agmatthews
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  • Melbourne, Victoria
  • Australia
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Testing a SRF02 Sonar - partial FAIL

Started this discussion. Last reply by Thomas J Coyle III Nov 12, 2011. 1 Reply

An analysis of Sonar calibration issues

Started this discussion. Last reply by Randy Dec 11, 2011. 15 Replies

User Hooks

Started this discussion. Last reply by Miguel Astrain Nov 20, 2015. 13 Replies

 

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Hometown:
Melbourne, Australia

Agmatthews's Blog

Fancy LED lighting option for your flying machine

Posted on September 30, 2011 at 5:30pm 4 Comments

Today I spotted this "Digital Addressable RGB LED with PWM waterproof flexi strip" from Adafruit.

Each LED in this strip is individually addressable, meaning you can set the…

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Infrared beacon guidance for the arducopter

Posted on September 26, 2011 at 5:00am 31 Comments

Following Leon's great blog post showing the use of a camera from a WII remote as a 3D position sensor for his helicopter, I've been…

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Optic flow and the Franken aeroplane doing aerobatics

Posted on September 15, 2011 at 4:51am 1 Comment

Australian scientists have developed a novel autopilot that guides aircraft through complex aerobatic manoeuvres by watching the horizon…

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It's not unmanned but it is electric flight!

Posted on September 8, 2011 at 1:45am 4 Comments

On August 12, electrical/aerospace engineer and helicopter pilot Pascal Chretien took to the air in the world's first untethered, fully electric manned helicopter flight in a prototype machine that he designed and built almost entirely by himself within a 12 month development period. In his 2 minute, 10 second test flight, Chretien beat aviation giant Sikorsky…

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Attack of the birds

Posted on August 6, 2011 at 1:46am 3 Comments

Today's Arducopter flight got some attention from the locals

A flock of Galahs was grazing nearby when my Arducopter took off. It wasn't long before the Galahs took flight, formed a squadron, called "Tally Ho", and proceeded to chase down the interloper.…

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Comment Wall (2 comments)

At 4:18pm on February 7, 2010,
Developer
Jason Short
said…
agmatthews,
I reworked the uBlox code. I found it wasn't as good as I thought when I received it. It had quite a few bugs. Does my latest version fix your overflow issue?
Jason
At 3:04am on February 8, 2010, agmatthews said…
Jason,
We've identified two problems that seem to still be in the 2.5 GPS code

1) the value read for 'UBX_payload_length_hi' can be corrupted during a serial transmission. if the value then read is > 40 then the GPS code will write into memory beyond the UBX_buffer[]

2) The code that sets GPS_fix if(UBX_buffer[4] >= 0x03) reads the wrong part of the Ublox data
The U-Blox Protocol Spec says:
Important: To qualify a position as valid the gpsFixOK flag in the UBX-NAV-STATUS message has to be checked. gpsFix=3D/3D in the UBX-NAV-STATUS message does not qualify a fix as valid and within the limits.

To truly test for GPS NAV fix we need to test for something like this:
if((UBX_buffer[4] >= 0x03)&&(UBX_buffer[5]&0x01))

regards
Andrew

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