Breakout board for Texas Instruments' eight-channel I2C multplexer allowing eight separate I2C devices to be controlled by a single host I2C bus. The breakout board accepts VIN from 1.65 to 5.5 V, the I2C lines all have 4K7 pull-up resistors, it has an active low reset (not broken out here but accessible via the resistor solder pad). The TCA9548A can have one of eight addresses so, in principle, up to eight of these boards could be ganged to control 64 separate I2C devices with one master I2C bus. This is particularly useful when using multiples of the same I2C sensor such as motion sensors or environmental sensors where the sensor device has a very limited (usually 2) range of I2C addresses. Added solder jumper to access two of the TCA9548A addresses so up to 16 I2C devices with the same I2C address can be managed with a single host I2C master bus using two of these boards.