"Jack, try Webench Designer by National (now TI) http://webench.ti.com? Feed it your requirements and it prints out a schematic, bom, etc and you can simulate it. It came up using a TLV62130 at 88% eff. for a 3S, smallest design, 3…"
"My wag is it's easier to hit closer to the desired landing spot, a flare adds more variability, ok if you have a lot of runway. I keep thinking it looks like a mini B2. Also like the old work horse chase plane. Nice…"
I'm in the process of building one up too, although I'm running out of room for my UDB and FPV. Have you opened the belly area up to place your equipment in there (that's what I'm thinking of doing)"
"Quoting my source http://en.wikipedia.org/wiki/Lithium_air_battery
The theoretical specific energy (of a LiO2 battery) excluding oxygen is 11140 Wh/kg, or 40.1 megajoules per kilogram. Compare this to the figure of 44 megajoules per kilogram for…"
"Thanks for your input as always Ken. Not sure if I should keep hijacking nilbo's thread...or post a new one, let me know... but here goes...
(this is for the UDB board and not for the APM). Since the UDB board uses the HS 16Mhz…"
I have a somewhat related question with the Mediatek. I was trying to adapt it to the UDB red board but found the 38400 baud rate having to much % error in the serial stream from the dspic to reliably communicate with it. I could…"
"Looks like Stanford has moved away from their very precise and safe driving control strategies they exhibited in the Grand and Urban Challenges to a more non-linear regime. Looks like they are still putting their Velodyne and Riegl sensors to good…"
"I guess I wouldn't let that discourage you, apply anyway and let them decide. I also just got this today:
Edwards AFB also has an excellent co-op/intern program here at the Air Force Flight Test Center. We strive to provide our students with…"
I have since abandoned that project for now, simply since the actual OSD function on the unit does not seem to work with PAL video at all. I got no real support from TechFX for this other than 'uh, I tested it to work before I sent it' which needless to say does nor help me.
The unit itself is rather well made but I have not bothered to do any programming on it since the OSD function was what I wanted to integrate, so now I am making my own ARM based controller. If you are planning to use multiple cameras I have also made video switching units for this now :), if youre interested drop me a mail.
The direction cosines can be converted to Euler angles without using arcsin, so the conversion can be done without considering the scaling. In MatrixPilot, we do the conversions with three calls to a CORDIC based rectangular to polar conversion.
You do not need to consider scaling for atan2(). You do need to consider it for arcsin(). In which case you just need to know that the cosine of 0, which is 1.0, is represented as 16384.
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