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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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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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Walkera RX2635H hello world firmware

Saturday, March 28, 2015

Based on the findings of previous posts I wrote a simple program using ATMEL’s AVR Studio and flashed it onto the Walkera Hoten-X RX2635H receiver. It’s very simple. Its the classic “hello world” program. As the receiver has only one LED to communicate with the outside world I used this LED as user interface. The program uses morse code to send the text “OK” by pulsing the LED. This results in the pulses - - - (long long long) - . - (long short long) for the characters O and K.

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After playing around with analyzing how the firmware update process for a Walkera Hoten-X receiver (RX2635H) works and how this firmware is secured with a simple encryption method it’s now time to analyze the receiver hardware. So that it meight be possible to develop a custom firmware for this receiver.

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