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60 lines
2.2 KiB
Markdown
60 lines
2.2 KiB
Markdown
# Connecting an RC Receiver to a PX4 Linux-based Autopilot
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This topic shows how to setup a PX4 Linux-based autopilot to connect and use a [supported RC receiver](../getting_started/rc_transmitter_receiver.md) on any serial port.
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For RC types other than S.Bus, you can just connect the receiver directly to the serial ports, or to USB via a USB to TTY serial cable (e.g. like PL2302 USB to Serial TTL converter).
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::: info
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For an S.Bus receiver (or encoder - e.g. from Futaba, RadioLink, etc.) you will usually need to connect the receiver and device via a [signal inverter circuit](#signal_inverter_circuit), but otherwise the setup is the same.
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:::
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Then [Start the PX4 RC Driver](#start_driver) on the device, as shown below.
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## Starting the Driver {#start_driver}
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To start the RC driver on a particular UART (e.g. in this case `/dev/ttyS2`):
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```sh
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rc_input start -d /dev/ttyS2
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```
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For other driver usage information see: [rc_input](../modules/modules_driver_radio_control.md#rc-input).
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## Signal Inverter Circuit (S.Bus only) {#signal_inverter_circuit}
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S.Bus is an _inverted_ UART communication signal.
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While some serial ports/flight controllers can read an inverted UART signal, most require a signal inverter circuit between the receiver and serial port to un-invert the signal.
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:::tip
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This circuit is also required to read S.Bus remote control signals through the serial port or USB-to-TTY serial converter.
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:::
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This section shows how to create an appropriate circuit.
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### Required Components
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- 1x NPN transistor (e.g. NPN S9014 TO92)
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- 1x 10K resistor
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- 1x 1K resistor
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::: info
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Any type/model of transistor can be used because the current drain is very low.
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:::
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### Circuit Diagram/Connections
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Connect the components as described below (and shown in the circuit diagram):
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- S.Bus signal → 1K resistor → NPN transistor base
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- NPN transistor emit → GND
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- 3.3VCC → 10K resistor → NPN transistor collection → USB-to-TTY rxd
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- 5.0VCC → S.Bus VCC
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- GND → S.Bus GND
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The image below shows the connections on a breadboard.
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