![]() ![]() 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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