How to Setup Switches in OpenTX Mixer/Inputs (Taranis, Nirvana, T16)

In order to activate flight modes and features in Betaflight you need to setup the switches in your radio first. I will show you how to do it in OpenTX which is the same system used in the Frsky Taranis X9D, QX7, Horus X10, X-Lite, and Flysky Nirvana.

How Many Switches Can You Setup?

I know there might be a lot of switches available on a radio transmitter, you might not be able to use all of them due to the limited channels. You have to choose which ones you want to use.

Because we use 4 channels for basic controls like Throttle, Yaw, Roll and Pitch, only the rest of the channels can be used for switches. These are called auxiliary channels or AUX channels. Each switch will take up a channel.

There are 8 channels in PPM, so you can have at most 4 AUX channels. For SBUS that’s 16 so you can have maximum 12 AUX channels.

How Many Switches Do You Need?

You really don’t need that many switches. I normally only use 2 to 3 switches at most on a mini quad because there really aren’t too many things I need to control.

For example, I need a switch to arm the quad, another one to activate the buzzer when we lose it in the bushes. Perhaps another one to switch to Angle or Horizon mode.

How To Setup Switches in OpenTX?

It doesn’t matter if you are using PPM, SBUS or FPort, the process should be the same. I will show you how to configure one switch as an example.

All you have to do is to configure Mixer.

Mixer is used to assign inputs or sources to the channels, so you can send it to the receiver (and flight controller).

The first 4 channels are already occupied by throttle, roll, pitch and yaw, so we will have to use the next available channel, which is CH5 (Channel 5).

Scroll down to CH5, press the Enter key, it will take you to another screen.

In here, enter a name in “Mix Name”, you can enter anything you want. In this example I will just call it “ARM”, because that’s what I am going to use it for – arming the quadcopter.

In “Source”, pick the switch you want to use, in this case, switch “SD”. You don’t have to go through the list to find it, if you flip the desired switch, OpenTX will automatically select it for you. Pretty convenient huh?

No need to change any other setting, just leave them at default.

Missing Switches? If this is a new radio, there is a high chance they are not added to the system yet.

  • Enter “System Setup” (Long press the MENU button)
  • Go to the HARDWARE tab (press the PAGE button)
  • Scroll down to “Switches” and change “none” to “toggle/2pos/3pos”

Repeat the same for other switches you want to setup, in my case, I created 3 more switches for “Mode”, “Beeper”, and “Free” (my spare switch just in case). This is my usual setup, I normally only use 8 channels – because for SBUS, using 8 channels has less latency than using 16.

If you also decide to use 8 channels like me, you have to change “Channel Range” to “CH1-8” in order to take advantage of the reduced latency. If you want to use 16 channels, then select “CH1-16” there :)

Switch is configured successfully!

Double check that the switches are working. Check in the Betaflight Receiver tab that the AUX channels are responding correctly when you flip those switches, AUX 1 is CH5, AUX 2 is CH6 and so on…

If it is then you can move on to setting up Betaflight modes tab :)

Edit History

  • Sep 2018 – tutorial created
  • Sep 2019 – updated (removed input setup, no need for switches)

12 thoughts on “How to Setup Switches in OpenTX Mixer/Inputs (Taranis, Nirvana, T16)

  1. balazs

    @Viktor Alvarsson, @Hunt I have the solution. Long press menu->press 5x page (hardware screen)->go down to switches and change “none” to toggle/2pos/3pos.

    Reply
  2. Viktor Alvarsson

    @Hunt Im having the same issue. When choosing source only S1 and S2 show up. None of the SA through SE lettered switches show up. Did you solve this issue? Any guidance?

    Reply
  3. Hunt

    hi oscar i have got my new tarnis plus when i go to input and on channel 5 there is switch option when i go there i only see maximum 2 switches se and s2 rest of the switches wont appear there what im doing wrong or is the any fault im worried im using it internal d8 protocol and another crossfire with 85x 4k whoop kindly tell me what do i do to get all my switches and be assure that the taranis plus is fine.

    Reply
    1. Oscar Post author

      Probably not added to the system. Go to system setup (long press Menu), go to the hardware tab, scroll down to switches and change none to 2pos or 3pos

      Reply
  4. Rob

    Hi I managed to screw up the configuration on my Taranis X9D plus. I was hoping this forum could provide some guidance.

    The taranis is bound to the drone, however I cant for some reason start the drone. I reviewed your list above and that seems fine, however the drone doesn’t kick in the motors when using throttle. When I switch the drone off, the controller says lost telemetry so i believe it has bound correctly. Any ideas ?

    Reply
  5. .AleX.

    Another way to do it is to create a mixer with input source ‘MAX’, with the desired value in ‘gain’ (-100 = 1500µs and +100 = 2000µs).

    Then, with physical or logical switch, you can active the mixer or not, changing the output value with it.
    You can also use more than on mixer for each channel, to get for exemple 3 different values depending of the switch selection.

    Reply

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