The devil is in the details
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.
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.
This post describes building a compact system based on a Raspberry PI inside a power plug much like the DreamPlug or others.
Managing and controlling things with a Rasperry Pi is common these days. The only problem in most situations is finding a suitable case. It shuld be compact, containing all necessarry parts and easy to modify. The Rasperry PI is not very suitable for installing it in standard cases due to it’s connectors. So there are lots of specialized cased from plastic or wood or metal. This situation has changed a little with the second generation of the PI but it is still not so easy to find the right case for a PI project.
The following text describs a way of installing a Raspberry PI including a power supply and extension board in one compact plug case.
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If you are using one of FitBit’s fitness tracker devices like the ‘One’ for some time you create a lot of data. When you synchronize your tracker all recorded data is sent to FitBit’s servers. The FitBit portal provides some features for graphically displaying and analyzing your data. It’s also possible to export it manually as CSV to process it further. But what if you want your data locally available without manual export to make own statistics. This is what the ‘fitbit_dumper’ is for.
Update: Since 2016 FitBit uses OAuth2. See this blog post for an update.
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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