Is the Aardvark I2C/SPI Host Adapter compatible with 1.2V/1.5V/1.8V/2.5V devices?

The Aardvark I2C/SPI Host Adapter operates at 3.3V signal levels. To communicate with devices that operate at a lower voltage, use the level shifter board between the Aardvark adapter and the target device in order to provide the correct I2C/SPI signals level to both devices. Take a look at the level shifter board product page for more details .