Add the following lines to /boot/config.txt and reboot. dtparam=i2c1=on dtparam=spi=on The spi devices should be present if you do $ ls -l /dev/spi* crw-rw---- 1 root spi 153, 0 Mar 13 22:17 /dev/spidev0.0 crw-rw---- 1 root spi 153, 1 Mar 13 22:17 /dev/spidev0.1 $ For I2C you'll probably have to in...