  The Casimir interaction is omnipresent source of forces at small separations
between bodies, which is difficult to change by varying external conditions.
Here we show that graphene interacting with a metal can have the best known
force contrast to the temperature and the Fermi level variations. In the
distance range 50-300 nm the force is measurable and can vary a few times for
graphene with a bandgap much larger than the temperature. In this distance
range the main part of the force is due to the thermal fluctuations. We discuss
also graphene on a dielectric membrane as a technologically robust
configuration.
