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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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Walkera quadcopter firmware hacking

Wednesday, March 25, 2015

Walkera produces realy fine and popular quadcopters. They are targeted to people who want to have fun flying. Just buy one of these RTF (ready to fly, no assembly or soldering required) models and start. That’s perfectly OK. But for me I always want to know whats going on inside a device. Especially a quadcopter. I own a few models and also some Walkera ones. A Hoten-X and a Ladybird. After analyzing the firmware update process of the Walkera Devo-7 transmitter and the Hoten-X (RX2635H) and Ladybird (RX2634H) receivers in another post, I now analyzed the receiver and its firmware.

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Walkera X-Z-18 internals

Tuesday, December 30, 2014

The Walkera X-Z-18 camera is a very cheap and simple flight recording camera. It is intended for usage with Walkera’s Hoten-X or Ladybird quadcopters but it can also be used with other copters.
See this post for how to install and use it.

I’m always interested in how thing’s work so the following post describes some internals of the X-Z-18 camera.

Click on a picture for a larger view

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