Some time ago I wrote a blog post about exporting FitBit fitness data into a Sqlite3 database or exporting it as a CSV file for further processing. This was done using a simple Node.js javascript script called “fitbit_dumper”. The original dumper used OAuth version 1 to access the FitBit API.
Since 2016 the FitBit API is only accessible using OAuth2. So this post describes the differences to the original post.
[Read More…]
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.
[Read More…]
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
[Read More…]
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.
[Read More…]
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.
[Read More…]
rss
atom