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Corvus Corax

Member Since 18 Jun 2010
Offline Last Active Today, 10:49 AM

Posts I've Made

In Topic: Extended Kalman Filter

Today, 10:47 AM

sorry I don't think we have many people here who know there ways around EKF design. Theres kenz, and Dschin and maybe peabody124 and that's more or less it.well TimJ obviously :)

In Topic: Magnets + CopterControl = Disaster?

16 May 2012 - 01:15 PM

Putting static magnets on CopterControl is no issue at all IMHO.

Putting static magnets on Revo can be, because you need to recalibrate the magnetometer sensor when the magnetic near field changes. It can still work despite strong magnets (provided the magnetic field is not out of scale of the sensor), but you would have to do magnetometer calibration while the Revo is attached to all magnets in the same way it will be during flight, and a small change to the magnets means you'd have to recalibrate.


Whats a "no no" is a magnetic field that changes during flight.
This will happen if you have big power cables with varying current load near the Revo board (aka the cables from battery to ESC or from ESC to motor(s)) or motors and Revo close by.

You can lessen the impact of power cables by twisting the red and black one with each other, since their magnetic fields under load will even each other out.

But if in doubt, use velcro. Unlike magnets it even dampens vibrations.

In Topic: Salvaging a MacBook (tm) battery for LiPo cells

14 May 2012 - 03:09 PM

yeah I assume this pack really can't take high power really well. It's made for long lasting "low" current (500mA-1A ish)use in a laptop, not a quad, so it won't be able to supply engines. It might be great on a glider though :)

In Topic: Puffy LIPO question

12 May 2012 - 05:23 PM

"3.94, 4.19 and 4.12" - that is not balanced IMHO.

"2.98, 2.99 and 2.95" - that is ""balanced"", but extremely low. Many chargers won't even start charging if the open circuit voltage is below 3.00V per cell. Normal Lipo-savers in ESC's cut throttle at 3.0V per cell under load. But if you disconnect such an empty battery and let it sit it usually gets back up to at least 3.5V. That means your pack is so empty, its almost beyond rescue. And its bloated. Not good.

If you have a fire-safe area, like a big concrete driveway in front of the house, put your charger there, and then try charge that puffed battery at minimum current (at most 100 mA) until you get to a cell voltage for storage - of about 3.1 - 3.3V. Then stop charging and store it somewhere safe (fireproof) until the puffing goes away. (If it ever goes away). But even then I wouldn't use that pack on anything really power hungry (like a quad). It liklely just wouldn't survive the current load.

In Topic: Salvaging a MacBook (tm) battery for LiPo cells

12 May 2012 - 04:26 PM

The 3S pack I built from it weights 165 gram including the wires.

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