Aliexpress 2.5$
Example code: https://learn.adafruit.com/adafruit-tca9548a-1-to-8-i2c-multiplexer-breakout/wiring-and-test
datasheet: http://www.ti.com/lit/ds/symlink/tca9548a.pdf
i2c port: 0x70 (0x70-0x77)
Aliexpress 2.5$
Example code: https://learn.adafruit.com/adafruit-tca9548a-1-to-8-i2c-multiplexer-breakout/wiring-and-test
datasheet: http://www.ti.com/lit/ds/symlink/tca9548a.pdf
i2c port: 0x70 (0x70-0x77)