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airbotix's blog
Posted by airbotix | Jun 21, 2012 @ 10:39 AM | 3,047 Views
A simple little demo

Precision Position Control of a Quadrotor (2 min 26 sec)


...........and below, with some wind

...Continue Reading
Posted by airbotix | Feb 26, 2012 @ 12:26 PM | 3,608 Views
Tiny GPS enabled quad flying a waypoint cube using high bandwidth position control.

120g quadrotor flying autonomous 2.5m cube (1 min 32 sec)

Posted by airbotix | Feb 25, 2012 @ 01:12 PM | 3,831 Views
Small lightweight Quad
- 5x3" props, 25cm diagonal motor-motor, only 180g AUW with 1.3Ah 2S
- >100g payload capability
- 21minutes endurance without payload
- High bandwidth 160Hz GPS hold and vario
- Maximum thrust ~500g
- Flight controller by Webb Consultancy Ltd (1.5x1.5", 14g with GPS antenna, bluetooth, etc....)
Perfect for all those spying missions............
Posted by airbotix | Jan 08, 2012 @ 08:20 AM | 3,987 Views
Rather than delete them, I thought I would put some old videos on YouTube.
This was the Version 1 controller in its final state (a Micro-Hexrotor PCB cobbled together thing).
They mainly show GPS & Vario assist for precision and proximity flying.

Footage from Shropshire (12 min 38 sec)


...Continue Reading
Posted by airbotix | Dec 28, 2011 @ 12:53 AM | 4,981 Views
Some flight controller testing to check out high bandwidth position hold (kinematic control) on this type of airframe. Entire flight in GPS closed loop.
Video shows
- position and altitude hold whilst yawing
- holding in turbulent wind
- holding in strong laminar wind whilst yawing
- return to home
- repeating 2.5 x 2.5 x 2.5m waypoint cube in strong laminar wind

Tri-rotor is is fairly old now but it got a new flight controller transplant
- 8x4" GWS props
- cheap motors
- cheap ESC's - Mystery Blue
- tail servo a bit slow
- Dual Spektrum SPM diversity modules
- video downlink
- 15 minutes endurance

Tri-rotor in wind (3 min 55 sec)

Posted by airbotix | Nov 22, 2011 @ 12:41 AM | 5,402 Views
A video of the new flight controller featuring high bandwidth 3D position control.

A general purpose controller for Multirotors.
Drives 6 x ESC's, 4 x servos
2 x Spektrum SPM9645 DSM2 diversity
Bluetooth for tuning, configuration and firmware updates
2A 5V BEC for servos
Calibrated and compensated
Factory assembled PCB's
Suitable for commercial ESC's (200-450Hz updates)

On-going software developments, but currently includes standard features like:
Vario, RTH, ground velocity control, rate or self levelling, auto-land safety, panorama and some waypoint based photography

Flexible tuning GUI for configuration with 3 memory banks

Quadrotor on a string (2 min 54 sec)

Posted by airbotix | Apr 16, 2010 @ 08:50 PM | 8,284 Views
Position control with 40Hz update rate (similar to "dynamic position hold")
- cyclic stick controls ground velocity
- central cyclic engages position hold

Vario height control
- collective stick controls climb rate
- central collective engages height hold

Auto-land at -1m/s, whilst holding position, with bump detect shutdown
- loss of radio
- battery low

New control algorithms (5 min 2 sec)