What it does have is user-programmable GPIO and the rpitx package, which converts a GPIO pin into a basic radio transmitter. wanted to use a Raspberry Pi to bring the fans into his home automation system, but the Raspberry Pi doesn’t have a 304.2 MHz radio. With that knowledge, he digitized the radio commands from all seven buttons and was quickly able to reverse-engineer the entire protocol. digitized a button press with it and immediately recognized it as simple on-off keying (OOK). Universal Radio Hacker is a tool designed to make deciphering unknown wireless protocols relatively painless using an RTL-SDR. Next was to reverse-engineer the protocol. Although public FCC records will reveal the frequency of operation, thought it would be faster to use an inexpensive USB RTL-SDR with the Spektrum program to sweep the range of likely frequencies, and quickly found the fans speak 304.2 MHz. Step one was to determine the frequency the fan’s remote used. The problem was this: although the fans were wireless, their frequency and protocol were incompatible with the home automation system. After moving into a new house, he wanted to assimilate two wirelessly controlled fan lights into his home automation system.
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