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Reverse Engineering the Propel ExecuHeli IR Protocol

IndoorHeliProtocols

Here’s a reverse engineering project that is instructive re: how to parse out several channels of IR commands issued to control an indoor helicopter.

From PetaVolt, via Hack A Day:

After seeing all of the Syma 107′s hacked I thought I would try to decode the IR protocol on my Propel ExecuHeli.  Here are my findings.

For accuracy purposes I decided to find the signal on the controller board.  I traced the IR LEDs through a transistor to pin 6 of the micro.

Unfortunately, there are no markings of any kind on the micro.  It looks like it was manufactured without them.

Before digging into the protocol I thought I would have a look at what frequency the data is modulated at for the three different channels….

Read more.


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