//attiny44a led 7 y btn 1
//attiny45 LED 4 y btn 3
#include<SoftwareSerial.h>
int BTN=1;// set a name for the button
int LED=7;//set a name fot the led
int state=LOW;//set a new variable to store the actual state of the LED
void setup ()
{
  pinMode(BTN,INPUT);//set the button as input
  pinMode(LED, OUTPUT);//set the led as output
  digitalWrite(LED,LOW);// set the output as low at the begining
  }
void loop()
{
  while(digitalRead(BTN)==LOW);//while the value keeps low 
  //do this
  state=digitalRead(LED);//read the actual state of the output
  digitalWrite(LED,!state);//negate the actual state and use it to declare the write
  delay(100);
  while(digitalRead(BTN)==HIGH);
  
}