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1wire
The 1wire bus supports various low speed digital devices and is supported in Linux on the Raspberry Pi.
Raspberry Pi
boot/config.txt:
dtoverlay=w1-gpio,gpiopin=4
modprobe w1_gpio
DS18B20 Thermometer
modprobe w1_therm cat /sys/bus/w1/devices/28-041460bdd6ff/w1_slave 8f 01 55 00 7f ff 0c 10 a0 : crc=a0 YES 8f 01 55 00 7f ff 0c 10 a0 t=24937
DS2431 EEPROM
modprobe w1_ds2431