Multiple flight modes for Cleanflight with Taranis

FrSky X9D Plus Taranis is incredible radio. But also can be intimidation when migrating from simpler radios. Great example is mixing multiple switches into 1 channel to pass flight mode to flight controller. Yes, you can do it, but it can be pain in the ass on a Mixer level. I’ve lost a lot of time trying to understand logic behind mixer weight and offset only to discover possibility to replace channel value, not add. And everything was simple again. So, here what I wanted, and what I did.

What I wanted

When I fly bigger FPV quadcopter, I want to use 7 different flight modes:

  • Angle without Altitude Hold (no BARO),
  • Horizon without Altitude Hold (no BARO),
  • Acro/Rate without Altitude Hold,
  • Angle with Altitude Hold (BARO),
  • Horizon with Altitude Hold (BARO),
  • Position Hold with Altitude Hold (BARO),
  • Return To Home with Altitude Hold (BARO)

And I’ve figured out, that 3 switches should be used to enable all the flight modes: SC, SD and SG. SC toggles Angle/Horizon/Acro. SD switches PosHold and RTH (as well as BARO and overrides SC and SG). SG enables Altitude Hold but only when SC is in up or middle position. 3 switches, 7 modes. I could do it with 3 radio channels, but that would have few flaws: would use 3 channels instead of one, and would allow for mistakes like no BARO with POSHOLD. So, advanced mixes and logical switches that is.

SC SD SG Flight Mode Altitude Hold GPS Logical Switch
Up Up Up Angle Off Off L1
Middle Up Up Horizon Off Off L2
Down Up Acro Off Off L3
Up Up Middle Angle BARO Off L6
Midle Up Middle Horizon BARO Off L7
Middle Angle BARO Position Hold L4
Down Angle BARO Return To Home L5

Solution

Solution in Taranis OpenTX requires 2 things: logical switches and mixer setting for CH5. For this example, Logical Switches goes as follows:

taranis logical switches

And mixer setting for CH5 is like that:

flight modes taranis mixer

Mixer setting

Each CH5 mixer entry uses Source MAX with weight 100 and is activated on Logical Switch (L1-L7). Channel output is determined by Offset value. Important setting is Multiplex: REPLACE, not ADD. And that is all. 7 flight modes, 3 switches, 1 radio channel. What is left to activate correct modes in Cleanflight based on CH5 (AUX1) value.

One thought on “Multiple flight modes for Cleanflight with Taranis

  1. Thanks! This saved me a lot of effort trying to squese arming, beeping, flight mode switching and failsafe activation into 6ch RX

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