Arduino Radio Transceiver

Discussion in 'Rocketry Electronics and Software' started by Clarky, Oct 4, 2019.

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  1. Oct 4, 2019 #1

    Clarky

    Clarky

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    Hi,
    I am wanting to transmit GPS coordinates and altitude from an Arduino onboard a model rocket that will go 1km high, to another Arduino on the ground. The purpose is just to assist in finding the rocket once it lands. I was needing something cheap but also not too large (about 3-4cm). I was looking at LoRa modules but they seem a bit overkill, I also looked into HC12's but am not sure if they would suit the task. What pair of transceivers will do this job best?. I posted this in the Arduino forums https://forum.arduino.cc/index.php?topic=638749.0 as well if you need further info.
    Thanks for any help,
    Jayden
     
  2. Oct 4, 2019 #2

    cerving

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    Welcome to the Forum! For a 1km link, a pair of 3DR radios will work fine... you can pick them up for under $40. Be sure to get the ones that are compliant with your local RF regulatory body (I'm guessing that you're not in the US, since you used the metric system...)
     
  3. Oct 4, 2019 #3

    Clarky

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    Thanks for the reply. That's exactly what I needed thanks a lot!
     
  4. Oct 7, 2019 #4

    Clarky

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    I've found this telemetry system https://www.banggood.com/3DR-Radio-...M2-p-73539.html?rmmds=search&cur_warehouse=CN
    Will this work fine?? Yet again I looked into LoRa modules and found a setup for cheap that was proven to work at over 3km. Will LoRa still work well? I like the 3DR systems because of their simplicity but I don't want to go getting a system that isn't going to work. Thanks
     
  5. Oct 7, 2019 #5

    OverTheTop

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    Be careful with the 3Dr radios. Don't use high power if you don't need it. It can interfere with gps receivers and other electronics nearby. That's what I found when I cranked one of the modules to 100mW.

    [Edit] I think it was 500mW I had trouble with. The lower power was fine.
     
    Last edited: Oct 7, 2019
  6. Oct 7, 2019 #6

    Clarky

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    Will do, I plan on doing many ground tests and doing a test with the system on my drone. If there are any alternative, cheap solutions please do let me know. Thanks
     
  7. Oct 7, 2019 #7

    jderimig

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    ^This. The cheap Chinese 3DR's are spread spectrum, and not in a good way.....
     
  8. Oct 7, 2019 #8

    Clarky

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    Is there any way to get around this? What other systems could I use? Maybe the LoRa modules might be better off but they still output 100mW. I have read a bit about the Eggtimer system, but how come that does not interfere with GPS? or does it? Thanks for any help.
     
  9. Oct 7, 2019 #9

    Clarky

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    Oh ok, that's reassuring! Where did you get your radios?
     
  10. Oct 7, 2019 #10

    OverTheTop

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    Banggood.

    Just be careful with antenna placement. Distance between antennas is your friend. Receiver desensitisation can happen whether you have cheap or expensive hardware. It basically comes down to the higher field strength causing problems.
     
  11. Oct 7, 2019 #11

    Clarky

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    Great, I think ill get the one I linked then, thanks for your help.
     

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