Jack Crossfire's Blog – December 2009 Archive (5)

THIS WEEK IN MARCY 1 AVIATION

USB WORKS!





After 3 weeks, finally got USB on the 18F14K50 to work. Turns out the load capacitors on the crystal need to be symmetric. Asymmetric traces worked with everything else except USB.



Also 4 U assembly language freaks, some of the USB registers are not in the special function register access bank so you need BANKSEL calls.



HOME MADE RADIO WORKS!



Next came getting the radio to work… Continue

Added by Jack Crossfire on December 31, 2009 at 8:30pm — 5 Comments

XMAS BAY, XMAS GOLF 4 U, DEATH BY MARCY 1

XMAS BAY 4 U



Had the best weather ever on an XMas. Totally clear, no wind & warm inland.



Being the only day you can traverse the MacArthur maze in 1 day, took some snaps above Emeryville.













Moon over… Continue

Added by Jack Crossfire on December 25, 2009 at 10:54pm — 5 Comments

MARCY 1 GROUND STATION & 1M/S TREE FOOTAGE



So got up to this. Since the reference design has a header which doesn't allow USB & programming simultaneously we now have a header. Unfortunately still no USB even at slow speed. It detects the reset but never gets a transaction.



Even in circuit programming is super slow. Maybe that's related to the USB problem. This is the cleanest board we ever made but the programming speed only goes to 9375Hz. Tried disabling the radio,… Continue

Added by Jack Crossfire on December 18, 2009 at 12:39pm — No Comments

THIS WEEK IN AEROSPACE







There it is. The coveted $3.30 14.7456Mhz crystal. With that & a small bugfix installed, the C328 works perfectly at 115200, the pictures stream continuously from the microcontroller & we're up to XBee lockups.



Even 1 way communication locks up in this high interference environment because the ACKs collide. Your only option is… Continue

Added by Jack Crossfire on December 11, 2009 at 11:30am — 3 Comments

THIS WEEK IN AEROSPACE

5 FLIGHTS TO NOWHERE



FLIGHT #1



The severe wind storm crashed us real good into another roof.

Fortunately accessible by foot. Obviously either 40mph wind is above

limits or you need to tilt the engines.



FLIGHT #2



Aft propeller wouldn't spin. The crash must have damaged the propeller

so it wouldn't grab the crown nut.



FLIGHT #3



Aft propeller wouldn't spin again. The roof crash stripped the… Continue

Added by Jack Crossfire on December 4, 2009 at 12:59pm — 3 Comments

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