// Code pour l'Attiny84
#include <SoftwareSerial.h>

SoftwareSerial mySerial(3,NULL); //RX, TX

uint8_t blueLED = 10;
uint8_t v;
void setup() {

  mySerial.begin(9600);
  pinMode(blueLED, OUTPUT);
  digitalWrite(blueLED, LOW);

}

void loop() {

  v = mySerial.read();
  if (v == '1')
    digitalWrite(blueLED, HIGH);
  if (v == '2')
    digitalWrite(blueLED, LOW);

}