This is a recording dual-deploy altimeter for high power model rocketry
with integrated telemetry link.
+<a href="loadedpair.jpg"> <img src="loadedpair-thumb.jpg"></a>
<a href="rawfront.jpg"> <img src="rawfront-thumb.jpg"></a>
<a href="rawback.jpg"> <img src="rawback-thumb.jpg"></a>
* Serial port for attachment of GPS module
* USB for power, configuration, and data recovery
* Integrated support for LiPo rechargeable batteries
-* Designed to fit 29mm airframe coupler tube
+* 2.5 x 1 inch board designed to fit inside 29mm airframe coupler tube
### Developer View ###
* USB serial emulation for "console" interface
* USB mass storage emulation for data recovery
* Tools Used
- * [gEDA](http://geda.seul.org/) for schematic capture and PCB layout
+ * [gEDA](http://www.gpleda.org/) for schematic capture and PCB layout
* [SDCC](http://sdcc.sourceforge.net/) compiler and source debugger
* [FreeRTOS](http://www.freertos.org/) kernel
* Licenses
## 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).
-
-As of 6 January 2009, the raw boards are here, so we're nearly ready to try
-building our first prototype! Stay tuned for updates, and note that
-Bdale will be giving an update in his session at Linux Conference Australia
-in late January...
-
+[git.gag.com](http://git.gag.com). The 'fab' tag on the master branch reflects
+the artwork as sent out for PCB fab. The 'loaded' tag on the master branch
+indicates the parts Bdale loads for a functional board, but the schematic
+does not reflect the cuts and jumps or added resistors. The 'nextcut' branch
+is work towards our next PCB revision. The 'ground' branch has a cut-down
+schematic used to generate the BOM for partially loading boards to use in
+the matching TeleTerra ground station design.
+
+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 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!
projects / web / altusmetrum / blobdiff