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:    • Hacking My Ceiling Fan Radio Signal With a...   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: https://github.com/F5OEO/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: rpitx lists the Raspberry Pi 4 as having "beta" support. (I used a Raspberry Pi 3B.) Sparkfun: https://www.sparkfun.com/products/14643 Adafruit: https://www.adafruit.com/product/3055 Amazon: https://amzn.to/3crvFFI I found my low-pass filter on eBay (overseas shipping). Digikey has low-pass filters that would also work, but not as cheap. This site contains affiliate links for which I may be compensated. eBay low-pass filter: https://ebay.us/4cSPe5 eBay SMA antenna: https://ebay.us/GcL9qa eBay SMA connector: https://ebay.us/PGPmGM Note that these all have SMA connectors, not RP-SMA (which look very similar). Also note that eBay listings come and go, so double-check 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: https://incompetech.filmmusic.io/song... License: https://filmmusic.io/standard-license ----- Some links may be affiliate links.