From 86d6c2de8cbbb48c5376edb4d1d58fb2efebb6f5 Mon Sep 17 00:00:00 2001 From: Bdale Garbee Date: Tue, 27 Jul 2010 12:05:58 -0600 Subject: [PATCH] working on making current and old board info more distinguishable --- TeleMetrum/index.mdwn | 91 ++++++++++++++++++++++++++++++------------- 1 file changed, 63 insertions(+), 28 deletions(-) diff --git a/TeleMetrum/index.mdwn b/TeleMetrum/index.mdwn index e5fc6e3..805d134 100644 --- a/TeleMetrum/index.mdwn +++ b/TeleMetrum/index.mdwn @@ -12,20 +12,6 @@ integrated GPS receiver with active patch antenna: -These are photos of our second version, which included the integrated Venus -GPS receiver, but with a passive patch antenna that turned out to have -disappointing performance due to our many PCB geometry constraints. It also -used a voltage regulator with less capacity which we felt was marginal for -supporting the companion boards we have planned: - - - - -And this is a photo of our original board with serial port for off-board GPS, -without the big off-board 1000uF cap from the original ejection circuit: - - - ## Motivation ## Bdale and Keith both own @@ -101,12 +87,6 @@ always want GPS on board, which lead to our current second generation boards. * The hardware is licensed under the [TAPR](http://www.tapr.org) [Open Hardware License](http://www.tapr.org/ohl.html) * The software is licensed [GPL version 2](http://www.gnu.org/licenses/old-licenses/gpl-2.0.html) -### v0.2 Differences ### - -* 100ma LDO regulator instead of the current 150ma part -* no C38 footprint -* different value for C36 reset capacitor - ### v0.1 Differences ### * 2.5 x 1 inch board with all parts mounted on one side @@ -184,14 +164,6 @@ of files in more easily readable form. * [schematic](v1.0/telemetrum.pdf) * [pcb artwork](v1.0/telemetrum.pcb.pdf) * [bill of materials](v1.0/partslist.csv) -* These are from the v0.2 branch: - * [schematic](v0.2/telemetrum.pdf) - * [pcb artwork](v0.2/telemetrum.pcb.pdf) - * [bill of materials](v0.2/partslist.csv) -* These are as of the working-v0.1 tag: - * [schematic](v0.1/telemetrum.pdf) - * [pcb artwork](v0.1/telemetrum.pcb.pdf) - * [bill of materials](v0.1/telemetrum.bom) Our [AltOS](../AltOS) firmware works well enough that we now routinely fly TeleMetrum with no backup. Rockets with v0.1 boards have exceeded 50g @@ -213,3 +185,66 @@ As of May 2010, version v1.0 is available for sale from the 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). + +## History ## + +### v0.2 ### + +* 100ma LDO regulator instead of the current 150ma part +* no C38 footprint +* different value for C36 reset capacitor + +These are photos of our second version, which included the integrated Venus +GPS receiver, but with a passive patch antenna that turned out to have +disappointing performance due to our many PCB geometry constraints. It also +used a voltage regulator with less capacity which we felt was marginal for +supporting the companion boards we have planned: + + + + +Other than cleaning up the silkscreen, the differences between v0.2 and our +current v1.0 boards were really quite small: + +* 100ma LDO regulator instead of the current 150ma part +* no C38 footprint +* different value for C36 reset capacitor + +The schematics and PCB artwork for this version are on the v0.2 branch in +our git repository, here are pdf copies for easy reference: + + * [schematic](v0.2/telemetrum.pdf) + * [pcb artwork](v0.2/telemetrum.pcb.pdf) + * [bill of materials](v0.2/partslist.csv) + +### v0.1 ### + +And this is a photo of our original board with serial port for off-board GPS, +without the big off-board 1000uF cap from the original ejection circuit: + + + +The differences between v0.1 and later boards were more substantial: + +* 2.5 x 1 inch board with all parts mounted on one side +* 4-pin PicoBlade serial port connector for attachment of external GPS module +* USB connector projected approximately 3mm over the edge of the board +* Debug connector used 4 IC socket pins on 100 mil centers +* no companion board interface +* 50ma LDO regulator on early boards, later boards used a 100ma part +* [Microchip 25LC1024](http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en520389) CMOS serial EEPROM instead of DataFlash + * 128k x 8 + * SPI interface +* [Microchip MCP9700A](http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en027103) discrete temperature sensor +* used 1000uF electrolytic capacitor charged to 5V for pyro supply +* two LEDs instead of one attached to CPU + +The elimination of the discrete temperature sensor and second LED were +necessary to support the companion board interface added in v0.2. + +The schematics and PCB artwork for this version as of the working-v0.1 tag +are available here are pdf copies for easy reference: + + * [schematic](v0.1/telemetrum.pdf) + * [pcb artwork](v0.1/telemetrum.pcb.pdf) + * [bill of materials](v0.1/telemetrum.bom) -- 2.30.2