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I2C Master Serial Interface Controller
I2C Slave Serial Interface Controller
I2C - learn.sparkfun.com
CAN modules – Auvidea
MCP2515 CAN Controller Shield FOR Arduino UNO R3 Study Expansion UART I2C IIC SPI Interface 30mA Board Module|Smart Remote Control| - AliExpress
Buy MCP2515 CAN Controller Shield FOR Arduino UNO R3 Study Expansion UART I2C IIC Interface SPI Interface 30mA Board Module at affordable prices — free shipping, real reviews with photos — Joom