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The flight controller implements a number of critical low-level behaviors. StatuscolourRedtitleTODO(FC) implements several low-level behaviors, e.g., stabilizing the Duckiedrone around roll, pitch, and yaw through three different PID controllers. Correctly configuring the FC is critical for flying safely.

Installing Cleanflight Configurator (CFC)

Cleanflight configurator is an app that allows the base station to connect directly to the FC and access its configuration interface.

Steps:

• Install Google Chrome

• Install the Cleanflight Configurator for Chrome

• Start CFC on your base station. You should see the below interface.

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Connecting to the Flight Controller (FC)

1. Unplug the battery from your drone

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      double-check the battery is unplugged

2. Disconnect the Raspberry Pi from the FC

3. Connect the mini USB cable from your FC to your base station

4. In CFC (see last section), on the top right corner

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   1. select the correct connection port

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        Details might vary depending on available connections on your base station. The correct port should start with: /dev/tty.usbserial* /dev/cu.usbserial* or /dev/ttyUSB*

   2. Leave the baud rate (number) at the

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      value of 115200

5. Press the “Connect” button and a “Setup” page should greet you with a rendering of your drone (see figure below). Before configuring anything, please read the next section and flash the firmware.

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Checking the existing firmware version

On the top left of the CFC interface, one could check for the Firmware version. For example, in the figure below, the firmware version of the FC is BTFL 3.3.3.

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Prepare for flashing the FC firmware

• If the CFC is still connected to the FC, please press the “Disconnect” button on the top right.

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• In the default Welcome page of CFC, in the left sidebar, please click on the Firmware Flasher tab

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• Configure the options in the tab as below:

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Updating the FC firmware (Flashing the FC)

FCs might have different versions of firmware (i.e., the software that runs on the FC’s micro-controller) out of the factory. Normally, this only needs to be done once initially. Follow this procedure to update your firmware.

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  During flashing, do not press the “Connect” button in CFC.

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  Our current target firmware is: BTFL 3.3.3 (Download the .hex file below to your base station)

Different FC versions

Version	Picture and key features to notice for this section
ACRO	There is a micro USB port soldered on the board (In the figure blow, on the bottom right of the board ) There is a “BOOT” button. Image Added
OSD	There is no micro USB port As highlighted, the Boot pins are exposed near the “BO”marking. Image Added

Flashing the FC

The videos to flash respectively the ACRO version and the OSD version of FCs are below in this section. A summary is provided here. Most operations are the same with both versions, and any version-wise operations are highlighted with

1. Normally, when connected to the base station, the FC goes in Normal mode

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      there is a red blinking LED

   2. unplug from base station

2. To flash the firmware, we would like the FC to be in Bootloader mode instead

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      For the ACRO version, hold the “BOOT” button while connecting the FC to base station

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         Once connected, one could release the boot button

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         there is no red blinking LED. On the ACRO version, there is a solid blue LED

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      For the OSD version, use some conductive metal tool to short the “Boot pins” (as highlighted in the previous section)

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         Once connected, once could take the pin-shorting material/tool away

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         there is no red blinking LED. On the OSD version, there is no LED on now.

3. In the CFC Firmware Flasher tab, click the Load Firmware [Local] button (bottom right), and select the .hex file downloaded at the beginning of this section.

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      The progress bar should look like “Loaded Local Firmware: (… bytes)”

4. Click the Flash Firmware button (bottom right) and check the progress bar.

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      The progress bar shows: “Flashing…” => “Verifying…” => “Programming SUCCESSFUL”

   2. In case the progress bar turns red, see the Troubleshooting section below

5. If successful, without needing to reconnect the cable, the FC should go back to the Normal mode.

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      Verify the red blinking LED is back on

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      Click “Connect” and verify the firmware version is correct

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Troubleshooting

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You now have the updated flight controller firmware! Connect to it in Normal mode and we will configure it next.