interfacing nrf52840 with gy-521 and gy-89 sensor

Let me get this straight, by gy-521 you mean mpu6050 right?

BMP180 

CAN YOU PLEASE HELP ME HOW TO READ SENSOR VALUE THAT HAVE SCK,SDA PINS AND MONITOR IN ANY SERIAL MONITOR.

YOU CAN TELL FOR ANY SENSOR,THEN I WILL MODIFY FOR MY CODE

Refer the TWI Master example in the sdk for reference(SCK and SDA pins are used in TWI protocol). All the libraries are already there you just have to understand and use it.

I also found a site which may help you

https://github.com/gabriel-ns/nRF5-sensor-libraries

Now that library is made for nf51 but you're using an nrf52840 so just use this as a reference, it has BMP180 interfacing example

The breakout board gy-521, includes the MPU-6050 device (accelerometer and gyro), thus you can use this link to get it working.

Follow these steps (assuming you have keil installed):

1. Connect the MPU-6050 to the board in the following manner:
   • Pin 27 on nrf52840 → SCL on the gy-521 board
   • Pin 26 on nrf52840 → SDA on the gy-521 board
   • VDD  on nrf52840   → VCC on the gy-521 board
   • GND  on nrf52840   → GND on the gy-521 board
2. Enter this this link
3. Follow the steps in the link, under “How to use”
   • You can start with  the mpu-simple example for simplicity
   • In your case, define MPU6050
   • Use the following definitions in the file nrf_drv_mpu_twi/nrf_drv_mpu_spi

   • #define MPU_TWI_SCL_PIN 27
     #define MPU_TWI_SDA_PIN 26

4. Enable logging in order to see the sensor data

I followed these steps using MPU9250, and it worked fine. However, the examples are not tested on MPU6050, but please ask if it doesn't work. This could be a start, and if you get it to work I can help you with the gy-89.

Best regards Simon