//// counting by pushing the button and turning the led on

// int button_pin = 6; 
// int button_value, button_oldvalue;
// int led_pin = 4; 
// int counter; 
// int led_state = 4;
 
 
// void setup() { 
//   pinMode(button_pin, INPUT_PULLUP); 
//   pinMode(led_pin, OUTPUT); 
//   Serial.begin(9600); 
// } 
 
 
// void loop() { 
//   readButton(); 
//   digitalWrite(led_pin, counter%2); 
// } 
 
// void readButton() { 
//   button_value = !digitalRead((button_pin)); 
   
//   if (button_value == 1 && button_oldvalue == 0) { 
//     counter++; 
//     Serial.println(counter); 
//   } 
//   else { 
//     delay(50); 
//     //digitalWrite(led_pin, LOW);     
//   } 
 
 
 
// button_oldvalue = button_value; 
// // same things 
 
// } 
 
// if (button_value == 1){ 
//   counter++; 
//   Serial.println(counter); 
// } 




/// holding the led on by pushing the button/ замыкание

// int button_pin = 6; 
// int button_value, button_oldvalue;
// int led_pin = 4; 
// int counter; 
// int led_state = 4;
 
 
// void setup() { 
//   pinMode(button_pin, INPUT_PULLUP); 
//   pinMode(led_pin, OUTPUT); 
//   Serial.begin(9600); 
// } 
 
 
// void loop() { 
//   button_value = !digitalRead(button_pin); 
//   if (button_value != button_oldvalue) { 
//     button_oldvalue = button_value; 
//     if (button_value == LOW){ 
//       led_pin = (led_pin == HIGH)  ?  LOW: HIGH; 
//       digitalWrite(led_state, led_pin); 
//     } 
//   } 
// } 
 

// holding the switch on by led

int button_pin = 6; 
int button_value; 
int led_pin = 4; 
 
void setup() { 
  pinMode(button_pin, INPUT_PULLUP); 
  pinMode(led_pin, OUTPUT); 
  Serial.begin(9600); 
} 
 
void loop() { 
  button_value = !digitalRead((button_pin)); 
  Serial.println(button_value); 
 
 
//same things 
digitalWrite(led_pin, button_value); 
 
 
if (button_value ==1) { 
  digitalWrite(led_pin, HIGH); 
} else { 
  digitalWrite(led_pin, LOW); 
} 
}