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tobi - 10/13/2024 9:39:28 AM

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norland - 10/12/2024 2:33:33 PM

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tobi - 10/11/2024 5:18:54 AM

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moefly - 9/22/2024 4:55:46 PM

All,

I was very excited when I read about the feature in the Skydemon release note, went right into ordering parts and figured I share the experience here.

Top 1 priority for me was to get the radio (f.u.n.k.e. ATR833-II) connected. So I designed a 3d case that perfectly fits on top of the original Sub-D connector housing and uses the existing screw holes (only needed slightly longer screws). Once mounted, it sits below the connector at the back of the radio and doesn't block anything else / basically uses the same space.

I decided to use a HM-18 BLE to serial module. It is very power efficient and therefore I could easily use the 5V the radio provides on the Sub-D connector. The HM-18 is outputting TTL serial, hence I added a MAX3232 converter to provide the proper RS232 levels the radio expects.

Put everything together and it worked right away. For me it's almost a killer feature in Skydemon as it makes my life so much more simple during flight.
A big thx to Tim and his team for adding this feature!

In case anyone is interested in the 3d model and a more detailed info on connection and parts I used, you can find all of that here on printables:
https://www.printables.com/model/1015550-funke-atr833-ble-rs232-case

Hi moefly,

according to HM-18 datasheet the power supply voltage is from 1.9V to 3.7V.

The ATR833 has 5V output.

Do you use a voltage converter or do you just run out of specs?

Regards,

Tobi

The same module is on Amazon uk for £12, it says Vcc is 3.6V to 6.0V.

You're right. Thanks for the response.

Even on DSD Tech homepage you'll find:

    Work voltage（VCC）: 3.6V to 6V

    TTL logic level (TX, RX): 3.3V

But on the linked datasheet you'll read:

    Power: +1.9~3.7 VDC 50mA

I'll just try it.

Thanks,

Tobi

TTL logic level (TX, RX): 3.3V