Three BlinkMs bussed together on Arduino I2Chas address 0x12 has address 0x13 has address 0x14 Analog In pin 4 is SDA. Analog In pin 5 is SCK.
You can assign their addresses so they all are independently addressable. Or leave them all at the same address (or use the broadast address of "0") to address them all at once.
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