Yucong Lin
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  • Tempe, AZ
  • United States
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APM output problem

Started Nov 16, 2011 0 Replies

Hi all:(I post a similar one in arducopter user group.)I used my APM in an arducopter and found found one of my motors was always beeping ( the one connected to ch4 output. I did ESC and radio input…Continue

 

Yucong Lin's Page

Latest Activity

Cliff-E commented on Yucong Lin's blog post Fast moving obstacle avoidance for an Unmanned Aerial Vehicle: a simple case
"Is there any sort of camera calibration beforehand (can aid faster thresholding before binarization in some ways)?"
Apr 23, 2012
Colton commented on Yucong Lin's blog post Fast moving obstacle avoidance for an Unmanned Aerial Vehicle: a simple case
"Helldesk.  I'm assuming that  the image is realistically stable during the binarization shots.  If the UAV were moving you'd have to have a phase prior to the binarization phase in which you normalize the…"
Apr 22, 2012
Monroe Lee King Jr. commented on Yucong Lin's blog post Fast moving obstacle avoidance for an Unmanned Aerial Vehicle: a simple case
"whoa, wait a min! Now where talkin! I'm diggin this!"
Apr 22, 2012
Helldesk commented on Yucong Lin's blog post Fast moving obstacle avoidance for an Unmanned Aerial Vehicle: a simple case
"Nice! What is the threshold for an object to avoid? Having the whole image field move during a flight obviously isn't a problem, so how does it tell obstacles apart from the background?"
Apr 22, 2012
Yucong Lin posted a blog post

Fast moving obstacle avoidance for an Unmanned Aerial Vehicle: a simple case

http://youtu.be/ZOqQ0Qcgp0YIn this video, we demonstrate fast moving obstacle detection and avoidance for Unmanned Aerial Vehicles. Sensing and avoidingmoving objects is essential to autonomous flight. Our experimental setup consists of a quadrotor platform equipped with a forward facing monocular camera. The UAV platform was held manually in position to emulate a hover. In order to simulate high speed obstacleswe use a pitching machine which propels…See More
Apr 22, 2012
Yucong Lin replied to Randy's discussion ArduCopter 2.4 released
"Great job! By the way: can I know which version of MAVLINK does it use? Mavlink 0.9 or mavlink 1.0? Thank you"
Feb 23, 2012
Anish replied to Yucong Lin's discussion Asking for help: c code to read Arducopter's telemetry data. in the group ArduCopter User Group
"@yucong please try Peter Holland, btw he loves python ...."
Feb 21, 2012
Yucong Lin added a discussion to the group ArduCopter User Group
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Asking for help: c code to read Arducopter's telemetry data.

Hi Everyone:   I was writing a C code to read telemetry data from the arducopter. The below is my code.   It is receiving data from the arducopter, because the line "printf("%02x ", (unsigned char)temp);" does print some hex data and the data is the same to what I saw in GTKterm ( a tool to moniter serial communication)   but the data read cannot be decoded, since "mavlink_parse_char(MAVLINK_COMM_0, temp, &msg, &status)" always returns 0. which means the channel "MAVLINK_COMM_0" is not…See More
Feb 20, 2012
Yucong Lin added a discussion to the group ArduCopter User Group
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Is it possible to send desired (vx, vy, vz) to the arducopter and it can achieve them?

Hi everyone:    We know we can send WP command to the arducopter in real time. I wonder if I can send velocity command to it?   For example, we send the command "move to the right at 1m/s (vx=1m/s)" or "move forward at 0.5m/s (vy=0.5m/s)".  (Maybe we can send such commands via Mavlink)   Is it possible make the arducopter execute such commands? and how?   Thanks.See More
Jan 26, 2012
Michael Visser replied to Yucong Lin's discussion Xbee connection failure. in the group ArduCopter User Group
"Hi Johann, I've had firmware version on 1161 as well as 1061, in both cases the sender/receiver have matching firmware versions set to 57600 on the devices and 57600 within APM. I haven't tried the loopback test and am going to have a play…"
Dec 26, 2011
Johann Van Niekerk replied to Yucong Lin's discussion Xbee connection failure. in the group ArduCopter User Group
"Hi Guys Ill try and help . first thing first (sorry if im repeating the manual but lets get on the same page ) 1) is your firmware version 1061? 2) are you set to 57600? 3) is your APm planner software set to the correct comport and baud rate I.e…"
Dec 26, 2011
Michael Visser replied to Yucong Lin's discussion Xbee connection failure. in the group ArduCopter User Group
"I'm at this point too, would appreaciate any advice/things to try! :)"
Dec 26, 2011

100KM
u4eake replied to Yucong Lin's discussion question about waypoint planning in the group ArduCopter User Group
"If you add nothing after RTL, the copter will automatically go into loiter and stay loitering over home until you switch it to another mode. About the mission I can also say that this is also how I would do it, but I haven't flown enough…"
Dec 20, 2011

Developer
Randy replied to Yucong Lin's discussion sonar reading problem in the group ArduCopter User Group
"Steve,      So the 4.74v going into the sonar sounds a-ok.  Are you saying that the voltage coming out of pin3 of the sonar is constantly changing even when the distance to the nearest object does not change?  The…"
Dec 19, 2011
Steve Smetters replied to Yucong Lin's discussion sonar reading problem in the group ArduCopter User Group
"Randy, I am having a similar problem after upgrading to 2.1. My sonar is reading 685cm whereas it always read 33cm before. I checked the voltage and the sonar is receiving 4.74v. When I check the pin3 voltage the voltage wanders from .8 to 3.8v or…"
Dec 18, 2011
Yucong Lin added a discussion to the group ArduCopter User Group
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question about waypoint planning

Hi Everyone:    The mission I want to plan is like the followings:    once I switch Auto on,1. the arducopter will fly to the waypoint1 (33.420526,-111.9252348)2. the arducopter will loiter at WP1 for 5 secs3. after that the arducpter will fly to WP2 (3.4203918,-111.9255352)4. once it reaches WP2, it will return to launch position.attached is the screenshot of my mission planner …See More
Dec 16, 2011

Profile Information

About Me:
I am a graduate student in ASU and I will start my research on UAV. We are going to build a quadrotor testbed based on arducopter.
Please tell us a bit about your UAV interest
outdoor navigation
Hometown:
Wuhan CHina

Yucong Lin's Blog

Fast moving obstacle avoidance for an Unmanned Aerial Vehicle: a simple case

Posted on April 22, 2012 at 3:30pm 3 Comments

http://youtu.be/ZOqQ0Qcgp0Y

In this video, we demonstrate fast moving obstacle detection and avoidance for Unmanned Aerial Vehicles. Sensing and avoidingmoving objects is essential to autonomous flight.

 

Our experimental setup consists of a quadrotor platform equipped with a forward facing monocular…

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