GPy with BNO055 - I2C bus error

Reply to GPy with BNO055 - I2C bus error on Wed, 11 Apr 2018 17:01:28 GMT

sprasad — Wed, 11 Apr 2018 17:01:28 GMT

I'm trying to interface the bno055 breakout board (by adafruit) with my GPy module. I'm using following micro python library for bno055 https://bitbucket.org/thesheep/micropython-bno055/src

Upon running the code shown below, following error is got 'OSError: I2C bus error' with a mention of some line numbers in bno055.py and functools.py. However, i2c scan returns the correct device address as 40 (0x28). How can I proceed?

from machine import Pin, I2C
import time
import bno055

i2c = 
I2C(0, I2C.MASTER, baudrate=1000, pins=(Pin.exp_board.G15, Pin.exp_board.G16))  
print(i2c.scan()) #Prints "[40]"

s = bno055.BNO055(i2c)
print(s.temperature())
print(s.euler())
i2c.deinit()

Reply to GPy with BNO055 - I2C bus error on Wed, 11 Apr 2018 17:32:16 GMT

livius — Wed, 11 Apr 2018 17:32:16 GMT

@sprasad said in GPy with BNO055 - I2C bus error:

'OSError: I2C bus error' with a mention of some line numbers in bno055.py

which line?

and do you use SD card? I ask because you set in i2c init non standard pins - one is from SD card data0.
Also do you use some externall pullups on i2c line?

Reply to GPy with BNO055 - I2C bus error on Wed, 11 Apr 2018 21:06:57 GMT

sprasad — Wed, 11 Apr 2018 21:06:57 GMT

@livius here is the complete error

Traceback (most recent call last):
  File "", line 10, in 
  File "bno055.py", line 46, in __init__
  File "bno055.py", line 91, in init
  File "bno055.py", line 108, in reset
  File "bno055.py", line 107, in reset
  File "bno055.py", line 104, in reset
  File "functools.py", line 5, in _partial
  File "bno055.py", line 63, in _register
  File "bno055.py", line 51, in _registers
OSError: I2C bus error

I'm not using SD Card. I'm just using some random pins, no relation as such with anything else.
I'm not using any external pullups as well.

Reply to GPy with BNO055 - I2C bus error on Thu, 12 Apr 2018 08:09:32 GMT

seb — Thu, 12 Apr 2018 08:09:32 GMT

@sprasad said in GPy with BNO055 - I2C bus error:

bno055

do you have external pull up resistors?

Edit: your last post says you dont, try adding some

Reply to GPy with BNO055 - I2C bus error on Thu, 12 Apr 2018 08:23:36 GMT

livius — Thu, 12 Apr 2018 08:23:36 GMT

@sprasad
try on default baudrate
baudrate=100000

Reply to GPy with BNO055 - I2C bus error on Wed, 18 Apr 2018 14:47:05 GMT

sprasad — Wed, 18 Apr 2018 14:47:05 GMT

@livius I2C device isn't detected at this baud rate. i2c.scan() returns an empty list.

Reply to GPy with BNO055 - I2C bus error on Wed, 18 Apr 2018 15:03:14 GMT

sprasad — Wed, 18 Apr 2018 15:03:14 GMT

@seb Adafruit documentation says pullups are already present on SDA and SCL pins.
SCL - I2C clock pin, connect to your microcontrollers I2C clock line. This pin can be used with 3V or 5V logic, and there's a 10K pullup on this pin.
SDA - I2C data pin, connect to your microcontrollers I2C data line. This pin can be used with 3V or 5V logic, and there's a 10K pullup on this pin.

Reply to GPy with BNO055 - I2C bus error on Wed, 18 Apr 2018 17:31:05 GMT

livius — Wed, 18 Apr 2018 17:31:05 GMT

@sprasad
can you show some picture of your setup? It is soldered or simple wires?
Did you checked some basic steps like properly connected wires especially GND from sensor to GND to the board?

Reply to GPy with BNO055 - I2C bus error on Thu, 19 Apr 2018 18:40:01 GMT

MarcoBenini — Thu, 19 Apr 2018 18:40:01 GMT

@sprasad said in GPy with BNO055 - I2C bus error:

I2C(0, I2C.MASTER, baudrate=1000, pins=(Pin.exp_board.G15, Pin.exp_board.G16)) > ```

Expansion board G15 and G16 are P8 and P9.
P8 is the SD_Data, but You don't use the SD card, the P9 on expansion board is the "led" pin.
Try removing the led jumper "enable led signal" on expansion board to disable it.