Abstract: The pressure based control engine directs the amount of amperage that is applied to an electric device, such as a flashlight. The control engine provides a first piston body and a second piston body that conduct electricity. A piston divider constructed from a quantum tunneling material separates the first piston body and the second piston body. Compression of the piston divider by the first piston body and the second piston causes the piston divider to conduct electricity. As the pressure increases, the current that can flow through the piston divider also increases. Similarly, as the pressure decreases, the current that can flow through the piston divider decreases.