fm_transmitter

You can broadcast FM radio over short distances by doing PWM over GPIO pins, so that does not suprise me! I used this for switching radio controlled power outlets which had 433mhz receivers. [2] [1] https://github.com/markondej/fm_transmitter?tab=readme-ov-fi... [2] https://github.com/F5OEO/rpitx

I really liked the explanation of how he used harmonics to get to the frequency he desired. Also, LoRa is really good when it comes to low power data transmission. To share a recent example, with just ~100mW of transmission power, they managed to fly an RC plane to a distance of 100km: https://www.youtube.com/watch?v=CYJ2UOrlXgM .(Their transmitter from the ground station was configured at a higher power, but the transmitter on the aircraft was transmitting telemetry back at 100mW throughout the distance) Another related fun project is using raspberry pi gpio to work as an FM transmitter: https://github.com/markondej/fm_transmitter

Funny, in last weekend I was playing with various projects [0][1][2] based on the idea from this article. It was impressive how long range Raspberry Pi achieved even without the cable antenna. They do work - transmit audio over the FM waves, but sadly the quality (buzzing noise) is far from expectations. Initially, I thought it is just my Raspi 3B, but when dived into the issues section on GitHub, I noticed more people were claiming they had similar problems. Do you know what could cause such degradation? Is there any better solution to transmit FM in a home? Worrying fact is it also spams close ranges making them unable to listen. Have you applied any filter making it more stricter about the wave range it will take? [0]: https://github.com/ChristopheJacquet/PiFmRds [1]: https://github.com/markondej/fm_transmitter [2]: https://github.com

I wrote nothing. Be warned: setting the transmit frequency below 100 MHz will result in the raspi locking up. https://github.com/markondej/fm_transmitter