diff options
| -rw-r--r-- | TeleMetrum/index.mdwn | 33 |
1 files changed, 25 insertions, 8 deletions
diff --git a/TeleMetrum/index.mdwn b/TeleMetrum/index.mdwn index 04b543f..fd35677 100644 --- a/TeleMetrum/index.mdwn +++ b/TeleMetrum/index.mdwn @@ -76,16 +76,33 @@ simplify things by building a new altimeter with integrated RF link! ## Problems ## -* The CC1111F32 is a 36-pin QFN package, which necessitates reflow soldering. - -* Since we needed to reflow solder anyway, and because TI used them in their - reference design, we went a little crazy and used 0402 passive parts - everywhere. That means working under a microscope to place parts! +* The CC1111F32 is a 36-pin QFN package, which necessitates reflow + soldering. Since we needed to reflow solder anyway, and because TI used + them in their reference design, we went a little crazy and used 0402 + passive parts everywhere. That means working under a microscope to + place parts! Without an inspection microscope, loading and testing these + boards might be impossible. + +* The v0.1 artwork has two issues that require cuts and jumps. The first is + that we need chip select on the SPI memory. To fix that, we give up the + ability to put the accelerometer into self-test mode and use that GPIO line + to pull chip select on the memory. The second is that the igniter sense + circuits each need a second resistor to complete the voltage divider so our + 3.3V CPU ADC can read the 5V ejection voltage. This is fixed by changing + two resistor values, and tacking two additional resistors onto the board + with jumpers to ground. ## Artifacts ## The hardware design current gEDA files are available from -[git.gag.com](http://git.gag.com). +[git.gag.com](http://git.gag.com). + +Keith has working data collection firmware, however the firmware is under a +massive, rapid rewrite to eliminate FreeRTOS which is much more generalized +and capable than we need... and consuming more system resources than we +can tolerate. As soon as we're over this transition, the sourcecode to the +firmware and related tools will also be made available. -As of 6 March 2009, the first two boards are loaded, and we're about to start -turning them on and testing things! +As of 11 April 2009, the first two boards are fully checked out, we have some +initial firmware capable of data logging ready, and as soon as we get a good +day to fly we hope to log our first flight data! |