A dryer appliance and sensor assembly are provided. The sensor assembly may include a sensor housing, an appliance sensor, a wireless transmission tag, and a generator. A magnet rail is statically affixed to a cabinet. The sensor housing may extend within a drum and define a compartment proximate a space for the receipt of clothes. The generator is positioned within the compartment. The drum positions the generator in operable communication with the magnet rail. The appliance sensor may be positioned on the sensor housing. The wireless transmission tag may be positioned within the compartment. The wireless transmission tag may be in communication with the appliance sensor. The wireless tag reader may be in operable communication with the wireless transmission tag.