Posted by Jordi Muñoz on March 15, 2009 at 12:00pm
Since i got my new 2.4ghz spektrum radio (I FALL IN LOVE) i always wonder how the daughter receiver send data to the mother, maybe PPM? mmhh not! With a little help of an oscilloscope i started to reverse engineer the protocol used, well i saw only steady digital signal with lows of 8.6 useconds, that responded to the movements of my radio, so i quickly realize that is some kind of serial communication, and i did the calculations (1000000us/8.6us=116279bps) and i thought that maybe the serial speed was 115200bps. So i attached my FTDI cable and start analyzing the data, and i got this:Spektrum daughter board is sending 16 bytes of information using a serial com. running at 115200bps. As you see in the picture above, the two first bytes are the preamble or sync bytes (0x03, 0x01). The data comes in integers that response precisely in the order is labeled in the picture...So Paparazzi users this is a way to switch 2.4ghz (only in American), the back of my Specktrum radio says: "NOT FOR USE IN EU", uuh!I hope somebody can do something usefully with it, enjoy!
Mikado is going to release a new version of their 3-axis stabilization system for model helicopters that uses a Spektrum satellite receiver only. It's called the Mini VBar.
The Spektrum radios are sold in the EU as well but they seem to be limited in the output power.
Spectrums are allowed in the UK, and thanks, this simplifies things, I wonder if one could find a similar signal in the transmitter. as i want to use it's handset form.
I have a couple of these units and on some projects it could be very useful to know what the spektrum is receiving especially for the binding problems I have come accross. Thanks jordi.
Comments
Mikado is going to release a new version of their 3-axis stabilization system for model helicopters that uses a Spektrum satellite receiver only. It's called the Mini VBar.
The Spektrum radios are sold in the EU as well but they seem to be limited in the output power.
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