<p>Flight controllers usually have PPM <em>inputs</em>, not outputs. The PPM output is on your radio module.</p>
<p>You can indeed connect the PPM output signal to both the FC and your PPM-&gt;PWM converter: the FC would be controlling the motors, and the converter would be controlling the servo. There's nothing to configure in Betaflight in this case: the value from a certain channel will be applied directly to the servo.</p>
<p>A better idea is to configure Betaflight to control your servo: this avoids using the converter altogether, saving space, weight an money. If you have 1 or 2 servors to control, it's recommended to use <code>feature SERVO_TILT</code>, otherwise <code>CHANNEL_FORWARDING</code> is an option. <a href="https://github.com/betaflight/betaflight/wiki/Servos-&amp;-SERVO_TILT-for-3.1" rel="nofollow noreferrer">Here</a>'s the Betaflight documentation page with examples. Note that you need to assign resources (pins with timers) to servos before you can use them.</p>

CC BY-SA 4.0
2022-09-21T08:53:45.800Z
2022-09-21T08:53:45.800Z
Dmitry Grigoryev
<p>I have a quadcopter on which I want to connect a servo, I bought a ppm to multiple PWM converter to connect on the flight controller PPM output, but I don't find how to tell betaflight to control the servo through the converter.</p>
<p>I tried to configure the servo in the servo tab but it does nothing.</p>

CC BY-SA 4.0
2021-08-17T16:14:17.367Z
Why are you using a PPM to PWM converter? The "ppm" on the board is an input (unless remapped with resource mapping) and betaflight/inav do not output PPM. You want to connect your servo to a "motor" output and look into the servo mappings to those motor outputs
Brydon Gibson
CC BY-SA 4.0
2021-08-18T06:12:59.483Z
@BrydonGibson Ok, I understand better know, I think I can't do that with this FC even if there's several pins that are physically available there's no documentation. Thanks
Entretoize
CC BY-SA 4.0
2021-08-18T14:14:51.570Z
Look into the "resource" CLI command in betaflight. You can use it to figure out mappings based on what the target developer has decided for this board. Effectively, it _is_ the documentation
Brydon Gibson
<quadcopters><flight-controller><betaflight>
Control a servo through the flight controller PPM output and a ppm to pwm card
Entretoize
# Control a servo through the flight controller PPM output and a ppm to pwm card

(Asked by: username_0 on 2021-08-17)

I have a quadcopter on which I want to connect a servo, I bought a ppm to multiple PWM converter to connect on the flight controller PPM output, but I don't find how to tell betaflight to control the servo through the converter.

I tried to configure the servo in the servo tab but it does nothing.

**Tags:** quadcopters, flight-controller, betaflight
> **Comments:**
> **username_1**: Why are you using a PPM to PWM converter? The "ppm" on the board is an input (unless remapped with resource mapping) and betaflight/inav do not output PPM. You want to connect your servo to a "motor" output and look into the servo mappings to those motor outputs  
> **username_0**: @BrydonGibson Ok, I understand better know, I think I can't do that with this FC even if there's several pins that are physically available there's no documentation. Thanks  
> **username_1**: Look into the "resource" CLI command in betaflight. You can use it to figure out mappings based on what the target developer has decided for this board. Effectively, it _is_ the documentation  

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## 1 answers

### Answer by username_2 on 2022-09-21. Score: 1

Flight controllers usually have PPM *inputs*, not outputs. The PPM output is on your radio module.

You can indeed connect the PPM output signal to both the FC and your PPM->PWM converter: the FC would be controlling the motors, and the converter would be controlling the servo. There's nothing to configure in Betaflight in this case: the value from a certain channel will be applied directly to the servo.

A better idea is to configure Betaflight to control your servo: this avoids using the converter altogether, saving space, weight an money. If you have 1 or 2 servors to control, it's recommended to use `feature SERVO_TILT`, otherwise `CHANNEL_FORWARDING` is an option. [Here](https://github.com/betaflight/betaflight/wiki/Servos-&-SERVO_TILT-for-3.1)'s the Betaflight documentation page with examples. Note that you need to assign resources (pins with timers) to servos before you can use them.


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