ASCII Serial Data Transmission:

To place the IMU in ASCII serial data transmission mode, ground the SDO (slave data out) pin. In this mode, the IMU transmits roll, pitch, and yaw data (in degrees) on the Tx pin. The data is transmitted continuously at a baud rate of 115,200. New data is transmitted at 50 Hz. Below are three examples that show how to use the IMU in serial mode.

To get the ASCII data into a PC:

Example 1:
Use the Arduino’s built-in FTDI to USB chip. Connect the IMU to the Arduino 3.3V supply and ground. Connect the IMU Tx to the Arduino’s Tx line (pin 1). Ground the SDO pin. On serial monitor,set the baud rate to 115200, 8 data bits, 1 stop bit, parity: none, flow control: none. Make sure that you are not running a program on the Arduino that sends out ascii data so that there is no other data being transmitted to the FTDI chip.
Example 2 - To get the ASCII data into an Arduino:

Note: If you want to read the IMU output data with the Arduino, you can use the following approach but it is not the best way to do it. It is much faster to use the SPI lines as shown in the SPI Data Transmission file. Use the same wiring as in Example 1 above, but move the Tx wire from the IMU to the Rx line (pin 0) of the Arduino. You can now run the standard Arduino example program called “SerialEvent” to read the data. You need to change the baud rate in the program to 115200. In order for this approach to work, you need to leave the IMU unpowered while downloading the Arduino code. This is because the code goes into the Arduino via the Rx line so it should not be competing with the 50 Hz IMU data transmission. Power up the IMU after the code has been loaded, and the example will work.
Example 3:

Use an FTDI to USB chip without an Arduino. With this approach you need a terminal emulator like hyperterminal or ClearTerminal. Connect the IMU to the 3.3V supply and ground from the FTDI chip (Warning: The 3.3v output current of the FTDI chip is rated at 50ma and the IMU needs 75ma so the FTDI chip could burn out with this setup. It would be better to use an external 3.3v supply). Connect the IMU Tx to the FTDI Rx pin. Ground the SDO pin. On the PC terminal emulator, set the baud rate to 115200, 8 data bits, 1 stop bit, parity: none, flow control: none.
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