DS18B20 is a 1-wire temperature sensor. Currently in boneIO it can be connected only through DS2482. Read DS2482. to find out how to retrieve address of your DS18B20.
ds2482:
id: ds2482
address: 0x18
dallas:
- id: temperature
address: 0x6e0300a279d76428
ds2482_id: ds2482
update_interval: 60s