Richard J. Prinz

Finally after about two years of development the AMP (Advanced Mobility Protocolls) testbed developed for the European Space Agency (ESA) was delivered to its European Space Research and Technology Center (ESTEC) in Noordwijk, Netherlands.

AMP consists of a virtualization host, cisco switches, a JAR Network Emulator and some physical hosts and allows the simulation of various IPv6 mobility protocolls in a satellite context like PMIP, NEMO and MPTCP. It is completely self contained, remote controllable and can simulate even complex network layouts.

It was a pleasure to work on this project!

This post describes an easy and cheap way of adding a USB serial port to a Walkera RX2634H (QR Ladybird) or RX2635H (Hoten-X) RC quadcopter receiver board. This makes it very easy to update these controllers with new software (especially when using UP42)

The used USB to serial board uses a CP2102 from Silicon Labs. Such boards are cheap and easy available on platforms like ebay or amazon. The board is also very light (~2 gramms) so that it can be permanently installed on the receiver without impairing flight performance.

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Walkeras quadcopter brains RX2635H for the Hoten-X and RX2634H for the QR-Ladybird feature an Altera XMEGA32*A4U (which has quite some peripherals and memory) and sensors like gyros and even a wireless USB transmitter. You can get such a board either from an old crashed quadcopter or relatively cheap from the internet like ebay.

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UP42 - A Walkera UP02 Quadcopter firmware flasher clone

UP42 is a multi platform (Windows 32/64, Linux 32/64) command line utility with the following features:

• Walkera firmware en-/decryption
• Serial port DTR can be used to force receiver into boot loader mode
• Configurable profiles in simple ‘.ini’ file style config file
• fast

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One of the important parts of a quadcopter controller is a gyro. The RX2635H uses an ITG-3205 from INVENSENSE. Accessing it is very simple as it uses the I2C interface (Two Wire Interface - TWI on the XMEGA) to read the X, Y and Z values of the gyro.
 
 
 
 
 
 
 
 
 
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