Description
The UM7-LT orientation sensor from Redshift Labs is an Attitude and Heading Reference System (AHRS) consisting of a three-axis accelerometer, rate gyro and magnetometer.
Unlike a typical inertial measurement unit (IMU), which only provides raw sensor readings, the UM7 includes an onboard microcontroller that fuses sensor data using a sophisticated Extended Kalman Filter (EKF) and determines attitude and position 500 times per second.
The UM7 offers a number of improvements over its predecessor (UM6). These include higher gyro bias stability and lower noise, a new communication architecture for improved flexibility, optional NMEA packet output, UTC time synchronization with external GPS and support for sensor temperature compensation.
Power and serial TTL communication are connected via a polarized five-pin connector on one side and the included cable. A pair of six-pin expansion headers on the other side of the board provides additional connection options, including an alternative SPI interface and a secondary serial interface that can be connected to an external GPS module (e.g. an LS20031 GPS receiver).
The unit is supplied with an enclosure. Here is the UM7-LT orientation sensor without enclosure.
Features:
Sensors and processing
- Excellent gyro bias stability
- Adjustable low-pass filter and EKF settings provide customizable performance for different applications
- External GPS modules can be used
- Temperature compensation for sensors
- Magnetometer calibration can be performed with the CHR Serial Interface software
Communication
- Output data
- Attitude and heading (Euler angles)
- Attitude quaternion
- Magnetometer, accelerometer, gyro data
- GPS altitude, position, velocity (optional with external GPS)
- 3.3 V TTL serial interface (UART) with baud rates up to 921,600 bps, which can provide a data stream or updates on request
- The main UART pins, TX and RX, are 5V-tolerant
- Transmits data as human-readable NMEA strings (up to 100 Hz), binary packets (up to 255 Hz) or a combination of both
- Flexible communication architecture allows the UM7 to transmit any combination of data at individually adjustable rates
- CHR Serial Interface software enables real-time plotting of sensor data, logging, device configuration and magnetometer calibration
- SPI interface via expansion connector
Specifications:
- Dimensions: 27 mm × 26 mm × 6.5 mm
- Weight: 3.5 g (without cable)
- Operating voltage: 4 V to 5.5 V
- I/O logic level: 3.3 V (with 5V-tolerant UART pins, TX and RX)
Attitude and heading:
- EKF estimation rate: 500 Hz
- ±1° typical static pitch / roll accuracy
- ±3° typical dynamic pitch / roll accuracy
- ±3° typical static yaw accuracy
- ±5° typical dynamic yaw accuracy
- 0.5° angular repeatability
- 0.01° angular resolution
Documents:
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This depends on where you are located. Once the order has been handed over to UPS, the delivery time in Germany is approx. 2-3 days, within Europe approx. 1 week.
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