MicroPeak boost detect is 120Pa or almost exactly 10m at sea level
[web/altusmetrum] / MicroPeak / index.mdwn
1 [[!meta title="MicroPeak"]]
2 <img src="../logos/micropeak-oneline.svg" height="100"/>
3
4 # Introducing MicroPeak by AltusMetrum #
5
6 Micropeak is a peak-recording barometric altimeter for precision model
7 rocketry altitude measurements.
8
9 <a href="v1.0/micropeak-dime.jpg"><img
10 src="v1.0/micropeak-dime-640.jpg"></a>
11
12 Production units are available from the
13 [Garbee and Garbee](http://auric.gag.com/index.php?route=product/product&product_id=80) 
14 web store and [Apogee Components](http://www.apogeerockets.com/Electronics_Payloads/Altimeters/MicroPeak_Altimeter)
15
16 ## Documentation ##
17
18 The MicroPeak manual is available in
19 [html](../AltOS/doc/micropeak.html) and
20 [pdf](../AltOS/doc/micropeak.pdf) formats.
21
22 ## Hardware Features ##
23
24  * Measure ground pressure and peak altitude pressure.
25  * Orange LED blinks out maximum height in decimeters.
26  * 18mm x 14mm. 1.9g including battery.
27  * Power switch.
28
29 The CR1025 battery holder is mounted on the back side of the board, so there are no external wires or batteries to manage.
30
31 ## Software features ##
32
33  * Saves last flight data to non-volatile memory.
34  * Reports previous flight on power-on.
35  * Automatically shuts down on landing to preserve battery.
36
37 ## Battery Holder ##
38
39 MicroPeak includes an integrated battery holder on the back side of
40 the circuit board.
41
42 <a href="v1.0/micropeak-back.jpg"><img
43 src="v1.0/micropeak-back-640.jpg"></a>
44
45 ## Developer View ##
46
47 Here's a close-up view of the hardware
48
49 <a href="v1.0/micropeak.jpg"><img src="v1.0/micropeak-640.jpg"></a>
50
51  * Hardware Features
52         * [ATMEL ATtiny85](http://www.atmel.com/devices/attiny85.aspx) Microcontroller
53                 * 8K flash
54                 * 512B RAM
55                 * 512B EEPROM
56                 * SPI/I2C interface
57         * [Measurement Specialties MS5607](http://www.meas-spec.com/product/t_product.aspx?id=8499) Micro Altimeter Module
58                 * Wide range — 120kPa to 1kPa (approximately -1500m to 31000m)
59                 * High precision — 2.4Pa resolution (approximately 20cm at sea level)
60                 * Factory calibrated.
61         * CR1025 Lithium Battery
62                 * 30mAh. Runs MicroPeak for more than 40 hours on the pad or in flight
63         * [OSRAM LO T67K](http://catalog.osram-os.com/catalogue/catalogue.do?favOid=000000000002269f00090023&act=showBookmark) orange LED
64         * Standard 6-pin AVR programming interface.
65
66  * Software Features
67         * Written in C
68         * Samples pressure every 96ms
69         * Delay 30s after power-on to finish airframe prep
70         * Detect boost with 10m altitude change
71         * Exponential averaging filter to minimize transient effects.
72
73  * Tools Used
74         * [gEDA](http://www.gpleda.org/) for schematic capture and PCB layout
75         * [GCC](http://gcc.gnu.org) as an AVR cross-compiler
76
77  * Licenses
78         * The hardware is licensed under the [TAPR](http://www.tapr.org) [Open Hardware License](http://www.tapr.org/ohl.html)
79         * The software is licensed [GPL version 2](http://www.gnu.org/licenses/old-licenses/gpl-2.0.html)
80
81 <center><img src="../logos/micropeak.svg" height="64"/>