B A Kanchuka
  • Male
  • Ja Ela
  • Sri Lanka
Share
  • Blog Posts
  • Discussions (1)
  • Groups
  • Photos
  • Photo Albums
  • Videos

B A Kanchuka's Friends

  • d j
  • Charles Linquist
 

B A Kanchuka's Page

Latest Activity

d j left a comment for B A Kanchuka
"I try to avoid ultrasonic sensors since they have been in use in cars for years but never replaced car radar, lidar radar implemented  today into autonomous cars. Your "I'm using a Raspberry pi 4, although a RPI 3B+ or RPI3A+ will…"
yesterday
Charles Linquist left a comment for B A Kanchuka
"OK, I'll give you a few details. I'm using a Raspberry pi 4, although a RPI 3B+ or RPI3A+ will work also. I also use a Raspberry pi camera. Mounted on top is a SixFab Raspberry Pi 3G/4G "hat" with a Quectel EC-25X modem. Here,…"
Friday
B A Kanchuka left a comment for d j
"Yes. The Lidar systems wont work efficiently/ accurately on direct sunlight although it has a  360 degree scanning capability. I guess the we could construct a 4 way obstacle avoidance system using ultrasonic sensors and they sense upto 4…"
Friday
B A Kanchuka left a comment for Charles Linquist
"Hi,    I want to know the steps and the process to connect the Pixhawk to the internet (Through a RPI onboard computer connected to the Pixhawk through a server like you successfully did by 4G/3G) and on how to connect multiple Vehicles to…"
Friday
d j left a comment for B A Kanchuka
"@Charles Linquist I would like to buy your Radar collision avoidance, obstacle avoidance, object avoidance system, either directly or via Ainstein. Unfortunately none marketed yet. I have tested a number of forward looking lidar based radars but…"
Thursday
Charles Linquist left a comment for B A Kanchuka
"What do you want to know?  I won't give you 100% of the details, because I'm preparing a 4G telemetry/control + video product for sale. I also am finalizing an Object Avoidance system using radar. It works with any Mavlink-Compatible…"
Thursday
B A Kanchuka replied to Charles Linquist's discussion Telemetry and HD video over 4G
"Hi,  I'm building a fleet of Arduboats (say 15 Nos) running latest Arduboat firmware on Pixhawk FC.  The problem is to connect all those 15 pixhawk boats to a single ground station through an internet connection. I suggest that your…"
Thursday

Profile Information

About Me:
Name by B A Kanchuka and I'm from Sri Lanka
Contact: +94 077 841 2740 (whatsapp) / +94 071 766 1324
Facebook: Kanchuka Sandaruwan

I'm a free time autopilot systems designer

My profession is a Financial Analyst though working at UTE srilanka CATERPILLAR (www.ute.lk)

Professional Qualifications:
CMA (Institute of Certified Management Accountants of Sri Lanka)
IDM VTEC - Diploma in Computer Hardware & Networking
Please tell us a bit about your UAV interest
I'm a free time autopilot systems designer
#UAV#UGV#UMV
Hometown:
Ja Ela, Sri Lanka

Comment Wall (4 comments)

At 8:03am on July 11, 2019, Charles Linquist said…

What do you want to know?  I won't give you 100% of the details, because I'm preparing a 4G telemetry/control + video product for sale.

I also am finalizing an Object Avoidance system using radar. It works with any Mavlink-Compatible flight controller and has a detection range of around 80 Meters, so it can be used at full speed.  The Object avoidance system takes control of the drone and makes it STOP,  they fly up and to the side (without moving forward), and when the object is cleared, normal flight resumes.  So it can be used in all modes - including AUTO.  I'll be selling that to Ainstein  (www.ainstein.ai) who will use it to fill out their product line.

At 1:38pm on July 11, 2019, d j said…
@Charles Linquist

I would like to buy your Radar collision avoidance, obstacle avoidance, object avoidance system, either directly or via Ainstein.
Unfortunately none marketed yet.

I have tested a number of forward looking lidar based radars but they fail to detect obstacles in direct sun, since reflected laser beam gets noised by a sunshine.

greetings
manta103g@gmail.com
At 7:08am on July 12, 2019, Charles Linquist said…

OK, I'll give you a few details.

I'm using a Raspberry pi 4, although a RPI 3B+ or RPI3A+ will work also. I also use a Raspberry pi camera.

Mounted on top is a SixFab Raspberry Pi 3G/4G "hat" with a Quectel EC-25X modem. Here, "X" is dependent on your cell carrier. I use the EC-25A for T-Mobile
the EC-25V for Verizon, The EC-25A-F works for both. You will need an antenna for the modem.
https://sixfab.com/
I have a 3-6GB/month SIM Card for the carrier.
I previously used a USB "dongle", but the "hat" makes for a cleaner installation.

The RPi connects to an Amazon ec-2 server via SSH. The Amazon server is running a "reverse" SSH Tunnel. This costs only a few dollars a month. But I am considering moving to LogMeIn HAMACHI for this function. I haven't made the change yet.

The Raspberry pi is running SER2NET (along with a bunch of other software). This allows for the connection of the Raspberry pi's serial port to the PixHawk at 500Kbaud.

I use a cell phone as a "hotspot" and then - using WiFi, I connect my laptop running Mission Planner to the net. In Mission Planner, I choose tcp as the protocol and point it to the Amazon server and correct port number (9999 is the one I use). Mission planner connects.

I use a hand-held controller that plugs into the USB port of my laptop. This hand-held controller is just like a FrSky or other controller and has a 6 position MODE switch. This is what I use to control the craft.

I bring up CHROME or FireFox browser and connect to the Amazon Server and a different port, and I get 1280 X 720 Streaming video at 30 fps from the craft.

I'm changing a few things to make it easier to setup and use, but that pretty much it.

My object avoidance processor currently handles only one radar unit (facing the front). But it would be easy to add 2 more (front, left side, right side) 

And by the way, the object avoidance processor also gives one other function: It adds redundancy to the radios.  It channels serial data from the Raspberry pi to the PixHawk, but uses another input for a 433MHz/915Mhz radio. If one source 'disappears' it fails over to the other.  It does this more efficiently than simply using another input on the Pixahawk.  So the Object Avoidance processor can be used with or without 4G.  It also handles any baud rate conversions necessary.   The Object Avoidance Processor is a TEENSY 3.5 unit.

I couldn't use the Raspberry for the Object Avoidance tasks because it only has one serial port.

Charles Linquist

At 8:38am on July 14, 2019, d j said…

I try to avoid ultrasonic sensors since they have been in use in cars for years but never replaced car radar, lidar radar implemented  today into autonomous cars.

Your

"I'm using a Raspberry pi 4, although a RPI 3B+ or RPI3A+ will work also. I also use a Raspberry pi camera. ..

looks really impressive and complicated to me, so I must give up and go back to lidar as a forward looking radar.

You need to be a member of DIY Drones to add comments!

Join DIY Drones

 
 
 

Groups

Season Two of the Trust Time Trial (T3) Contest 
A list of all T3 contests is here. The current round, the Vertical Horizontal one, is here

© 2019   Created by Chris Anderson.   Powered by

Badges  |  Report an Issue  |  Terms of Service