You're using the 8 bit address (0x70) and should be using the 7 bit address of the I2C device (0x38) instead. Bit 0 of the slave address determines direction of data flow (read or write) and is automatically inserted by the Wire library.
You're using the 8 bit address (0x70) and should be using the 7 bit address of the I2C device (0x38) instead. Bit 0 of the slave address determines direction of data flow (read or write) and is automatically inserted by the Wire library.