Prerequisites

The piio command

Using the piio command requires root permissions.

The twowire command

For the twowire command, i2c functionality must be enabled on the Raspberry Pi:

• Unblacklist i2c-bcm2708 in /etc/modprobe.d/raspi-blacklist.conf by putting a # in front of the line
• Enable i2c-dev by adding it in /etc/modules
• Add the user to the i2c group using the command: sudo usermod -aG i2c pi