[HWT905] MPU9250 9-axis Gyro+Angle(XY 0.05°,Z axis 1° Accuracy)+Digital Compass with TC, IP67

TTL Serial, RS-232, RS-485, and CAN are different serial communication standards. TTL Serial is ideal for direct microcontroller connections, featuring full-duplex transmission, a short Transmission Range of under 1 meter, and requires a common ground. RS-232 is typically used in industrial environments, also full-duplex, supports up to 10 meters, and requires a common ground. RS-485 and CAN both use differential signals, which provide excellent anti-interference and do not require a common ground for short distances. Both are half-duplex. However, RS-485 supports up to 100 meters and is great for long-distance industrial networking, while CAN supports up to 200 meters and is designed for reliable networking in automotive and complex industrial applications, though it comes with a slightly higher cost.

The Absolute Angle is a fixed angle and cannot be reset to zero. The Relative Angle is calculated through integration and can be reset to zero. The Z-axis Angle of a 6-DOF sensor is derived from the integration of Acceleration and Angular Velocity, which produces accumulated error. The Z-axis Angle of a 9-DOF sensor is calculated using the Magnetic field, which has no accumulated error, but it is susceptible to magnetic interference when near ferromagnetic objects.

Currently, it refers to the "Static Zero Drift" or "Bias Stability" parameter in the datasheet. The static zero drift of a sensor refers to the phenomenon where the reference value (zero point) of the output signal changes when the sensor is not subjected to any external force or interference. This change may be caused by aging of internal components, mechanical deformation, temperature changes, etc. Static zero drift can cause errors in the sensor output signal and affect the Accuracy of measurement results. To ensure the measurement accuracy of the sensor, Calibration and adjustments are generally required.