i2c.start();
        a=i2c.write(0x50);// device addr
        a1=i2c.write(0x16);  //registeraddr
        a2=i2c.write(0x01);  //data 
        i2c.stop();


i2c.start();
    a=i2c.write(0x50);  // A write to device 0x1D
    a1=i2c.write(0x16); // Register to read from (acceleration in X)
    i2c.start();        // SR
    a2=i2c.write(0x51); // Read from device 
    c=i2c.read(0);      // Read the data with NACK
    i2c.stop();