But the smarts don't stop there. Different bullets register different amounts of electricity with the piezoelectric sensors. Using data from those electric charges, TARDEC researchers are developing complex algorithms that can determine what size round is striking the armor, giving soldiers the added benefit of knowing what kind of weaponry the enemy is packing. Meanwhile, though the amount of electricity generated from each bullet strike is very low, researchers are looking at ways to harness it, perhaps using it to power other kinds of sensors.