Light Sensor

When first placed the Light Sensor is in hybrid mode, which detects all kinds of lights and sends out a Redstone signal equivalent to the amount of light it senses. Shift Right-Click with the Screwdriver to cycle through modes which only detect sunlight, and then artificial light.

Rain Sensor

This gate will output a Redstone Signal if it detects Rain. It must have a direct line of sight with the sky to work.