The image below shows how you should solder the wiring. The Gnd (ground), IO2, OW (deck single wire memory), and VCOM (power supply). Please check out this page to familiarize yourself with the pin-outs of the expansion decks.

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Please pay attention to that the orientation of the LED deck is now different. We put the battery holder on the side to prevent any connections to short with the LED deck, but now you would need to indicate the new ‘front’ of the LED deck. On the bottom left picture we show it with a sticker.

We tested the converted LED deck with the Flow deck V2  with the CFclient and we are still receiving the values and parameters from both the deck drivers.

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The final step is to modify the firmware. The GPIO pins used by a deck are registered in the deck driver to enable the system to detect conflicts. As the LED-ring is not using IO3 in this configuration, it should be removed from the deck driver to enable it to be used with the Flow deck (that is using IO3). Open the ledring12.c file and modify this line in the deck driver by removing | DECK_USING_IO_3. Re-compile the firmware and flash it to the Crazyflie (see the Getting started with development).

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The battery holder deck can be glued on the LED-deck or attached with some tape. The wiring and soldering are done a bit crude for now to clearly show how to do this, however if you would like the wiring not to be shown as clearly as it is here, this should be easy to fix with thinner wires and basic soldering skills. =)

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What we are essentially doing, is that we are flipping the pin-layout of the LED deck so that it is compatible to be put on the top of the Crazyflie.

We did not connect IO3 on purpose since the Flow deck v2 is already using this, or else the LED deck and Flow deck V2  will conflict with each other’s communication with the Crazyflie. However, the LED deck should work as well without the IO3 connected.

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Light up the dark with custom patterns using the Crazyflie 2.x LED-ring expansion board. Featuring 12 strong RGB LEDs facing downwards, you can create custom patterns in firmware that you control from your computer. Two additional strong front facing LEDs that can be switched on and off, act as headlights.

One of the most frequent questions I get concerns the purchase of a new zoom lens and whether I’d recommend a maximum aperture of f/2.8 versus f/4. Many manufacturers....