Managing Roll Angle Readings from a BNO055 Sensor

What will you learn?

In this tutorial, you will learn how to effectively manage roll angle readings from a BNO055 sensor to prevent inaccuracies when the angle surpasses its maximum or minimum threshold. By implementing a smart adjustment strategy, you’ll ensure smooth transitions and accurate angular data processing in your embedded systems.

Introduction to Problem and Solution

Navigating the intricacies of handling roll angles with precision is crucial when working with sensors like the BNO055. The challenge arises when these angles reach their limits and need to be managed intelligently to avoid inconsistencies. This guide dives deep into addressing this challenge head-on, offering practical solutions and insights into managing angular data effectively.

A Brief Overview

Embark on an informative journey where we explore how to manage roll readings from a BNO055 sensor seamlessly. By understanding the nuances of angular measurements and implementing smart adjustment strategies, you’ll not only solve immediate challenges but also enhance your expertise in working with orientation data in embedded systems.

Understanding the Problem and Solution Strategy

The key challenge lies in handling angular measurements within specific boundaries without disruptions or inaccuracies. Our approach involves detecting when the roll angle crosses these critical points and adjusting subsequent readings accordingly. This method ensures continuous tracking without abrupt changes, enhancing both accuracy and usability in real-world applications.


def adjust_roll_angle(previous_angle, current_angle):
    Adjusts current roll angle to prevent it from reading backwards 
    when crossing the -180/180 boundary.

        previous_angle (float): The last recorded roll angle.
        current_angle (float): The newly recorded roll angle.

        float: The adjusted current roll angle.

    # Threshold for detecting a wrap-around event
    threshold = 180

    # Calculate difference between consecutive readings
    delta_angle = current_angle - previous_angle

    # Detect wrap-around by checking if jump is larger than threshold 
    if delta_angle > threshold:
        adjusted_angle = current_angle - 360
    elif delta_angle < -threshold:
        adjusted_angle = current_angle + 360
        adjusted_angle = current_angle

    return adjusted_angle

# Copyright PHD


The adjust_roll_angle function efficiently manages consecutive roll angle readings from the BNO055 sensor:

  • Input Parameters: It takes two arguments; previous_roll and current_roll, enabling seamless adjustment based on historical and present values.
  • Detecting Wrap-Around Events: By analyzing the difference between angles, potential rollovers past boundary conditions are identified.
  • Adjustment Logic: If a significant change is detected beyond thresholds, corrective measures are applied to maintain data continuity without disruptions.

This logic ensures consistent tracking without errors caused by abrupt changes at critical points.

    1. How does one handle negative angles? Negative angles are handled similarly with adjustments ensuring smooth transitions across all quadrants.

    2. Can this method be applied to other types of sensors? Yes, similar principles apply universally across various sensor types reporting rotational metrics.

    3. What happens if my application requires more precision? Fine-tuning parameters or implementing filters can enhance precision tailored to specific needs.

    4. Is there potential for accumulating errors over time using this method? Minimal errors accumulate as each computation self-corrects based on real-time differentials.

    5. Can I use floating-point numbers for angles? Yes, floating-point arithmetic accommodates nuanced distinctions necessary for precise measurements.

  1. …and more insightful questions providing clarity on practical implementation aspects discussed here.


By incorporating intelligent logic for adjusting angular measurements at critical junctures defined by hardware limitations like those of BNO055 sensors, you elevate reliability across diverse application scenarios requiring consistent directional context without disruptive discontinuities often encountered otherwise.

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