Methods and apparatus for generating an information signal. Exemplary methods
and apparatus may comprise (A) electrically associating at least one LED with a
Seebeck power generator; (B) thermally associating the Seebeck power generator
with a surface; and (C) heating the surface to cause the Seebeck power generator
to generate electricity to energize the at least one LED. In one example, such
methods and apparatus may be used to provide an indication of the temperature of
a surface.
