1 [[!meta title="TeleMetrum"]]
4 This is a recording dual-deploy altimeter for high power model rocketry
5 with integrated GPS and telemetry link.
7 For the latest TeleMetrum firmware and related ground station software, please
8 visit the [AltOS](../AltOS) page on this site.
10 These are photos of production version 3.0:
12 <a href="v3.0/telemetrum-v3.0-th.jpg"> <img src="v3.0/telemetrum-v3.0-th-thumb.jpg"></a>
13 <a href="v3.0/telemetrum-v3.0-smt.jpg"> <img src="v3.0/telemetrum-v3.0-smt-thumb.jpg"></a>
15 v3.0 was introduced in late 2019, and is now available for sale.
21 * Recording altimeter for model rocketry
22 * Supports dual deployment (can fire 2 ejection charges)
23 * 70cm ham-band transceiver for telemetry downlink
24 * Barometric pressure sensor good to 100k feet MSL
25 * 1-axis 200-g accelerometer for motor characterization
26 * On-board, integrated GPS receiver
27 * On-board non-volatile memory for flight data storage
28 * USB for power, configuration, and data recovery
29 * Integrated support for LiPo rechargeable batteries
30 * Uses LiPo to fire e-matches, can be made to support separate pyro battery
31 * 2.75 x 1 inch board designed to fit inside 29mm airframe coupler tube
33 ### Developer View ###
35 * Hardware Features of v3.0
36 * ST Micros [STM32L151](http://www.st.com/internet/mcu/product/248821.jsp) ARM Cortex M3 based Microcontroller
37 * TI [CC1200](http://www.ti.com/product/cc1200) Low Power, High Performance RF Transceiver
38 * 150mA 3.3V LDO regulator
39 * [Winbond W25Q64CV](http://www.winbond.com/hq/enu/ProductAndSales/ProductLines/FlashMemory/SerialFlash/W25Q64CV.htm) serial flash memory
40 * [u-blox](http://www.u-blox.com/) MAX-8Q GPS receiver
41 * on-board passive patch antenna
42 * async serial interface
43 * Measurement Specialties [MS5607](http://www.meas-spec.com/product/t_product.aspx?id=8499) Micro Altimeter Module
44 * Wide range — 120kPa to 1kPa (approximately -1500m to 31000m)
45 * High precision — 2.4Pa resolution (approximately 20cm at sea level)
47 * Analog Devices [ADXL375](https://www.analog.com/en/products/adxl375.html) 3-Axis Digital MEMS Accelerometer
51 * Written mostly in C with some ARM assembler
52 * Runs from on-chip flash, uses on-chip RAM, stores flight data to serial flash
53 * USB serial emulation for "console" interface
55 * [Lepton EDA](https://github.com/lepton-eda/lepton-eda) for schematic capture
56 * [pcb-rnd](http://repo.hu/projects/pcb-rnd/) for PCB layout
58 * The hardware is licensed under the [TAPR](http://www.tapr.org) [Open Hardware License](http://www.tapr.org/ohl.html)
59 * The software is licensed [GPL version 2](http://www.gnu.org/licenses/old-licenses/gpl-2.0.html)
61 Compared with v2 series, v3 includes a better GPS (uBlox v8 vs v7),
62 the TI CC1200 radio used in our other products instead of the CC1120
63 used only in TeleMetrum v2 (more or less the same performance, but one less
64 device driver for us to have to worry about!), and more accelerometer
65 range with approximately the same precision.
69 There are a number of TeleMetrum customer and other
70 [videos on YouTube](http://www.youtube.com/results?search_query=telemetrum)
74 There is a single manual for TeleMetrum and all other Altus Metrum products,
75 which is available in [html](../AltOS/doc/altusmetrum.html) and
76 [pdf](../AltOS/doc/altusmetrum.pdf) formats.
78 An outline of the board with drill hole locations is available in
79 [pdf](../Documents/telemetrum-outline.pdf) format.
81 This board was designed using lepton-eda and pcb-rnd.
83 The hardware design files are available from
84 [git.gag.com](http://git.gag.com) in the project
85 [hw/telemetrum](http://git.gag.com/?p=hw/telemetrum;a=summary).
87 Work on the next version proceeds on the master branch, with occasional
88 temporary branches created when Bdale is making some major / speculative
89 change. Branched with names like 'v3.0' document what we're actually flying
90 on the respective PCB revisions.
92 For those who don't have ready access to the gEDA suite, here are pdf snapshots
93 of the files for Production PCB version 3.0 in more easily readable form.
95 * [schematic](v3.0/telemetrum-sch.pdf)
96 * [pcb artwork](v3.0/telemetrum-pcb.pdf)
97 * [bill of materials](v3.0/partslist.csv)
99 Rockets we know of flying with TeleMetrum boards have exceeded 50g acceleration,
100 been well above Mach 1, and reached altitudes
101 greater than 25k feet AGL with great results. Keith's second generation
102 ground station program called AltosUI works on Windows, Mac, and Linux systems
103 and logs telemetry to disk, displays current and max values for key parameters
104 during flight, includes voice synthesis during the flight so that
105 our eyes can stay on the rockets, and even includes live display of rocket
106 position over moving maps! After flight, altosui can extract the
107 complete flight log from TeleMetrum, can display plots of the data from either
108 the telemetry received by radio or the onboard flight log, can output a kml
109 file for use with [Google Earth](http://earth.google.com), and can also
110 output all the flight data as a csv file for easy import to spreadsheet
111 programs or other analysis tools allowing you to perform whatever
112 custom analysis you can envision! More details on the software,
113 including full source code and pre-built packages
114 can be found on the [AltOS](../AltOS) page on this site. Feel free to
115 download the software and try it before purchasing our hardware!
117 ## [History of TeleMetrum](history) ##