5V ~ 3.3V Logic Level converter 8 channel for Raspberry Pi GPIO, i2c, spi, UART

Rs-Pi I/O io I2C 23017 x8 128 GPIO Board for Raspberry Pi A/B & B+ B2 B3

5V - 3.3V Logic Level converter 4 channel for Raspberry Pi GPIO, i2c, spi, UART

I/O Pi ioPi I2C 23017 x4 64 GPIO Board for Raspberry Pi A B A+ B+ B2 B3

Rs-Pi I2C 23017 x2 32 bit GPIO io IO Board for Raspberry Pi A+ B+ 2B 3B

Rs-Pi I2C 23017 x2 - uln2803 x2 32bit GPIO multi-function Board for Raspberry Pi

Rs-Pi I/O io SPI 23s17 x8 -V3 128 GPIO Board for Raspberry Pi model A B B+ B2 B3

I/O Pi ioPi SPI 23s17 x4 64 GPIO Board for Raspberry Pi A B A+ B+ B2 B3