Getting HTU21 Temperature/Humidity Sensor to work with Pi 1/2/3/Zero Getting HTU21 Temperature/Humidity Sensor to work with Pi 1/2/3/Zero Apr 8, 2016 raspberry pi Pi Zero i2c Sparkfun Adafruit HTU21 HTU21D enable i2s sudo raspi-config Advanced Settings > Enable I2C or run the commands below sudo sed -i 's/#dtparam=i2s-arm=on/dtparam=i2s-arm=on/g'