The Arduino IDE is a nice tool for starting ... but it demonstrates the possibilities. The code starts as: void loop() { static unsigned char cnt = 0; static bool state = false; analogWrite ...

You’ll also need the Arduino IDE (a recent copy ... any character press should do it. The main code is pretty simple: void loop() { static int oldstate=-1; static int linect=0; int state ...

You will need the Arduino Board, a 560Ω resistor, and LED and the code example below. We set the pinButton variable ... OUTPUT); //set the LED pin as OUTPUT } void loop() { int stateButton = ...