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Autonomous UAV w/Mavlink

Design and development of a small UAV, primarily to test autonomous capabilities, and Mavlink feasibility.

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This is an ongoing project. The title says most of the story. This UAV will be around 5 feet in wingspan. It will have a Matek f405 flight controller running arduplane and communicating through a tbs crossfire radio.

This project is made possible with the help of the University of Minnesota Taylor Project Fund.

Some details on the project: 

- Matek f405-WING running arduplane

- Using a 3018-14T brushless motor with an Aeronaut folding prop from a commercial UAV

- Planned completion by Spring 2022

- More details to come as it gets designed and built

  • 1 × Matek f405-WING Flight controller
  • 1 × Crossfire Diversity Nano Receiver Aircraft Receiver
  • 1 × M8N GPS For positioning
  • 1 × Mach 3 VTX for FPV
  • 4 × 13g servos

View all 7 components

  • Update 11/28

    nniziolek11/29/2021 at 01:13 0 comments

    TLDR: 

    1. Got all radio components

    2. Settled on final airframe design

    Details: 

    1. Working on implementation of the CRSF nano to my F405WING FC. UART1 didn't work but after some reading it seems that the move is to go with UART2, and run RC by Mavlink on the CRSF receiver. 


    2. settled on high-wing airframe. Seems easier to make, and much more slicked out for being a bigger airframe than the Talon. Only thing is that I will need a carbon rod or two. 

  • Crossfire Radio and HAM Licensing

    nniziolek11/17/2021 at 16:24 1 comment

    Recently, I received the first part for this project, a Crossfire radio system (thank you ECE depot at the U of M!). This is a long range radio link with up and down telemetry. This radio, unlike normal RC links (2.4GHz), operates on 900MHz (@ up to 2W, but that isn't legal even with a license). This band is classified as UHF. To operate in this band, you need an amateur radio license, specifically a technician class license. 

    Getting a HAM License is not the easiest, but definitely not the hardest. There is a ton of study materials out there. One of the ones I've liked so far is this one:

    https://www.kb6nu.com/wp-content/uploads/2018/11/2018-no-nonsense-tech-study-guide-v1-1.pdf 

    Fairly straightforward language with plenty of sample questions in it. Another great place for finding questions is here: 

    https://hamstudy.org/tech2018

    This has the actual bank of test questions. 

    I personally have not taken the test yet, but I plan to in about a week or two. Until then, I will be starting airframe design, based on the Talon style frame.

  • Initial Research

    nniziolek11/15/2021 at 17:02 0 comments

    This is the start of the project, and thus the start of the research phase. The first step here is to do a high level summary of this project. 

    What are the needs of this project?

    • Flight Capable UAV
    • Autonomous
    • Telemetry link throughout flight

    What are the wants of this project?

    • Long flight time (30-45 minutes)
    • Able to be broken down for easier transport
    • Full FPV/camera integration

    This gives a good idea of what has to happen. The next big step is deciding the UAV design. A good place to start is where I am familiar. While thinking of this, there are three main ideas that come to mind. 

    The first idea here is a "Talon" style UAV. This is a widely popular design in the world of small UAVs. It features a motor mounted on the tail, high wings, and a V-tail. 

    Pros: 

    • Already well known for being a good UAV design
    • Fairly compact
    • no long carbon rod based tails

    Cons: 

    • Not as familiar with tail mounted engines
    • Seems difficult to balance

    The second idea is a "twin-boom" style plane. These are popular with slightly larger UAVs, and are characterized by two "booms" going out to the tail. 

    Pros: 

    • Easier to balance, can be done by adjusting tail length. 
    • Either dual rudder or inverted V-tail
    • Easy to scale

    Cons: 

    • Large carbon booms can be expensive
    • Almost necessary to have landing gear
    • harder to teardown

    The final is a "high-wing" style plane. This is possibly the closest to a traditional aircraft. Features a motor facing backwards on a raised mount and a long boom tail. Can be either a T tail, V tail, or a standard tail. 

    Pros: 

    • Easy to balance
    • Fairly simple

    Cons: 

    • Long carbon boom tail
    • Tail can be hard to support well

    These are the options so far. I am partial to the Talon style right now, just for its lack of large carbon supports and its compactness. I plan to make a final airframe decision this week, and get the design started. I will update this log once I have an initial model either in Fusion 360 or SimplePlanes (which by the way I recommend for some rapid prototyping for aircraft).

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