To use more than one of particular I2C sensor, the Address(es) must be changed so no two sensors have the same address. This video walks through how to change the I2C address.
If you are using the FTC SDK, be sure to set your I2C address using I2cAddr.create8bit(0x3a) so you do not have to convert from an 8-bit address to a 7-bit address.
