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2PCS DS3231 AT24C32 IIC RTC Module Clock Timer Memory Module Beats Replace DS1307 I2C RTC Board with Male to Female Jumper Wire Cable at Amazon.com
![Amazon.com: Adafruit TCA9548A I2C Multiplexer [ADA2717] : Patio, Lawn & Garden](https://m.media-amazon.com/images/I/71-f48v-qxL._AC_UF894,1000_QL80_.jpg "Amazon.com: Adafruit TCA9548A I2C Multiplexer [ADA2717] : Patio, Lawn & Garden")