#include <USIWire.h>                 // I2C Master lib for ATTinys which use USI

#define ADDR   0x26              
#define LED1_PIN 3  // ATtiny Pin 3

int rec=0;

void setup(){
  pinMode(LED1_PIN,OUTPUT);
  
  Wire.begin();                    // initialize I2C lib
}


void loop(){
   Wire.beginTransmission(ADDR);
   Wire.write(B00000001);            // Send 1 byte`
   delay(500);
   Wire.endTransmission();
}