This is a recording dual-deploy altimeter for high power model rocketry
with integrated GPS and telemetry link.
-Production units are available from the
-[Garbee and Garbee](http://auric.gag.com) web
-store. TeleMetrum starter kits are also available from
-[Apogee Components](http://www.apogeerockets.com/Altus_Metrum_GPS.asp)
-and [Australian Rocketry](http://www.ausrocketry.com/shop/index.php?main_page=product_info&cPath=111&products_id=4302).
-
For the latest TeleMetrum firmware and related ground station software, please
visit the [AltOS](../AltOS) page on this site.
-These are photos of our current production version:
+These are photos of the previous production version (we haven't taken good
+pictures of v1.2 yet):
<a href="v1.1/telemetrum-v1.1-thside.jpg"> <img src="v1.1/telemetrum-v1.1-thside-thumb.jpg"></a>
<a href="v1.1/telemetrum-v1.1-smtside.jpg"> <img src="v1.1/telemetrum-v1.1-smtside-thumb.jpg"></a>
* Supports dual deployment (can fire 2 ejection charges)
* 70cm ham-band transceiver for telemetry downlink
* Barometric pressure sensor good to 45k feet MSL
-* 1-axis high-g accelerometer for motor characterization
+* 1-axis 70-g accelerometer for motor characterization
* On-board, integrated GPS receiver
* On-board non-volatile memory for flight data storage
* USB for power, configuration, and data recovery
* U.FL connector with 3.3V DC can be re-purposed for optional external amplified antennas
* async serial interface
* [Freescale MP3H6115A](http://www.freescale.com/webapp/search.partparamdetail.framework?PART_NUMBER=MP3H6115A6U) pressure sensor
- * [Freescale MMA2202EG](http://www.freescale.com/webapp/search.partparamdetail.framework?PART_NUMBER=MMA2202EG) 50g accelerometer. Can use 40-200g variants!
+ * [Analog Devices ADXL78](http://www.analog.com/en/mems-sensors/inertial-sensors/adxl78/products/product.html) 70g accelerometer.
* Software Features
* Written mostly in C with some 8051 assembler
* Runs from on-chip flash, uses on-chip RAM, stores flight data to
## [Flight Logs](flightlogs) ##
+## Videos ##
+
+There are a number of TeleMetrum customer and other
+[videos on YouTube](http://www.youtube.com/results?search_query=telemetrum)
+
## Artifacts ##
There is a single manual for TeleMetrum and all other Altus Metrum products,
Work on the next version proceeds on the master branch, with occasional
temporary branches created when Bdale is making some major / speculative
-change. Branched with names like 'v0.2' document what we're actually flying
-on the respective PCB revisions. The 'ground' branch has a cut-down schematic
-used to generate the BOM for partially loading v0.1 boards to used on the
-ground. We call the on-the-ground version '[TeleDongle](../TeleDongle)', and
-newer versions have their own PCB design.
+change. Branched with names like 'v1.2' document what we're actually flying
+on the respective PCB revisions.
For those who don't have ready access to the gEDA suite, here are pdf snapshots
-of the files for Production PCB version 1.1 in more easily readable form.
+of the files for Production PCB version 1.2 in more easily readable form.
-* [schematic](v1.1/telemetrum.pdf)
-* [pcb artwork](v1.1/telemetrum.pcb.pdf)
-* [bill of materials](v1.1/partslist.csv)
+* [schematic](v1.2/telemetrum.pdf)
+* [pcb artwork](v1.2/telemetrum.pcb.pdf)
+* [bill of materials](v1.2/partslist.csv)
Rockets we know of flying with TeleMetrum boards have exceeded 50g acceleration,
been well above Mach 1, and reached altitudes
## Future Plans ##
-TeleMetrum v1.2 is now out for production. The significant user-visible
-change is that we've moved to a 70g accelerometer by default, due to poor
-availability of the part we previously used due to damage to the Freescale
-facility in Sendai caused by the Japan earthquake / tsunami. Boards should
-be in stock again shortly before Christmas 2011, and full details will be
-posted here at that time.
-
-## 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 and later boards 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 ##
-
-### v1.0 ###
-
-These are photos of our third version, which was the basis of our first
-production build. These were sold between April and December 2010, and
-performed very well.
-
-<a href="v1.0/cimg5972-crop.jpg"> <img src="v1.0/cimg5972-thumb.jpg"></a>
-<a href="v1.0/cimg5974-crop.jpg"> <img src="v1.0/cimg5974-thumb.jpg"></a>
-
-The differences between v1.0 and v1.1 were small:
-
-* different flash memory part due to supplier availability problems
-* updated reset circuit to improve reliability at temperature extremes
-* changed the GPS antenna footprint to eliminate the large through-hole
- originally intended for use with a passive patch
-* irq line eliminated from the companion port
-* an additional resistor divider added to allow sampling the 5V supply
-
-The schematics and PCB artwork for this version are on the v1.0 branch in
-our git repository, here are pdf copies for easy reference:
-
-* [schematic](v1.0/telemetrum.pdf)
-* [pcb artwork](v1.0/telemetrum.pcb.pdf)
-* [bill of materials](v1.0/partslist.csv)
-
-
-### v0.2 ###
-
-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:
-
-<a href="v0.2/cimg5164-cropped.jpg"> <img src="v0.2/cimg5164-thumb.jpg"></a>
-<a href="v0.2/cimg5171-cropped.jpg"> <img src="v0.2/cimg5171-thumb.jpg"></a>
-
-Other than cleaning up the silkscreen, the differences between v0.2 and
-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:
-
-<a href="v0.1/loadedpair.jpg"> <img src="v0.1/loadedpair-thumb.jpg"></a>
-
-The differences between v0.1 and later boards were 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 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.
+TeleMetrum v1.2 is now available for sale. Eventually we'll run out of v1.2
+boards, and by then no dobut we'll have found more things to tweak...
-The schematics and PCB artwork for this version as of the working-v0.1 tag
-are available here are pdf copies for easy reference:
+## [History of TeleMetrum](history) ##
- * [schematic](v0.1/telemetrum.pdf)
- * [pcb artwork](v0.1/telemetrum.pcb.pdf)
- * [bill of materials](v0.1/telemetrum.bom)
projects / web / altusmetrum / blobdiff