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Thread: Ground station MkII (with Arduino)

  1. #1
    Pilot boopidoo's Avatar
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    Ground station MkII (with Arduino)

    Now it's time to make another GS which will have the following:

    • Room for my Futaba 12FG with TSLRS
    • Room for my goggles
    • Screen (Haier 10")
    • Rangevideo GS
    • 20x4 LCD display
    • Arduino UNO R3
    • USB-A connectors to recharge gopro etc
    • USB-B to communicate with the Arduino
    • 2x Rangevideo 1.3 Deluxe VRx med RSSI
    • 1.3GHz CP omni
    • 1.3GHz CP crosshair
    • Lawmate PV500 DVR
    • 3S battery ca 4-8Ah
    • 4x AV-outputs, both XS9JK and RCA (to screen, goggles, DVR and a spare)
    • 2x AV-inputs, both XS9JK and RCA (from VRx)

    The project is divided in two main parts, the mechanical design and the arduino programming. I'm a total novice regarding Arduino so it'll be fun.


    Mechanical
    This case (LARGE) is quite rugged and will hopefully fit everything: http://www.clasohlson.com/se/V%C3%A4ska/Pr314142000

    The interior of the case will have aluminium frame for the battery, RVGS and panel with all the switches and electronics.

    By now I have modeled the case I'll be using (see picture) and next I'll model the frame and panel and decide the layout of connectors and switches etc.

    Click image for larger version. 

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    Arduino
    The Arduino part of this project will be:
    • Monitor battery voltage
    • Monitor regulated 12V voltage
    • Monitor Regulated 5V voltage
    • Monitor RSSI from both VRX
    • Alarm (sound and light) when the battery voltage is under 3.3V for 2S and 3S batteries
    • Timer with reset

    I have made the code and tested it and it should work without any major revisions. See picture of it working when connected to a breadboard.

    Next I'll design a shield with connectors for all inputs and switches/pots that is needed. I have made a rough sketch using Fritzing and will try to make a PCB layout from this.

    Click image for larger version. 

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    Last edited by boopidoo; 10th January 2013 at 05:47 AM.

  2. #2
    Pilot MatCat's Avatar
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    Interesting, I love to see people putting AVR's into things I too am working on an Atmel powered GS, I already have it handling diversity, RSSI info, soon to be handling telemetry and other things too. I can't wait to see how it turns out .


  3. #3
    Pilot boopidoo's Avatar
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    Now there's some pictures!

    I'm a bit worried that I've created some ground loops since I both measure the voltage that powers the VRXs as well as connecting ground when measuring RSSI. Should I remove the ground wire from the RSSI connectors?

  4. #4
    Pilot MatCat's Avatar
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    Assuming everything is running off of a single power source you don't need ground for RSSI.

  5. #5
    Pilot boopidoo's Avatar
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    Ugh! I'm trying to route components on a PCB using Fritzing but I find it kind of hard, it sure is a kind of a puzzle to make everything work. If someone would like to have a look at it please be my guest.
    BGS-shield.zip
    Last edited by boopidoo; 10th January 2013 at 10:36 AM.

  6. #6
    Pilot MatCat's Avatar
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    I would check it out but I dont use fritzing, I use eagle.

  7. #7
    crash test dummy fpvnoob's Avatar
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    Quote Originally Posted by MatCat View Post
    I would check it out but I dont use fritzing, I use eagle.

    If you're scared sit in the truck and don't play with the knobs,now hold my beer and watch this sh*t!!

  8. #8
    Pilot boopidoo's Avatar
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    Removing the ground on the RSSI inputs also renders those two caps unesseccary making it a little easier I guess.

    I guess I should check eagle out. I am a mechanical engineer so electronics as magic AFAIK but maybe I can get lucky and actually make something work.

  9. #9
    Pilot MatCat's Avatar
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    When I decided to actually get into electronics I read a few books, one of the better ones was Make Electronics: http://shop.oreilly.com/product/9780596153755.do, that book gave me a fantastic foundation.

  10. #10
    Pilot boopidoo's Avatar
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    I think that for starters I might not make a printed PCB and use my proto shield instead. I'll have to route using metal wire instead of copper traces but it will work. My proto shield have some extra ground and +5V which will make the design a little easier.

    Click image for larger version. 

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    http://www.ebay.com/itm/180966726545...84.m1497.l2649

    Plus the Arduino UNO R3 has a really annoying design feature where the digital pins are not all placed on 2.54mm spacing, this makes it harder to fit standard mount plates... really annoying.

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