"Hello Aizzat, Can I ask you do you have modified compass_test.pde library? I use the compass_test.pde, then my compass result signal is from 0-65535(never have negative signal). It's look like the signal come from ADC directly,…"
Aizzat's Discussions
Compass Sensor Reading Not From 0-360 degree
Started this discussion. Last reply by Chaung Wade Jan 28. 4 Replies 0 Likes
I am using compass sensor in APM2 to measure the relative bearing to the waypoint. FYI, I am using compass_test.pde library to measure the angle of the compass. However, the reading is not from 0-360…Continue
GPS Reading Inaccuracy Problem
Started this discussion. Last reply by Barrett Ames Jul 16, 2012. 16 Replies 0 Likes
I have APM2. I tried to verify the location of my GPS.What I found out is that at the same location GPS reading gives different value even though I am not moving my APM, it is just a static…Continue
Tags: Location, inaccurate, GPS, APM2.0
Anyone knows how to measure the lateral crosstrack error ?
Started this discussion. Last reply by Aizzat Jun 25, 2012. 7 Replies 0 Likes
I read navigation.cpp from AP_Navigation library. I need to measure crosstrack of ArduRover measuring the current location (from GPS) with the desired point or path. Inside the code there is a…Continue
Tags: AP_Navigation, tracking, crosstrack
XBEE Problem with APM2.0
Started this discussion. Last reply by Jeffrey Knickelbein Aug 13, 2012. 6 Replies 0 Likes
Hi, I am facing problem to communicate XBEE with APM2.0. I did several tests before:1. Configure both XBEE (the one at PC and the one at APM2.0) using X-CTU. And it works, both XBEE can communicate…Continue
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Jeffrey Knickelbein replied to Aizzat's discussion XBEE Problem with APM2.0"I found that I had a damaged pad on the RX side when I tried hard wiring the solder pads for selecting the UART on the under side of the board. I am now using the 2.4GHz XBee Series 2 and I disable the CTS modem control line on the aircraft side. I…"
Mark Barbee replied to Aizzat's discussion XBEE Problem with APM2.0"Recently I have had similar problems. Arducopter v2.7.1 / APM2 / Mission Planner 1.2.5They occurred when I was trying to implement my OSD and wireless telemetry. All components are 3DR - 900mhz radio, MinimOSD 1.1 with MinimOSD_19_MAV10. The…"
Aizzat replied to Aizzat's discussion Compass Sensor Reading Not From 0-360 degree"My problem solved! What I do is just simply change the orientation of the compass sensor depending on how I place it on my rover. In arduino library, you can simply change it here:
Simply change compass.set_orientation parameter…"
Aizzat replied to Aizzat's discussion Compass Sensor Reading Not From 0-360 degree"Any library that i could use to calibrate it?"
Bot Thoughts replied to Aizzat's discussion Compass Sensor Reading Not From 0-360 degree"That's precisely what happens when the magnetometer isn't calibrated.
Hard iron distortion creates an offset (bias, if you prefer) in the readings of each axis. The algorithm that computes compass direction expects there to be 0 bias. The…"
Aizzat posted a discussionCompass Sensor Reading Not From 0-360 degree
I am using compass sensor in APM2 to measure the relative bearing to the waypoint. FYI, I am using compass_test.pde library to measure the angle of the compass. However, the reading is not from 0-360 degree as what I expected when I rotate my rover. It goes something like this; 20 - 80 degree, the value goes down when I turn over 270 degree.... In summary, it does not give the value similar from what I get if I am using compass sensor from my smartphone. Any idea why this is happening?See More
Barrett Ames replied to Aizzat's discussion GPS Reading Inaccuracy Problem"I used heading for my PID. So I calculated the heading i wanted to be going, and the heading that i actually was going. However I suppose you could use cross track error. It would be good for you to find a good tutorial on PID, because they are very…"
Aizzat replied to Aizzat's discussion GPS Reading Inaccuracy Problem"Hi Barret,
Do you have any rough idea how do you control it using PID? What is the steady state error are you trying to achieve ? From what you said, seems like PID could solve my problem. I would like to try it if this is possible. "
Barrett Ames replied to Aizzat's discussion GPS Reading Inaccuracy Problem"I don't know about the AGPS function. In the past i've sucessfully used PID to remove jerky motion in navigation on a very similar project. Increasing the accuracy of the GPS won't make it less jerky, in fact it might make it…"
Aizzat replied to Aizzat's discussion GPS Reading Inaccuracy Problem"Hi Barret,
I am not sure if PID is good enough to be able to generate steering controller with no jerk due to accuracy problem."
Barrett Ames replied to Aizzat's discussion GPS Reading Inaccuracy Problem"have you considered a PID control loop? "
Aizzat replied to Aizzat's discussion GPS Reading Inaccuracy Problem"I already verified that, you were right. The accuracy that I get is down. But not until < 3 meter. Maybe around 3-6 meters.
What I am planning to do is to make my rover moving in curve point by measuring the crosstrack error so that is will…"
Aizzat replied to Aizzat's discussion XBEE Problem with APM2.0"From what I read, XBEE cannot be connected to the PC with USB attached. It was causing conflict. What I did to read the XBEE reading is to use serial port 2 which is different port from USB port.
It is capable of reading XBEE data. For my…"
Barrett Ames replied to Aizzat's discussion GPS Reading Inaccuracy Problem"If you get your waypoint coordinates from Google Earth you should be able to get an accuracy down to -+3 meters. I'd try that, and if that doesn't meet your needs then i'd think about doing DGPS. I've run a rover with 3 meter…"
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