"I don't suppose there is a way to make this able to respond to multiple i2c address inquiries?
I'm just getting started with looking through what you wrote but I just found out that the spektrum data bus is i2c also, I was hoping that with…"
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agmatthews
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agmatthews's Discussions
Testing a SRF02 Sonar - partial FAIL
Started this discussion. Last reply by Thomas J Coyle III Nov 12, 2011. 1 Reply 0 Likes
An analysis of Sonar calibration issues
Started this discussion. Last reply by Randy Dec 11, 2011. 15 Replies 4 Likes
User Hooks
Started this discussion. Last reply by R_Lefebvre Jun 22, 2012. 10 Replies 2 Likes
agmatthews's Page
Latest Activity
Chris commented on agmatthews's blog post Creating an I2C sonar for Arducopter"I do not agree with wasting program space:
avr-size --mcu=atmega2560 --format=avr /tmp/ArduCopter.build/ArduCopter.elf AVR Memory Usage----------------Device: atmega2560
Program: 214054 bytes (81.7% Full)(.text + .data + .bootloader)
Data: 5544…"
DeveloperRandy commented on agmatthews's blog post Creating an I2C sonar for Arducopter
"For automatically detecting the sonar what we should do is have a very small detection class. This hopefully won't take very many bytes of RAM (eating program space is ok, we have enough). Then we call this detection class first..it…"
Chris commented on agmatthews's blog post Creating an I2C sonar for Arducopter"I have also just bought the i2c version of the max sonar. I already did some changes in the Ardupilot code regarding this. My concern of detecting it automatically is, that a dynamic creation would increase the code size. Right now I am using…"
DeveloperRandy commented on agmatthews's blog post Creating an I2C sonar for Arducopter
"John,
By the way, there is a library written to connect to the maxbotix i2c sonars. You can find this in the AP_RangeFinder directory in the Libraries…"
John Grouse commented on agmatthews's blog post Creating an I2C sonar for Arducopter"Just received MaxBotix new I2C XL MB1232 sonar in the post. Will test it on both APM and MultiWii controllers.
Regardless of the interface being I2C I will still hook it up with shielded wire around the four wires (connected to ground on…"
Redemptioner commented on agmatthews's blog post Creating an I2C sonar for Arducopter"Hey agmatthews,
Great work on this, just wondering if the "lego Arduino" is pretty much the same thing as the Arduino mini, looks similar but has a usd "stick" on the end so it can be plugged directly into a usb port. At present…"
agmatthews left a comment for Peleus"I'm guru on this stuff just a dabbler - be prepared for dissapointment"
Stefan Gofferje replied to agmatthews's discussion Arducopter navigation with Wii camera"I didn't expect your work to be field worthy yet :). Neither is my idea - I'm just starting with the whole quadcopter-stuff.
I think, the problem with the sun could easily be solved by using appropriate filters and implementing some kind…"
agmatthews replied to agmatthews's discussion Arducopter navigation with Wii camera"I'd have to say Randys on the money here
What may suit you rather than a laptop is a GPS / microcontroller / 3DR radio combined with battery all in a waterproof box on the boat - transmitting the 'follow me' signal to the…"
Stefan Gofferje replied to agmatthews's discussion Arducopter navigation with Wii camera"Yeah, but that requires a rugged laptop with Windows which I both don't have (I'm a Linux guy).
Most of our boats are open speed RIBs, so a normal laptop would be a rather bad idea :).
A small IR beacon, however, could but casted in epoxy…"
DeveloperRandy replied to agmatthews's discussion Arducopter navigation with Wii camera
"Stefan,
There is apparently a "follow me" feature in the mission planner. I think this would likely be more reliable but your choice!"
Stefan Gofferje replied to agmatthews's discussion Arducopter navigation with Wii camera"This is impressive! I just registered and my plan is to build a copter that could follow our rescue boat (inland water rescue) in some altitude and provide an bird's eye view in missing person searches. Using an IR beacon would make the whole…"
agmatthews commented on Carl Myhre's blog post I2CXL-MaxSonar®-EZ™ Sensor Line Released!"@Randy,
I've now got my I2C sonar code working with the 2.71 code (ie with the new i2c.h library).Using i2C sonar may allow us to get back into collision avoidance - I'm thinking using sequenced sonars to ping in turn (to avoid intra sonar…"
agmatthews commented on Carl Myhre's blog post I2CXL-MaxSonar®-EZ™ Sensor Line Released!"Sounds familiar - oh look -> http://diydrones.com/profiles/blogs/creating-an-i2c-sonar-for
:-)
Good to see a quality sonar with i2c interface direct from a manufacturer
I've recently been trying to compile my original i2c sonar code into…"
DeveloperR_Lefebvre replied to agmatthews's discussion User Hooks
"That would be perfect. I'm always in support of better documentation."
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Agmatthews's Blog
Fancy LED lighting option for your flying machine
Posted on September 30, 2011 at 5:30pm 4 Comments 4 Likes
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…
Continue Infrared beacon guidance for the arducopter
Posted on September 26, 2011 at 5:00am 29 Comments 8 Likes
Optic flow and the Franken aeroplane doing aerobatics
Posted on September 15, 2011 at 4:51am 1 Comment 5 Likes
Australian scientists have developed a novel autopilot that guides aircraft through complex aerobatic manoeuvres by watching the horizon…
It's not unmanned but it is electric flight!
Posted on September 8, 2011 at 1:45am 4 Comments 3 Likes
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…
Attack of the birds
Posted on August 6, 2011 at 1:46am 3 Comments 8 Likes
Comment Wall (2 comments)
- At 4:18pm on February 7, 2010,
Developerjasonshort 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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