This patch adds driver for temperature/humidity sensor connected via GPIO. It called gpioths. Just add "device gpioths" into kernel and hints like:
# Temp/Humidity sensors hint.gpioths.0.at="gpiobus0" hint.gpioths.0.pins=1
As results it will provide temperature/humidity values via sysctl:
dev.gpioths.0.temperature: 28 dev.gpioths.0.humidity: 31
DHT11 is cheap & popular temperature/humidity sensor and there is significant amount of blog posts how to meet freebsd & DHT11 (last dated by today, Jan14). It's really worth to bring support into tree. DHT11 is single-wire sensor. It can be connected via GPIO to device like Raspberry Pi or Onion Omega.
- man page