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Sep 18, 2018, 05:13 PM
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Control Mini Convergence VTOL with Futaba TX

I tried to control Mini Convergence VTOL with Futaba transmitter.

Control E-flite Mini Convergence VTOL with Futaba TX (0 min 16 sec)

MCV supports only Spektrum serial reciever(SPM4648), so I needed to simulate Spektrum serial.
Spektrum serial is 125000bps, 8bits, No parity and 1 stop bit. SPM4648 sends 16byte packet every 22ms.
The first picture is the actual output of SPM4648. Each line is 16 byte packet every 22ms.

00 a2 0c 00 2e aa 14 0c 1b ff 01 5e 21 56 31 56

00 fade count
a2 system id (DSMS Spektrum2048 22ms)
0c 00 Channel ID=1 (Aileron) Servo Position=1024
2e aa Channel ID=5 (AUX 1) Servo Position=1706
14 0c Channel ID=2 (Elevator) Servo Position=1036
1b ff Channel ID =3 (Rudder) Servo Position=1023
01 5e Channel ID=0 (Throttle) Servo Position=350
21 56 Channel ID=4 (Gear) Servo Position=342
31 56 Channel ID=6 (AUX 2) Servo Position=342

If we simulate these packets from SBUS data, we can fly MCV with Futaba TX.

The channel ID of Spektrum is numbered in the order of Throttle, Aileron, Elevator, Rudder, Gear,... ,but Futaba's ID is in the order of Aileron, Elevator, Throttle, Rudder, Gear,... We also need to convert them.

At first I thought about converting SBUS to Spektrum with Arduino or Mbed, but since I found "SBUS to PPM or Spektrum Serial Converter" (the second picture) on the internet, I decided to use it. It seems to be a clone board of sebseb7's really nice project.( (Don't ask him about the clone board).
I modified the firmware of the converter slightly to match the output of SPM4648.

The voltage of MCV's receiver connector is 3.3 V, so I took 5V from unused servo connector
of the MCV to power the converter and the SBUS receiver. The signal from the converter is
level-shifted and input to MCV. The third picture shows the connection of the converter, SBUS receiver and MCV.
I don't guarantee anything and am not sure you're interested in but I attached the modified firmware I used.
Last edited by aero nishi; Oct 21, 2018 at 01:13 AM.
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