/* serial_pin_control_with_breathing - take commands from serial and light or extinguish leds based on it Demonstration of taking serial commands while doing something else. */ int max_led=7; int m ...

Here our Arduino Board is listening to serial interface (with serialEvent) and each time we receive "\n" the main loop will turn on/off the led depending on value (1 - On, 0 - Off) We can use I2C and ...