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7W boosters for OpenLRS Project

Posted by Melih Karakelle on December 10, 2010 at 12:00pm

Hi Guys

Good news from OpenLRS (Opensource Long Range System) project!

Today i received 7 watt RF booster chips and at last i'm ready to finishing the PCB designs. This weekend i will finish the booster design and PCBs will be ready in 3 weeks.

Here is the latest PCB designs of Tx, Rx and IMU modules of OpenLRS

Tx and Rx modules size smaller than most of RC modules. Rx module including I2C (or 3 adc) conector pads on back side. I'm planning to connect my new 6DOF IMUnext v3 board there. Rx can stabilize the plane (or quadro) without any external parts and it sends the parameters to the ground over telemetry system. And Rx's rs232 port already available for digital telemetry or direct GPS connection.

Some advantages of OpenFARC:

  • Direct ground computer based remote control and telemetry (Autopilot by computer?)
  • Rx based Autopilot/stabilization/return to home.
  • No Frequency hoping. I'm planning to using static 2 frequency switching for safety. You can use 2 or more modules for receiving the telemetry signals or transmitting the controls with static frequency, because you know your frequencies. Or hopping already possible.
  • If you want to use it for really long range, you can add 7W booster on Tx module (only one way control without telemetry)
  • Direct analog RSSI output on Rx
  • RS232 telemetry and commandset (like "S2512" mean turn the 2th servo to center position,etc)

I'm developing OpenLRS project with AVR-GCC on Atmega328 chipset. All ATMEL developers are welcome ;)

Tags: openlrs
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Comments

  • Melih Karakelle December 16, 2010 at 1:49am

    @Happy

    I'm planning to using full transparent RS232 9600baud gate for current autopilots or other telemetry systems. It will work like Xbee modules.

    And i want to design another protocol like DeviceID,SensorID,Data  protocol. And OpenLRS's cpu's DeviceID will be "1" , and autopilot or ground station can send "1,1,250" for "set the 1th servo to 250" or "1,101,250" for "roll the plane to 25 degree from horizon with IMU control"

     

  • Lew Payne December 14, 2010 at 6:55am
    I have used the bluetooth version of that USB balloon. Makes it much easier.
  • Melih Karakelle December 14, 2010 at 5:59am

    @Michael:

    Good, i will contact with this company if my agent cant find them. Thanks.

     

    @Marco:

    I'm not sure about our ballooning freedom here, because they can find a hole in the rules anytime. I will start from pilot balloons (only a balloon plus a led light) and i will add some equipments every day. Any problem, i will send a mail from the jail ;)

    I released 3 balloon in 2 days but today cloud coverage is %100 and i'm waiting for clear weather. I will share the details on the diydrones and our blog (blog.flytron.com)

    Here is the our latest funny thing, it is first USB Balloon on the planet :)

    http://blog.flytron.com/usb-hydrogen-balloon.html

  • Michael Zaffuto December 14, 2010 at 5:00am

    @Lew: Supplier seems to have stock, email sales directly.

    http://www.szmjd.com/index_e.asp

    MINGJIADA (HK) INDUSTRIAL CO LTD
    B.22G Duhui 100 building zhonghang Rd.,Futian Shenzhen China
    Zip: 518031
    T: 0086-755-83957301
    F: 0086-755-83957753

     

    I would wait for Melih Karakelle to complete his design and buy

    finished product...much easier.

    系统提示
  • Melih Karakelle December 14, 2010 at 2:11am

    Yes GPRS is good choose in your case.

    About recovery:

    I'm designing a GPS guided micro glider (less than 100gr) and this is why i'm testing the equipments with balloons ;)

    After few tests, i will send an automatic glider that it will turn back to landing area.  Maybe OpenLRS can help to tracking the live datas.

  • Melih Karakelle December 14, 2010 at 12:36am
    I found it from a local supplier, i guess they are ordering them from asia. I will search for possible suppliers after test.
  • Lew Payne December 13, 2010 at 11:34pm
    Can you tell me who you found that actually stocks the RA07M4047M?
  • Melih Karakelle December 13, 2010 at 9:24am
    I have some keymont balloons but I will use punch balloons for this tests because 20gr lift is enough for that.

    GPRS+GPS looking expensive and useless for high altitude. Use APRS module and a gps chip for perfect tracking. APRS network covering all world and all CB amateurs helps you about tracking. And you can follow your ballon via google maps. APRS packages includes; Sender type(as balloon),Status,Position, Heading, Altitude, Info field for additional sensors. And you can find the APRS transmitter modules around 80-100$
  • Melih Karakelle December 13, 2010 at 5:50am

    I guess OpenLRS's 20db (100mw) telemetry module enough for %95 of applications. this 7W (39db) booster works only one directional. I'm designing booster Board for only knowhow and funny applications. I will release a disposable weather balloon  with OpenLRS + Booster + GPS and we will learn the range of whole system ;)

     

  • Alex Funi December 13, 2010 at 5:20am

    7 watt is too strong to be used legally in a lot of countries.  What kind of range are you shooting for?  Since video will always be the limiting factor range wise, I would think a 7W radio is a bit overkill.

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