Search found 6 matches

by Jason_L
Tue Aug 13, 2019 11:56 pm
Forum: FAQ
Topic: How to use IMU and ultrasonic for precise navigation
Replies: 5
Views: 2303

Re: How to use IMU and ultrasonic for precise navigation

Hello, Yes, you can modify the Python example for parsing address of the beacon as you have shown. Current version of our example doesn't include this. I thing the parsing string should be: x, y, z, qw, qx, qy, qz, vx, vy, vz, ax, ay, az, HedgeAdr, timestamp, usnCRC16 = struct.unpack_from ('<lllhhh...
by Jason_L
Tue Aug 13, 2019 11:44 pm
Forum: FAQ
Topic: Raw distance measurement from hedgehog
Replies: 2
Views: 1549

Re: Raw distance measurement from hedgehog

Hi

Do you enable the Raw distance output which under the interface option in the right side of dashboard?
by Jason_L
Fri Aug 09, 2019 9:38 am
Forum: FAQ
Topic: How to use IMU and ultrasonic for precise navigation
Replies: 5
Views: 2303

Re: How to use IMU and ultrasonic for precise navigation

Hello, To use IMU fusion you need to: 1. Enable IMU in 'IMU' settings section for hedgehog in dashboard 2. Execute accelerometer calibration as shown in section 10.9 of the manual: https://marvelmind.com/pics/marvelmind_navigation_system_manual.pdf 3. Enable output of IMU fusion data - "Proces...
by Jason_L
Fri Aug 09, 2019 9:06 am
Forum: FAQ
Topic: Calculation of Hedge Axis Rotation by Quaternion _Starter Set HW v4.9-IMU
Replies: 4
Views: 1603

Re: Calculation of Hedge Axis Rotation by Quaternion _Starter Set HW v4.9-IMU

Hello, 1. Yes, every time after reset hedgehog starts angle around Z from zero, because it can't know real angle from some source. So quaternion gives orientation relative to some startup state. 2. Slow change of angle around Z axis is caused by gyroscope drift. This drift can be compensated by 'Ze...
by Jason_L
Wed Jul 24, 2019 1:00 pm
Forum: FAQ
Topic: Calculation of Hedge Axis Rotation by Quaternion _Starter Set HW v4.9-IMU
Replies: 4
Views: 1603

Re: Calculation of Hedge Axis Rotation by Quaternion _Starter Set HW v4.9-IMU

Update: I set up the beacons in a bigger room (6m * 6m), all 4 beacons are put on corner of walls and above mobile hedge about 2.5m. In suspicion of hedge broken, I also try on another mobile hedge, put it on table, no touch. Everything looks very good except the rotation angle around Z axis keeps i...
by Jason_L
Mon Jul 22, 2019 10:46 am
Forum: FAQ
Topic: Calculation of Hedge Axis Rotation by Quaternion _Starter Set HW v4.9-IMU
Replies: 4
Views: 1603

Calculation of Hedge Axis Rotation by Quaternion _Starter Set HW v4.9-IMU

Hi everyone: I am doing a project tracking a moving person's location and orientation to several points fixed in reference frame by a Hedge. Code is conducted under Python 3.5/3.7. So I build a map by 4 static Beacons for the reference frame, and using the quaternion through IMU data to compute the ...

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