Inertial Measurement Unit

Emtron ED Series Displays contain 6 axis Inertial Measurement Unit (IMU).

Output Channels

  • G-Force Lateral
  • G-Force Longitude
  • G-Force Vertical
  • Acceleration Lateral
  • Acceleration Longitude
  • Acceleration Vertical
  • Angular Velocity X
  • Angular Velocity Y
  • Angular Velocity Z
  • Roll
  • Pitch
  • Yaw

Calibration

IMU Config IMU Config

  1. Make sure car is parked on a flat level surface.
  2. Click Zero Calibrate to put the IMU into calibration mode. The device will take 5 seconds worth of samples and find it’s vertical orientation. The calibration is stored in permanent memory in the device.
  3. Once completed, G-Force Vertical should read close to 1.0G, while G-Force Lateral and G-Force Longitude should be 0.0G.
  4. Drive the car forward and stop. G-Force Longitude should go positive when accelerating and negative when braking. G-Force Lateral should remain near zero.
  5. If required, adjust the Yaw Orientation value until the Longitudinal and Lateral G-Forces are aligned correctly.

In Field Calibration: Conditional Logic can be used to generate the IMU Calibration Begin event. This allows the IMU to be calibrated from a keypad button or similar user input.

Filtering

Accelerometer Filter and Gyro Filter values control how filtered the IMU measurements are.Values are a percentage (0 - 99.9%). Higher filtering gives a cleaner signal, but slows down the signals rate of change. Use the least filtering you can get away with. Typical values would be 10-40 %