Spoiler: I added a LemonRX DSMX sat to the scisky - but I’m not yet 100% happy.
I received a scisky today and after trying to bind it for a while I noticed that my transmitter does only (thanks to some EU regulations) support DSMX but not DSM2. There are various versions of the DX6i - mine is unfortunately DSMX only.
I planned adding a different receiver module to the scisky beforehand - now I’m left with no other choice. I strongly recommend not to try this, it involves cutting a little trace on the board - nevertheless the changes are reversible if you are careful and know what you are doing.
Tools (if you lack any of the first four, please don’t even try):
- proper soldering equipment
- desoldering braid (I used a 1,5mm type)
- a sharp knife
- something to clean flux residues (if your flux leaves some)
- magnifying glass (recommended - for inspection)
- other random tools like third hand, multimeter etc.
- a prebound (!!!) LemonRX DSMX satellite
You only need RX & V+ & GND to connect your sat to the scisky.
GND is really easy and V+ should be 3.3V for a spektrum satellite - the following two pads do the job (please excuse the picture quality, no better camera available):
Last but not least you need to find RX and disconnect it from the onboard receiver.
Remove any solder from the three pads. Cut the very tiny trace between the right and the middle pad - make sure these pads are disconnected. Cutting this trace defuses the onboard receiver (it will still flash like crazy) - you can revert this step by adding a little bit of solder to reconnecting the two pads. Last step: Solder your RX wire to the rightmost of the three pads. Done.
The software configuration part is left as an exercise for the interested reader
Problems with this approach:
- No binding possible without additional equipment
- The onboard receiver still flashes around - if you have a reversible way to cut the power from that part of the board, please let me know (removing the LED does not count ;)).
- The position of the pads I used is far from optimal - I only wanted to have a working prototype
The soldering isn’t too beautiful, please ignore that - its only for testing and will not be permanent.
Binding is of course possible via CLI from cleanflight - I just didn’t know the procedure to do this from CLI back then.