# HUB8735-Ultra can not find BNO055 **URL:** \ **Category:** SDK\ **Tags:** rtl8735b\ **Created:** [September 11, 2026, 5:49am UTC](https://forum.amebaiot.com/t/hub8735-ultra-can-not-find-bno055/5054 "2026-09-11T05:49:34Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![rkuo2000](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.amebaiot.com/rkuo2000/32/1105_2.png) [@rkuo2000](https://forum.amebaiot.com/u/rkuo2000)\ **Post date:** [September 11, 2026, 5:49am UTC](https://forum.amebaiot.com/t/hub8735-ultra-can-not-find-bno055/5054/1 "2026-09-11T05:49:34Z")
Application: OpenDuck Mini V2 Board : HUB8735-Ultra IMU : BNO055 (MPU6050 works) Library : [https://github.com/7semi-solutions/7Semi-BNO055-Arduino-Library](https://github.com/7semi-solutions/7Semi-BNO055-Arduino-Library) Code : [Basic.ino](https://github.com/7semi-solutions/7Semi-BNO055-Arduino-Library/blob/main/examples/Basic/Basic.ino) Message: ```auto $8735b> BNO055 demo ERROR: BNO055 not found ``` Basic.ino modified with the following also failed : if (!imu.begin(Wire, I2C\_SDA, I2C\_SCL)) { Serial.println(F(“ERROR: BNO055 not found”)); ---
**Author:** ![system](https://us1.discourse-cdn.com/flex016/uploads/ameba/original/2X/7/7009caf971627f868f3de3d34312aff2d14c61e3.png) [@system](https://forum.amebaiot.com/u/system)\ **Post date:** [September 11, 2026, 5:49am UTC](https://forum.amebaiot.com/t/hub8735-ultra-can-not-find-bno055/5054/2 "2026-09-11T05:49:36Z")
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**Author:** ![KevinKL](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.amebaiot.com/kevinkl/32/2632_2.png) [@KevinKL](https://forum.amebaiot.com/u/KevinKL)\ **Post date:** [September 11, 2026, 7:01am UTC](https://forum.amebaiot.com/t/hub8735-ultra-can-not-find-bno055/5054/3 "2026-09-11T07:01:04Z")
Hi @rkuo2000 , Could you try to run I2CScanner example to see if BNO055 is detected by HUB8735-Ultra? If yes, please try to use AMB82-mini to see if the issue still persist. If not, you might need to check if the wiring connection is correct, please ensure that pull-up resistors are well connected. Thank you. ---
**Author:** ![rkuo2000](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.amebaiot.com/rkuo2000/32/1105_2.png) [@rkuo2000](https://forum.amebaiot.com/u/rkuo2000)\ **Post date:** [September 11, 2026, 1:42pm UTC](https://forum.amebaiot.com/t/hub8735-ultra-can-not-find-bno055/5054/4 "2026-09-11T13:42:26Z")
Hi, @KevinKL , AMB82-Mini I2CScanner with MPU6050 is OK (I2C address = 0x68) I2CScanner with BNO055 failed (No I2C devices found) XIAO\_ESP32S3\_PLUS WireScan with MP6050 is OK (I2C address = 0x68) WireScan with BNO055 is OK (I2C address = 0x28) ---
**Author:** ![KevinKL](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.amebaiot.com/kevinkl/32/2632_2.png) [@KevinKL](https://forum.amebaiot.com/u/KevinKL)\ **Post date:** [September 14, 2026, 2:56am UTC](https://forum.amebaiot.com/t/hub8735-ultra-can-not-find-bno055/5054/5 "2026-09-14T02:56:16Z")
Hi @rkuo2000 , Thanks for the result. Please give us some time to purchase BNO055 to verify the issue and identify the root cause. Thank you. ---
**Author:** ![KevinKL](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.amebaiot.com/kevinkl/32/2632_2.png) [@KevinKL](https://forum.amebaiot.com/u/KevinKL)\ **Post date:** [September 16, 2026, 2:34am UTC](https://forum.amebaiot.com/t/hub8735-ultra-can-not-find-bno055/5054/6 "2026-09-16T02:34:46Z")
Hi @rkuo2000 Could you test running the BNO055 `Basic.ino` again with the latest pre-release version of Arduino SDK (4.1.1-build20260915)? Thank you. ---
**Author:** ![rkuo2000](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.amebaiot.com/rkuo2000/32/1105_2.png) [@rkuo2000](https://forum.amebaiot.com/u/rkuo2000)\ **Post date:** [September 16, 2026, 3:16am UTC](https://forum.amebaiot.com/t/hub8735-ultra-can-not-find-bno055/5054/7 "2026-09-16T03:16:49Z")
Both BNO055, MPU6050 works, so how do I apply the changes to HUB8735-Ultra ? BNO055 Basic.ino running : ![image](https://us1.discourse-cdn.com/flex016/uploads/ameba/original/2X/3/381fc74e8f211f9e088cc76176c9437319b158a9.png) ---
**Author:** ![KevinKL](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.amebaiot.com/kevinkl/32/2632_2.png) [@KevinKL](https://forum.amebaiot.com/u/KevinKL)\ **Post date:** [September 17, 2026, 6:41am UTC](https://forum.amebaiot.com/t/hub8735-ultra-can-not-find-bno055/5054/8 "2026-09-17T06:41:12Z")
Hi @rkuo2000 , Since HUB8735 is using the older version of SDK, could you try modifying the Wire.cpp and Wire.h according to the latest update? Wire.cpp: [ameba-arduino-pro2/Arduino\_package/hardware/libraries/Wire/src/Wire.cpp at dev · Ameba-AIoT/ameba-arduino-pro2 · GitHub](https://github.com/Ameba-AIoT/ameba-arduino-pro2/blob/dev/Arduino_package/hardware/libraries/Wire/src/Wire.cpp) Wire.h: [ameba-arduino-pro2/Arduino\_package/hardware/libraries/Wire/src/Wire.h at dev · Ameba-AIoT/ameba-arduino-pro2 · GitHub](https://github.com/Ameba-AIoT/ameba-arduino-pro2/blob/dev/Arduino_package/hardware/libraries/Wire/src/Wire.h) Note: Please keep the board define section of HUB8735\_ULTRA Thanks. ---
**Author:** ![rkuo2000](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.amebaiot.com/rkuo2000/32/1105_2.png) [@rkuo2000](https://forum.amebaiot.com/u/rkuo2000)\ **Post date:** [September 17, 2026, 1:40pm UTC](https://forum.amebaiot.com/t/hub8735-ultra-can-not-find-bno055/5054/9 "2026-09-17T13:40:06Z")
Thanks, the revised Wire.h & Wire.cpp for HUB8735-Ultra were verified with BNO055, MPU6050. [HUB8735-ultra/Wire/src](https://github.com/rkuo2000/EdgeAI-AmebaPro2/tree/main/Arduino/HUB8735-ultra/Wire/src)