Changes between Version 21 and Version 22 of WikiStart


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Oct 9, 2013, 9:23:26 PM (12 years ago)
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smoser
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  • WikiStart

    v21 v22  
    1111=== Client ===
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    13 [attachment:Flarmradar_GS6.png The concept]] of the client is quite simple to understand. The client reads the Data Port from any regular FLARM device (RS232 interface) and streams the data (via the HTTP protocol) to the server. Since data streaming does not require much computing power, a mini-computer like the [http://www.raspberrypi.org Raspberry PI] is sufficient. This is a credit-card sized computer that is able to run a Linux operating system (Raspbian) at negligible cost (50$ or so).
     13[attachment:Flarmradar_GS6.png The concept] of the client is quite simple to understand. The client reads the Data Port from any regular FLARM device (RS232 interface) and streams the data (via the HTTP protocol) to the server. Since data streaming does not require much computing power, a mini-computer like the [http://www.raspberrypi.org Raspberry PI] is sufficient. This is a credit-card sized computer that is able to run a Linux operating system (Raspbian) at negligible cost (50$ or so).
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     15Alternatively, for standalone installations with a local Flarmradar-Server, the client can be installed on the same computer where the server is installed. ds
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     17People that are not afraid of burning one's fingers when handling the soldering-iron can assemble and construct a ground station with the [wiki:construction_manual construction manual].
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    17 ==== Infrastructure & Assembly ====
    18 We used the following components to build up our client infrastructure. Note that links provided are just proposals for your convenience, other components will also work.
    19   - a FLARM device
    20   - a [http://www.raspberrypi.org Raspberry PI]
    21   - Power supply:
    22    - As Flarm is running on 12V and to ease use of a mobile flarmradar gound station powered by a 12V battery, we recommend a 12V power supply for the flarmradar ground station (FGS)
    23     - Use a standard power converter (e.g. [http://de.rs-online.com/web/p/steckernetzteile/6666928/ RS-Online]) if an electical outlet is available to power the FGS
    24     - For battery powered FGS, use a 12V battery as used in most gliders
    25     - To connect the FGS to external power supply or battery, use a connector, which is protected against polarity reversal (e.g. [http://de.rs-online.com/web/p/dc-buchsen/7684419/ RS-Online])
    26     - To protect your Flarm against over current, a 500mA fuse should be installed in the power supply route to the Flarm (e.g. [http://de.rs-online.com/web/p/sicherungshalter-fuer-frontplattenmontage/3595961/ RS-Online])
    27     - To connect your Flarm to the FGS, we recommend installing a RJ45 connector on the FGS front panel and to use a short network cable to connect the FGS to the Flarm
    28     - For pin assignment of the RJ45 please consult [http://www.flarm.com/support/manual/FLARM_InstallationManual_v5.00E.pdf Flarm Installation Manual]
    29     - Wiring instructions: 12V DC In --> Flarm fuse --> RJ45 connector --> network cable --> Flarm
    30     - Alternative way of Flarm power supply: [http://shop.segelflugbedarf24.de/product_info.php?info=p32_Update-Cable-RS232.html update cable]
    31    - Raspberry is running on a 5V power supply therefore the 12V power supply must be converted to 5V for the Pi.
    32     - Power conversion can be performed using DC/DC converter. Make sure the DC/DC converter can deliver at least 1A.
    33     - To protect your Pi against over current, a 500mA fuse should be installed in the power supply route to the Pi (e.g. [http://de.rs-online.com/web/p/sicherungshalter-fuer-frontplattenmontage/3595961/ RS-Online])
    34     - Use a Micro-USB connector to feed the power into your pi
    35     - Wiring instructions: 12V DC IN --> Pi Fuse --> DC/DC converter --> Micro-USB connector --> Pi
    36     - Alternative way of Pi power supply: A USB charger to power the Raspberry, just make sure it can deliver at least 1000mA
    37    - All in one power supply: The Mean Well power converter [http://www.meanwell.com/search/ADD-55/ADD-55-spec.pdf ADD-55A] offers 12V and 5V power output which can be run on standard power supply (88-264VAC) when available. If no power line is availble the device features a battery connection, which serves as backup power source.
    38   - Flarm <--> Pi Data connection
    39    - Flarm delivers RS232 signal on its data port. To feed this signal into the Pi, there are presently two alternative ways of doing:
    40    - RS232-USB-cable
    41     - Buy a RS232 to USB converter cable. Preferable one which uses the FTDI chipset (e.g TBD). If you use a different chipset, this may not be supported by default by the Pi operating system.
    42     - Attach the converter to your Flarm and to one of the USB connectors on the Pi
    43    - Serial-In of the Pi
    44     - The Pi features a serial interface (UART) on its GPIO pins.
    45     - Pi's serial interface works on 3.3V. Hower, Flarm supplies higher signal levels. DO NOT CONNECT THE FLARM DATA LINES DIRECTLY TO THE PI'S GPIO PINS!!!
    46     - Buy a RS232 to TTL level shifter (e.g. [http://www.ebay.de/itm/115200bps-Stucke-Mini-RS232-auf-TTL-Converter-Module-Konverter-Board-MAX3232-/261070156589?pt=Wissenschaftliche_Geräte&hash=item3cc8fe732d E-Bay] - costs less than 2 EUR)
    47     - Solder Flarm's TX, RX and ground (coming from the RJ45 jack) onto the RS232 side of the level shifter. Most level shifters have well labeled soldering pads
    48     - Solder 4 wires to the TTL side of the level shifter. Ground, +3.3V, TX and RX need to be connected
    49     - Buy a 2x13 IDC connector which attaches to the Pi's GPIO pin headers (e.g. [http://de.rs-online.com/web/p/idc-steckverbinder/3237902/ RS-Online])
    50     - Connect the four wires coming from the TTL side of the level shifter to the IDC connector. Pin layout depends on the version of your Pi. See [http://www.raspberrypi-spy.co.uk/2012/06/simple-guide-to-the-rpi-gpio-header-and-pins/ GPIO Pins]. If you have a revision 2 Pi, this is the pin connection: Pin1=+3.3V, Pin6=GND, Pin8=TX, Pin9=RX.
    51     - Disable console output and boot messages on the serial interface. See [http://www.irrational.net/2012/04/19/using-the-raspberry-pis-serial-port/ here]
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    55 - optional, recommended for a stationary installation: we use currently an [http://shop.segelflugbedarf24.de/product_info.php?info=p29_FLARM--Outside-Antenna-4-m-cable.html external antenna]
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