0.53 ypr 27.15 -2.64 50.67 ypr 3.36 -6.66 52.89 ypr -62.26 64.26 -23.97 ypr 39.64 40.89 -22.80 ypr 180.00 0.15 -0.53 ypr 38.38 -79.08 -0.59 ypr 166.17 26.43 49.33 ypr 166.94 4.04 60.34 FIFO overflow! FIFO overflow! ypr 56.27 8.53 1.09 ypr 89.62 -30.54 -59.45 ypr -44.28 42.09 -16.41 ypr 180.00 -0.20 -0.20 ypr 41.72 -39.32 -7.54

pepelepoisson commented 6 years ago

Quick update. (1) The erratic numbers and FIFO overflow problems disappeared when I updated my I2Cdev library (I had a version from 2011 now I have the latest available today). Numbers now look OK. (2) Freeze problem remains. To be investigated further.

dldelaney commented 5 years ago

I am having this same problem - when adding a delay as low as 6 ms at the very bottom of the code, it starts spitting out erratic values.
I've also had the freezing issue where the Arduino seems to just stop looping (no commands are run (print statements, LED turn on/off, etc)), sometimes after just a few seconds (one time it crashed less than a second after starting), sometimes not at all. I can't seem to get repeatable results for crashing the Arduino.

(All this was using the MPU6050_DM6 example code on an Arduino Uno using a fresh download of the I2C and MPU6050 libraries on 8/2/19) VCC->5V GND->GND SCL->A5 SDA->A4 INT->2