I2C device not showing

Question

I have a Raspberry Pi 2 running Raspbian 3.18.11 I connected a DS18B20 sensor via i2c.

Problem is: it does not show up on i2cdetect -y 1

However, that data from the sensor is available at /sys/bus/w1/devices/28-xxx/w1_slave and seems to be correct (changing when touched).

lsmod | grep shows i2c_dev and i2c_bcm2708 /boot/config.txt has

dtparam=i2c=on

dtoverlay=w1-gpio,gpiopin=4

And blacklist.conf is empty.

Any ideas?

Answer 1

The DS18B20 is not an I2C device.

The DS18B20 is a so called 1-wire device and uses the Dallas 1-wire protocol.