Embedded programming

 $ sudo apt-get install python-rpi.gpio python3-rpi.gpio  

    import RPi.GPIO as GPIO # Import Raspberry Pi GPIO library
    from time import sleep # Import the sleep function from the time module
    GPIO.setwarnings(False) # Ignore warning for now
    GPIO.setmode(GPIO.BOARD) # Use physical pin numbering
    GPIO.setup(8, GPIO.OUT, initial=GPIO.LOW) # Set pin 8 to be an output pin and set initial value to low (off)
    while True: # Run forever
    GPIO.output(8, GPIO.HIGH) # Turn on
    sleep(1) # Sleep for 1 second
    GPIO.output(8, GPIO.LOW) # Turn off
    sleep(1) # Sleep for 1 second

 https://raw.githubusercontent.com/damellis/attiny/ide-1.6.x-boards-manager/package_damellis_attiny_index.json

 // constants won't change. Used here to set a pin number:
const int ledPin =  7;// the number of the LED pin

// Variables will change:
int ledState = LOW;             // ledState used to set the LED
// Generally, you should use "unsigned long" for variables that hold time
// The value will quickly become too large for an int to store
unsigned long previousMillis = 0;        // will store last time LED was updated
// constants won't change:
const long interval = 100;           // interval at which to blink (milliseconds)
void setup() {
  // set the digital pin as output:
  pinMode(ledPin, OUTPUT);
}
void loop() {
  // here is where you'd put code that needs to be running all the time.

  // check to see if it's time to blink the LED; that is, if the difference
  // between the current time and last time you blinked the LED is bigger than
  // the interval at which you want to blink the LED.
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval) {
    // save the last time you blinked the LED
    previousMillis = currentMillis;
    // if the LED is off turn it on and vice-versa:
    if (ledState == LOW) {
      ledState = HIGH;
    } else {
      ledState = LOW;
    }
    // set the LED with the ledState of the variable:
    digitalWrite(ledPin, ledState);
  }
}

 int led = 7;           // the PWM pin the LED is attached to
int brightness = 0;    // how bright the LED is
int fadeAmount = 5;    // how many points to fade the LED by
// the setup routine runs once when you press reset:
void setup() {
  // declare pin 9 to be an output:
  pinMode(led, OUTPUT);
}
// the loop routine runs over and over again forever:
void loop() {
  // set the brightness of pin 7:
  analogWrite(led, brightness);
  // change the brightness for next time through the loop:
  brightness = brightness + fadeAmount;
  // reverse the direction of the fading at the ends of the fade:
  if (brightness <= 0 || brightness >= 255) {
    fadeAmount = -fadeAmount;
  }
  // wait for 30 milliseconds to see the dimming effect
  delay(10);
}

int pinLed = 7;
int buttonPin = 2;
int ledState = 0;
int buttonState = 0;
int oldButtonState = 0;
void setup() {
  pinMode(pinLed, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP);
}
void loop() {
  int buttonState = digitalRead(2);
  if (buttonState == 0 && oldButtonState == 1){
     ledState = !ledState;
     delay (30);
     }
  oldButtonState = buttonState;
  if (ledState == 1){
     digitalWrite( pinLed, 1); 
     }
  else {
     digitalWrite( pinLed, 0); 
     }
}