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Andrus Kangro replied to Paul Mather's discussion HappyKillmore's Ground Control Station
"Hi, I'm very interested in generic Mavlink support by Happykillmore GCS. It is there by a large extent, but some commands do not match, like uav modes.
For example, mavlink protocol has 4 testing modes for MAV_MODE and I'm using 2 of them in order t…"
May 30, 2011
Andrus Kangro commented on Paul Mather's blog post HK's GCS now compatible with APM MAVlink
"Hi Happykillmore, you are doing amazing job with your GCS, its such a nice software.
Let me point out one issue you might not be aware of. You wrote:
@Krzysztof, I will investigate today. There is currently an issue with ArduPilot Mega and UTC t…"
Mar 24, 2011
Andrus Kangro replied to Tonino's discussion HobbyKing?
"Hi, I've made 24 orders from Hobbyking so far and will order more.
I've had one issue - one order which I originally selected to be paid with Visa, I paid with Paypal, and this order did not go into "Processing" status automatically. I sent e-mail t…"
Sep 11, 2010
Andrus Kangro commented on Andrus Kangro's blog post My autopilot
"I played with airspeed gain, but did not get it right in a way I liked it. I had best results when I adjusted gain (but not controller period) on the fly - when oscillation detection kicked in, then lowered it and when not enough control authority w…"
Mar 10, 2010
Andrus Kangro commented on Andrus Kangro's blog post My autopilot

the code was standard PID controller (controller period was 200ms, as servos could not react with shorter period) with Ziegler–Nichols autotuning. Since I moved to Cosinus Matrix Transform, I do not use it any more.
It worked just and just OK -…"
Mar 10, 2010
Andrus Kangro replied to Joe Nix's discussion Cheap 6+ Axis Acc/Rate w/I2 interface, < $60 WII Nunchuck and MotionPlus
"Hi, motionplus is in fact 3-axis gyroscope (it has two-axis IDG600 + single-axis XV-3500 gyro chips inside). Here has been a lot of discussion about it some time ago.
However, getting just gyro chips from Sparkfun with comparable quality costs also…"
Nov 25, 2009
Andrus Kangro replied to mo fakahany's discussion Self-retrieving High Altitude Experimental Glider
"Hi, I think that this similar project you referenced provides quite a lot of valuable information. I would assume that main concern is cold (below -40 degrees/celsius) and very high winds up there, so you may want to look into airframe design that f…"
Nov 19, 2009
Andrus Kangro commented on automatik's blog post Razor 6DOF IMU + Arduino + DCM
"Hi, if you integrate gyro output, does it smooth out? Maybe just increasing low-pass capacitor will help?"
Nov 15, 2009
Andrus Kangro replied to Curt Filipowski's discussion Cold Weather UAV Sensors
"Hi, I think that most problematic sensor to maintain in working order in rain and cold is airspeed sensor, i.e. pitot tube. It needs to be in airflow and is therefore open to rain and potentially freezing temperatures. Full scale aircraft has heated…"
Nov 15, 2009
Andrus Kangro replied to ZORO's discussion Cancel Acceleration due to motion??????????
"Hi, this is fundamental issue with IMU's. In short, you need to use gyros + accelerometer for this task and may also use magnetometer. You may want to consult direction cosine matrix documents found here, as this is one of the possible solutions tha…"
Nov 14, 2009
Andrus Kangro commented on automatik's blog post Razor 6DOF IMU + Arduino + DCM
"Hi Doug, what you wrote in arduimu thread is exactly the issue I've been trying to describe here, same problem. It would be interesting to know, how Arduimu programmers solved it. As far as I can tell, no Razor or Arduimu v2 should be capable of gui…"
Nov 12, 2009
Andrus Kangro replied to Michel Blanc's discussion GS407 : 10+ satellites in view but no fix
"Hi, surprisingly, I have same issue. I got my GS407 yesterday from Sparkfun and its hanging outside currently under (cloudy) open sky and cannot get fix. It does see satellites and was able to get date/time (I use it with u-center). EM-411 on same c…"
Nov 11, 2009
Andrus Kangro replied to Faisal Shah's discussion How many switches/pushbuttons/LEDs to use, and for what
"Hi, I would think of 3 leds:
1. green: board has power
2. yellow: non-critical error (you can fly the plane manually, but autopilot won't work - can be sensor issues, also gps.)
3. red: critical error, unsafe to fly plane (at least one RX input is m…"
Nov 10, 2009
Andrus Kangro replied to Faisal Shah's discussion Interfacing 5V sensor with 3.3V uC
"Hi, MPXV5004DP zero pressure voltage is close to zero, so you can use it as is, assuming that you are not reaching speeds where sensor output voltage exceeds 3.3V. MPX4115 voltage, however, is close to VCC (5V), so I use resistor bridge to bring it…"
Nov 10, 2009
Andrus Kangro replied to Wayne Dancer's discussion What Would You Pay For An Airframe?
"Hi, if you compare yor offering with that, then what are advantages?
I would be a bit affraid of aluminium on DIY context, foam/balsa sounds a lot safer."
Nov 9, 2009
Andrus Kangro commented on automatik's blog post Razor 6DOF IMU + Arduino + DCM
"Hi, very interesting plots. Natural question arises, why amplified outputs are not on exactly on vref's. As you mentioned, you may have been affecting them with measurements, as resistor to vref from output is one megabyte and ADC input impendance c…"
Nov 8, 2009