I created a flow that uses 2 1-wire sensors (IN and OUT) to control a fan for a root cellar. See https://flows.nodered.org/flow/b513365783b6603d6981d83f2c0d56a9
NOTE: Before you use a 1-wire sensor on a Pi you need to add dtoverlay=w1-gpio to /boot/config.txt and reboot.
This was done on top of a GrovePi which gives us an alternative to GrovePi 1-wire temp sensor This could be helpful in cases where we want many sensors along a single wire.