I use info from http://full-chip.net/arduino-proekty/97-cifrovoy-fm-priemnik-na-arduino-i-module-rda5807-s-graficheskim-displeem-i-funkciey-rds.html & http://seta43.hol.es/radiofm.html
see http://nicuflorica.blogspot.ro/2016/07/radio-fm-cu-rda5807-si-arduino.html