Abusing Raspberry Pi GPIO pins as a radio transmitter to control my ceiling fan

In Part 1, we covered capturing and decoding the remote control s signal using a USB TV tuner: In Part 2, we take use a Raspberry Pi s GPIO pin as an antenna to transmit our own signals to the ceiling fan. rpitx: The ceiling fan, light combo I have is Minka Aire brand. I think most of the different ones on the market work pretty similarly. Parts: I found my lowpass filter on eBay (overseas shipping). Digikey has lowpass filters that would also work, but not as cheap. eBay lowpass filter: eBay SMA antenna: eBay SMA connector: Note that these all have SMA connectors, not RPSMA (which look very similar). Also note that eBay listings come and go, so doublecheck that you get compatible parts. The antenna does not need to be exact the one I got is listed for 315 MHz and works just fine. Background music: Aerosol Of My Love by Kevin MacLeod Link: inco