UM7 Orientation Sensor

UM7 Orientation Sensor

The UM7 is a 3rd-generation Attitude and Heading Reference System (AHRS) that takes advantage of state-of-the-art MEMS technology to improve performance and reduce costs. Like its predecessors, the UM7 combines triaxial accelerometer, rate gyro, and magnetometer data using a sophisticated Extended Kalman Filter to produce attitude and heading estimates.

Price each:

$0.00

How To Buy

The UM7 is now being manufactured by our partners at Redshift Labs, and can be purchased directly from Redshift or from Pololu.

Overview

The UM7 is a 3rd-generation Attitude and Heading Reference System (AHRS) that takes advantage of state-of-the-art MEMS technology to improve performance and reduce costs. Like its predecessors, the UM7 combines triaxial accelerometer, rate gyro, and magnetometer data using a sophisticated Extended Kalman Filter to produce attitude and heading estimates.

The UM7 also adds many new features, including higher gyro bias stability and lower noise, a new communication architecture for improved flexibility, optional NMEA packet transmission, UTC time-synchronization with external GPS, and support for third-order temperature compensation on all sensors.

Even with its added features, the UM7 is offered at a significantly reduced priced compared to other sensors in its class.

The UM7 comes with one 5-pin cable assembly for the main IO header. Extra 5-pin cable assemblies and 6-pin assemblies for the optional IO expansion headers are also available.

A USB Expansion Board is available to make it easy to connect the UM7 to your computer. You can then use the CHR Serial Interface (available in the “Resources” tab) to configure the sensor, and view and log data in real-time.

High performance

  • Excellent gyro bias stability over temperature
  • Adjustable low-pass filter and EKF settings provide customizable performance for various applications.
  • States and sensor data synchronized to GPS position and velocity using optional external GPS module.
  • Supports alignment calibration and third-order bias and scale factor temperature compensation for accels, gyros, and magnetometer (optionally performed in-factory or by the end-user).
  • Magnetometer soft and hard-iron calibration

Lower Cost

  • State-of-the-art MEMS devices designed for mass-market consumer applications drastically lowers cost
  • OEM version reduces overall cost, size, and weight

Ease of use

  • Transmits data using human-readable NMEA strings, binary packets for higher efficiency, or a combination of both
  • Flexible communication architecture allows UM7 to transmit any combination of data at individually adjustable rates
  • Connects to the CHR Serial Interface software to allow for real-time plotting of sensor data, logging, device configuration, and magnetometer calibration

Attitude and Heading Specifications

  • EKF estimation rate: 500 Hz
  • +/- 2 degree typical static pitch/roll accuracy
  • +/- 4 degree typical dynamic pitch/roll accuracy
  • +/- 5 degree typical static yaw accuracy
  • +/- 8 degree typical dynamic yaw accuracy
  • 0.5 degree angle repeatability
  • 0.01 degree angular resolution

Other Specifications

  • Input voltage: 5.0V
  • Communication: 3.3V TTL UART, SPI bus
  • Supported baud rates: 9600, 14400, 19200, 38400, 57600, 115200, 128000, 153600, 230400, 256000, 460800, 921600
  • Power consumption: 50mA at 5.0V
  • Operating temperature: -40 to +85 C
  • Dimensions: 1.06″ x 1.02″ x 0.26″ (27mm x 26mm x 6.5mm)
  • Weight: 0.4 oz. (11 grams)
  • Data outputs rates: 1 Hz to 255 Hz (binary packets), 1 Hz to 100 Hz (NMEA packets)
  • Output data: Attitude and heading (Euler Angles), Attitude quaternion, GPS altitude, position, velocity (w/ external GPS), magnetometer, accelerometer, gyro data

Documents

Software Downloads

Example Code

Getting started: Connecting the UM7 to your computer.
(Watch on YouTube for hi-def version)
Getting started: Changing Communication Settings.
Getting started: Calibrating the magnetometer.
  • Views:

    • UM7-LT Orientation Sensor

      The UM7-LT is equivalent to the UM7, except that it does not include an enclosure and factory calibration is not available. The UM7 is a 3rd-generation Attitude and Heading Reference System (AHRS) that takes advantage of state-of-the-art MEMS technology to improve performance and reduce costs. Like its predecessors, the UM7 combines triaxial accelerometer, rate gyro, and magnetometer data using a sophisticated Extended Kalman Filter to produce attitude and heading estimates.

    • UM7 Cable Assembly

      Extra cable assemblies for the UM7. The UM7 comes with one 5-pin cable assembly for the main IO header. Additional cables are not needed unless you want extras, or you want to use the 6-pin IO expansion headers.

    • UM6 4-pin Cable Assembly

      Extra 4-pin data cable for interfacing with the UM6 through its side connector

    • GP9: GPS-Aided AHRS

      The GP9 has been discontinued and is no longer available for purchase. The GP9 is a GPS-aided AHRS that measures orientation, velocity, and position at 500 Hz. The GP9 combines temperature-compensated rate gyros, accelerometers, magnetometers, and absolute air pressure with GPS to produce angle estimates that are reliable even during aggressive dynamic maneuvers. Unlike more simple attitude sensors, the GP9 is capable of measuring its yaw angle without relying on unpredictable magnetic field measurements.

    • Hydra: Smart DC Power Supply

      DISCONTINUED. The Hydra has been discontinued and is no longer available for purchase.