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This is an old revision of the document!
This is where we try to collect the most frequently asked questions and answers to them.
The Crazyflie is controlled with the Crazyradio. It uses the nRF24L01+ 2.4 GHz chip from Nordic Semiconductors which is commonly used in commercial HID devices. We chose this chip because it is low power, low latency, decent range, easy to work with and relatively cheap.
As with all radio communication it depends. It depends on the environment, radio interference, chip production variations, etc. In a couple of line-of-sight tests outdoor we have gotten from 50 to 80 meters range in the 250 Kbit mode, higher data rate decreases the range.
The Crazyradio has been designed to work as a radio dongle connected to a USB port but has other capabilities.
The e-sky R/C transmitters use the nRF24L01 chip, compatible with ours, so it would be possible to control the Crazyflie using the e-sky transmitters. No firmware support for this yet but it is planned. Also see “Is a PC required for the Crazyradio”.
The Crazyflie is using the PCB itself as the frame. The PCB is made of FR4 which is a strong and lightweight material. We have tried to find a good thickness for the arms so that it is strong but also flexible. We want it to be flexible so that it bounces during a crash which will reduce the g-force chock imposed on the electronics. It has no problem handling low speed crashes but if you push it too it's limits and you fly 30 km/h into something hard you probably will damage it. Most of the parts can be replaced but if you are very unlucky you break one of the arms. We are working on 3D printed part that can be used to repair the arm in case of an accident such as this.