What is the function of the isopod's antennae?

Antennae on arthropods perform sensory functions. In insects they detect moisture, temperature, and have olfactory functions; in crustaceans there are chemical receptors which function similar to our taste and smell for molecules drifting in seawater. There are also sensory receptors in many arthropod antennae which detect the amount of force from muscle action and the degree of bending and thus provide the touch sense. Some butterflies have a solar compass in their antennae, used for navigation.