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43 lines
1.8 KiB
Markdown
43 lines
1.8 KiB
Markdown
# Connecting Raspberry Pi to the flight controller
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In order to program [autonomous flights](simple_offboard.md), [work with Pixhawk or Pixracer over Wi-Fi](gcs_bridge.md), use [controller app](rc.md) and access other functions you need to connect your Raspberry Pi to the flight controller.
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## USB connection
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USB connection is the preferred way to connect to the flight controller.
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1. Connect your FCU to the Raspberry Pi using a microUSB to USB cable.
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2. [Connect to the Raspberry Pi over SSH](ssh.md).
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3. Make sure the connection is working by [running the following command on the Raspberry Pi](ssh.md):
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```bash
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rostopic echo /mavros/state
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```
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The `connected` field should have the `True` value.s
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> **Hint** You need to set the `CBRK_USB_CHK` [parameter](parameters.md) to 197848 for the USB connection to work.
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## UART connection
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<!-- TODO: Connection scheme -->
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UART connection is another way for the Raspberry Pi and FCU to communicate.
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1. Connect the TELEM 2 port on the flight controller using a UART cable to the Raspberry Pi pins following this instruction: the black cable (*GND*) to Ground, the green cable (*UART_RX*) to *GPIO14*, the yellow cable (*UART_TX*) to *GPIO15*. Do not connect the red cable (*5V*).
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2. Set the PX4 parameters: `MAV_1_CONFIG` to TELEM 2, `SER_TEL2_BAUND` to 921600 8N1. In PX4 of version prior to v1.10.0 the parameter `SYS_COMPANION` should be set to 921600.
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3. [Connect to the Raspberry Pi over SSH](ssh.md).
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4. Change the connection type in `~/catkin_ws/src/clover/clover/launch/clover.launch` to UART:
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```xml
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<arg name="fcu_conn" default="uart"/>
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```
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Be sure to restart the `clover` service after editing the .launch file:
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```bash
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sudo systemctl restart clover
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```
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**Next**: [Using QGroundControl over Wi-Fi](gcs_bridge.md)
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