I have been reading a STM32 book from Prof. Geoffrey Brown. The book is part of a course from Indiana University when they have an introduction to the STM32 processor. The book is great and you can download it here: http://www.cs.indiana.edu/~geobrown/book.pdf
I pushed to my github some solutions for the purposed exercises, feel free to look at it correct it 
The project I talked in the first post is about controlling a quadcopter using a mobile phone. When I thought to build a quadcopter my first approach was to build all from scratch, software, control and electronics. During my research I found OpenPilot that is all what I was looking for and with a great community so I opted to use it and as soon as possible start to contribute to it.
Because I already had some knowledge in Qt I applied to Nokia N9 Devkit with the goal of controlling the CopterControl using the mobile phone, the project have been accepted.
I’m using RN174 (WiFi-Serial link) to connect the mobile to OpenPilot CopterControl (OPCC). You can see more information here. The serial baudrate is 115200 between RN174 and OPCC. I’m sending the packets using UDP at a 20ms rate. The RN174 have a PCB antenna and that is a weakness of course, will need to do a PCB with a SMA antenna. The following image ilustrates the connection between OPCC and RN.
I use the MainPort of OPCC to talk with the RN174 so it need to be used as Telemetry.
The UAVTalk object used in the project is the GCSReceiver that simulate a controller. Every 20ms the mobile phone update the values for throttle, roll, pitch, yaw and flight-mode in OPCC. To use the GCSReceiver object we need to set the RC Input type to GCS as you can see in the next image.
The application running on the mobile phone was developed in Qt. The layout of the joysticks are the same as GCS Control, the square area is equal to a real controller instead of the circle that I did before.
And the icon :p
In the following video you can see it working:
You can clone the project here https://github.com/metropt/OPMobile
I started to think in write a blog some time ago and now is a really good time to do it because I’m very happy with the project I’m developing. I’ll talk about it in the next post.
My interests are microcontrollers, usually I program Atmega but I’m starting look at STM32 too, want to learn more about embebed systems, robotics, mobile and desktop aplicaitons. I have medium knowledge in C/C++ and usually I have used Qt for desktop aplications.
I’ll try to write about all my achievements and how I reached them so other people can learn with it and maybe about some other non technology things
See you soon 
PS: English is not my mother tongue so if you find any error feel free to correct me
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