You can extend Flipper Zero functionality by writing your own code using familiar Arduino IDE
software. Uploading sketches is as easy as to the regular Arduino board.
All built-in Flipper hardware can be used in your programs, such as a built-in display to print text and draw images, buttons to navigate, radio module for Sub-1Ghz communication, RFID for proximity card, IR for infrared applications and GPIO for extending the functionality with your own modules.
And don't worry about bloating the memory — Flipper has four times more flash than Arduino Mega.