Aizzat
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Aizzat's Discussions

Compass Sensor Reading Not From 0-360 degree

Started this discussion. Last reply by Chaung Wade Jan 28, 2013. 4 Replies

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

Tags: direction, degree, heading, compass

GPS Reading Inaccuracy Problem

Started this discussion. Last reply by Tersus GNSS Dec 11, 2015. 18 Replies

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

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

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

Tags: Arduino, Problem, APM2.0, XBEE

 

Aizzat's Page

Latest Activity

Tersus GNSS replied to Aizzat's discussion GPS Reading Inaccuracy Problem
"single point GPS is not suitable for this task,  you need differential GPS (SBAS, WAAS.) to get accuracy of 1m. then if you want the centimeter accuracy, you need RTK GPS. checkout our website: tersus-gnss.com; we are targeting low cost RTK for…"
Dec 11, 2015
Ryan Jarvis replied to Aizzat's discussion GPS Reading Inaccuracy Problem
"Hello, Would a differential gps option be possible using the gps on an android device, or external gps on a laptop (used as a base station with radio telemetry).  Here are the changes that would probably be needed in mission planner: The…"
Nov 25, 2015
Chaung Wade replied to Aizzat's discussion Compass Sensor Reading Not From 0-360 degree
"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,…"
Jan 28, 2013
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…"
Aug 13, 2012
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…"
Aug 13, 2012
Aizzat commented on Patrick Mccabe's photo
Thumbnail

My AGV

"Same with mine... "
Jul 22, 2012
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…"
Jul 19, 2012
Aizzat replied to Aizzat's discussion Compass Sensor Reading Not From 0-360 degree
"Any library that i could use to calibrate it?"
Jul 19, 2012
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…"
Jul 19, 2012
Aizzat posted a discussion

Compass 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
Jul 19, 2012
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…"
Jul 16, 2012
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. "
Jul 15, 2012
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…"
Jul 15, 2012
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."
Jul 15, 2012
Barrett Ames replied to Aizzat's discussion GPS Reading Inaccuracy Problem
"have you considered a PID control loop? "
Jul 14, 2012
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…"
Jul 12, 2012

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About Me:
Researcher
Please tell us a bit about your UAV interest
Autonomous Control
Hometown:
Malaysia

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