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Walkera RX2635H as generic development board?

Wednesday, December 30, 2015

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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node.js based LoST (RFC 5222) server

Friday, December 18, 2015

lost-head.jpg Sometimes you need a component for a project or some tests and there is no or at least no free implementation available. This happens to me when I wanted to translate a geographically position (lat/lon) into a corresponding service URN. RFC 5222 provides more information on that. After reading the RFC which looked not that complicated I decided to implement such a server myself. The goal was also that it should be lightweigt, easy to develop and to deploy into the cloud. So it was obvious to me that node.js and mongodb will be used.
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Walkera UP02 software clone: UP42

Monday, June 22, 2015

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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RX2635H using the ITG-3205 mems gyro

Sunday, April 12, 2015

ITG3205_axis.png 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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Now that it’s possible to write custom firmware for a Walkera Hoten-X RX2635H-D receiver it’s time to try to access the various components on the ATMEL XMEGA32A4 based receiver board. First thing was to blink a LED which was quite simple. But for easier development there must first be a more user friendly way interact with the board. Fortunately there is a serial port available. It is normally used to upload new firmware and as additional channel for controlling e.g. a camera in the original Walkera firmware.

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