Multiple BNO085 with Sparkfun Library

Sensors IMU & Motion
1

Hi there!

I’m trying to use Sparkfun’s BNO08x library with a couple of BNO085 boards but It only recognizes the first one I initialize and not the second one. Is it posible to use this library with multiple devices?

This is what I’m implementing now:

#define BNO08X_ADDR_A 0x4B // SparkFun BNO08x Breakout (Qwiic) defaults to 0x4B

#define BNO08X_ADDR_B 0x4A // Alternate address if ADR jumper is closed

BNO08x myIMU_A;

BNO08x myIMU_B;

myIMU_A.begin(BNO08X_ADDR_A, Wire, BNO08X_INT, BNO08X_RST);

myIMU_B.begin(BNO08X_ADDR_B, Wire, BNO08X_INT, BNO08X_RST);

Any input would be appreciated.

2

Which BNO085 are you using?

3

i’m using Adafruits BN085 breakout. It’s the only one I could source locally.

4

Did you pull DI high on the second board? In I2C mode, that pin changes the address

5

Yes, and there are both definitely with the two different addresses. If I change the initialization order I can talk to the other one but it’s always the first one.

I simplified the code in th first post a bit, I check for the initialization and if it failed I locked up the code in a while(1), just as the library example does. The first device goes through the initialization ok (regardless the address) and the second one gets locked up.