The ESKY ET6I Remote Control is compatible to the Crazyflie as they share the same radio chipset. In order to use the RC instead of the Crazyflie PC Client, you'll have to compile the firmware with ESKYLINK support. You can do this in the VM, just open a terminal and issue the following commands:

cd ~/projects/crazyflie-firmware
make clean && make USE_ESKYLINK=1 CLOAD=1 all

This will create a new firmware file cflie.bin that you can flash to your Crazyflie via the Bootloader in the PC client.

You'll have to make some adjustments on your RC in order for this to work. First, take a look into the battery compartment of your RC. There you'll see two switches. Make sure switch 1 is set to on and switch 2 is set to off (this disables the channel mixing the RC normally applies in order to work with the helicopter models it came bundled with):

Then close the battery compartment again and take a look at the lower right front of your RC. There are four switches, one each for AILeron, ELEvator, THRottle and RUDder. You'll have to adjust these, depending on your RC's Mode. If you have a Mode 1 RC (throttle and rudder on the right stick) the correct setting is AIL-up, ELE-down, THR-up, RUD-down. If on the other hand you have a Mode 2 RC (throttle + rudder on the left stick) you'll need to set those switches to AIL-down, ELE-up, THR-down, RUD-up.

With this done and your Crazyflie reflashed with the ESKY-enabled firmware, startup your Crazyflie, then after the steady heartbeat from the red led indicates that it's done, make sure your throttle stick is all the way down and then switch on your RC. Crazyflie and RC should now bind and your Crazyflie should react to your RC's input.

Careful When your Crazyflie is flashed in ESKY mode, be careful to not switch on the RC when your Crazyflie is connected to the USB cable for charging. It will bind to the RC and it will react to any (accidental) RC commands you give it, including trying to fly away with the USB cable still attached.

If you want a bit more pep to your RC controlled Crazyflie¹⁾ you might want to take a look at the adjustments ''jodell'' made and use his repository version to compile your firmware instead. If you do this make sure to trim your throttle channel all the way down as otherwise your motors will spin even at the lowest setting.

Here is a precompiled version from Surrender's fork: cflie_260613_eSky.bin Within this version there is also the startup sound added. The adjustments from “jodell's” fork are also commited into this precompiled version.