Chapter 1freeGPIO: the first projectCreate a project for the NUCLEO-F401RE, blink the LED and read the button.1.1GPIO output: blink the LEDHands-onfreeGPIO (General-Purpose Input/Output) lets your code set a pin high (3.3 V) or low (0 V).1.2GPIO input: read the buttonHands-onfreeIn input mode the code reads the voltage on a pin.