I have a SHT3x humidity and temperature sensor connected to the i2c bus of my Turris Omnia that runs OpenWrt.

To make it produce nice graphs shown in the webif I installed the packages collectd-mod-sensors, luci-app-statistics and kmod-hwmon-sht3x.

To make the sht3x driver bind to the device I added

echo 'sht3x 0x44' > /sys/bus/i2c/devices/0-0070/channel-6/new_device

to /etc/rc.local. After that I only had to enable the Sensors plugin below Statistics -> Setup -> General plugins and check 'Monitor all except specified` in its "Configure" dialog.