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Thread: Arduino & Stabilized Platform - Off topic?

  1. #1
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    Lightbulb Arduino & Stabilized Platform - Off topic?

    I am working on an ATmega328 with accereometrs and Gyro's to stabilize a PT platform and heres what I need. I have been unable to get better help on Arduino.cc or anywhere else. Consider that I have a pan/Tilt (2 servos) controlling a SONY block camera. I need the auctual platform on which it sits to be stabilized in 2-3 axis. The camera also has a laser on it for pointing (green)

    I have modified this to work with a Wii MP & Nunchuck to move the PT unit in lieu of the joystick, but I need to have the joystick as the main HMI and IMU to stabilize.

    I have atleast 6 different gyros and a number of Accell's. I also just bought 2 Pololu MinIMU-9 Gyro, Accelerometer, and Compass (L3G4200D and LSM303DLM Carriers ) (http://www.pololu.com/catalog/product/1265)

    Any ideas?

    Once again, sorry if this is too off topic. I'm not to well versed in C++ yet
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  2. #2
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    Maybe it's just too early in the morning, but I can't tell what exactly the question is. You basically need to perform some type of sensor fusion with all the inputs you have coming in. Looks like the sensors are I2C, so it shouldn't be too difficult to acquire all the data needed, and then offload to a PC for a processing (or do on the Arduino, I guess).

    Or if you're talking about joystick input, probably using a USB joystick with DirectInput/XInput and then connecting the Arduino to the PC as a USB device (might have to go to a higher-end model with USB functionality, I'm not that familiar with the Atmel lineup). Might find it easier to use C# and base your code off some of the DirectX SDK samples.

  3. #3
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    The joystick is a standard DUAL pot. not hall effect (which would be better) I have the Pan/Tilt working fine with the joystick. Now I just need to compensate for movement with IMU. I need it to just subtract or add to the numbers that move the pan/tilt when the joystick is either moving or not. Guess Ill mount the IMU on top of the Block camera. Im not using slip rings because I do not need 360 degree rotation. The arduino Atmel 328 should be fine to crunch the numbers ok
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  4. #4
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    He wants to have the IMU lock onto a heading and tilt, holding till input from the remote. correct?

  5. #5
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    Yes...That is what I'm looking for.
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  6. #6
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    geo pointing is the term. have not seen anyone do it on an arduino. I cant be much help in the code department sorry. This reminds me, I have 20 pan/tilt units here from satellite trackers I should off soon.

    http://procerusuav.com/cameraControl.php
    http://www.flir.com/mcs/products/adv...inting-Module/
    Last edited by Picasso; 01-30-2012 at 09:22. Reason: links

  7. #7
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    I'm seeing R/C Helicopter Gyros for Servo control in my mind...
    Not sure if that would help in your case...


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  8. #8
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    I have all the required hardware, multiple gyros, accelerometers, Wii controllers, pan/tilts already built. The aircraft gyros are not stable enough and R/C stuff has the wrong inputs.
    405nm (500-750mW) , 445nm 500 to 2750mW) , 473nm DPSS, 532nm DPSS (80 to 3000mW) & 635nm (250mW) OEM Lasers
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  9. #9
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    I would achieve this with PID loops The joystick determines the setpoint, the gyro the positional feedback.
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  10. #10
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    maybe a 2 axis acellerometer would work better
    405nm (500-750mW) , 445nm 500 to 2750mW) , 473nm DPSS, 532nm DPSS (80 to 3000mW) & 635nm (250mW) OEM Lasers
    Visiblediodelasers.com

    10% Off Website lasers for PL members - PM or E-mail me.


    CW, TTL & Analog Modulation available
    Custom / Turnkey OEM systems available
    Laser Diode Power Supplies (CW & Modulated) to 4 Amps
    Beam-shaping optics available (Prism Pairs)
    NEW - Laser Diode / Heat sink Mounts

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