Fritzing

A blinking LED with 2 pushbuttons to increase/decrease the blinking frequency and a LCD to display the frequency in ms.

• 

- blinking yellow LED (frequency calculated by program) controlled

  > by a digital output on pin 7

  > by a NPN mosfet

- NPN mosfet (to enable yellow LED) controlled by an analogic output on pin 6

- increasing freq pushbutton (with a green feedback LED) as digital input on pin 8

- decreasing freq pushbutton (with a red feedback LED) as digital input on pin 9

- LCD (16x2) controlled by <LiquidCrystal.h> library:

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);