mpu6050-Write to register not work problem

Using Arduino Networking, Protocols, and Devices
#1

I tried to write (0x01)to the Configuration CONFIG Register(0x1A) to set the DLPF_CFG bandwidth 188Hz,and read the register to check the value is right or not,but it still is zero.

  uint8_t h;

  Wire.beginTransmission(0x68);//mpu6050 address
  Wire.write(0x1A);//register address
  Wire.write(0x01);
  Wire.endTransmission();
  delay(2000);
  

   Wire.beginTransmission(0x68);
   Wire.write(0x1A);
   Wire.endTransmission();
   Wire.requestFrom(0x68,1);
   h=Wire.read();
   Serial.println(h);

I can read the value right by some registers have default values(register 107&117),so I think the reading part is right,which part of the code is wrong?

Thanks.

#2

I need to set the setSleepEnabled(false), dont know what is this yet .but it works.

#3

When the MPU-6050 is powered on, it is in sleep mode. You have to wake it up with the PWR_MGMT_1 register to be able to use the MPU-6050.
http://playground.arduino.cc/Main/MPU-6050#short

#4

Yes, I have read it .
but it doesn't explain what function would not work on sleep mode, I still can read register when in sleep mode.

#5