FM (mono) receiver analyzer with RDS optimized for Raspberry Pi 4, made with GnuRadio 3.7.

sudo apt install gnuradio gr-osmosdr gr-rds

For mono: grcc RPi4_FM_RDS.grc -e -d /home/pi

For stereo: grcc RPi4_FM_S_RDS.grc -e -d /home/pi

For mono: python ./RPi4_FM_RDS.py

For stereo: python ./RPi4_FM_S_RDS.py

Tested and working with Raspberry Pi 4 and generic DVB-T USB receiver with Realtek RTL2838UHIDIR chip (with Rafael Micro R820T tuner), should also be working on Raspberry Pi 3.