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authorBdale Garbee <bdale@gag.com>2010-07-27 12:10:39 -0600
committerBdale Garbee <bdale@gag.com>2010-07-27 12:10:39 -0600
commit3233348ab772abdb48c1f176075ce7cc99e42875 (patch)
treed1e1f87a71730407bd4f9a354abda63d59b27de2 /TeleMetrum
parent0508a9a03c4f056fdb27249db2e0c5ccee8c348e (diff)
more text moves
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diff --git a/TeleMetrum/index.mdwn b/TeleMetrum/index.mdwn
index d78b415..aea96d9 100644
--- a/TeleMetrum/index.mdwn
+++ b/TeleMetrum/index.mdwn
@@ -91,37 +91,6 @@ always want GPS on board, which lead to our current second generation boards.
## [Flight Logs](flightlogs) ##
-## 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! Without an inspection microscope, loading and testing these
- boards might be impossible.
-
-* The addition of on-board GPS in v0.2 means that the total power consumption
- can exceed the rate at which we draw power from the USB interface,
- particularly when the GPS is in cold start mode. This means a battery must
- be attached during operation, and also that the battery will only charge
- effectively from USB when the board is turned off.
-
-* The v0.1 artwork had three issues, two of which required physical rework
- on each board. All of these issues were fixed in v0.2.
-
- * The USB connector footprint was placed wrong, so that the
- connector hung out over the edge of the board instead of being
- flush.
- * We needed chip select on the SPI memory. To fix that, we gave up the
- ability to put the accelerometer into self-test mode and used that
- GPIO line to pull chip select on the memory, which required two
- cuts and two jumpers.
- * The igniter sense circuits each needed a second resistor to
- complete the voltage divider so our 3.3V CPU ADC could read the
- 5V ejection voltage. This was fixed by changing two resistor
- values, and tacking two additional resistors onto the board
- with jumpers to ground.
-
## Artifacts ##
The user manual for TeleMetrum is available in
@@ -168,6 +137,21 @@ Because we understand that not everyone uses Linux, development of a new
cross-platform ground station program written in Java is underway for use with
[AltOS](../AltOS).
+## 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! Without an inspection microscope, loading and testing these
+ boards might be impossible.
+
+* The addition of on-board GPS in v0.2 means that the total power consumption
+ can exceed the rate at which we draw power from the USB interface,
+ particularly when the GPS is in cold start mode. This means a battery must
+ be attached during operation, and also that the battery will only charge
+ effectively from USB when the board is turned off.
+
## History ##
### v0.2 ###
@@ -224,6 +208,22 @@ The differences between v0.1 and later boards were more substantial:
The elimination of the discrete temperature sensor and second LED were
necessary to support the companion board interface added in v0.2.
+The v0.1 artwork had three issues, two of which required physical rework
+on each board. All of these issues were fixed in v0.2.
+
+* The USB connector footprint was placed wrong, so that the
+ connector hung out over the edge of the board instead of being
+ flush.
+* We needed chip select on the SPI memory. To fix that, we gave up the
+ ability to put the accelerometer into self-test mode and used that
+ GPIO line to pull chip select on the memory, which required two
+ cuts and two jumpers.
+* The igniter sense circuits each needed a second resistor to
+ complete the voltage divider so our 3.3V CPU ADC could read the
+ 5V ejection voltage. This was fixed by changing two resistor
+ values, and tacking two additional resistors onto the board
+ with jumpers to ground.
+
The schematics and PCB artwork for this version as of the working-v0.1 tag
are available here are pdf copies for easy reference: