  We present the first results from a minute cadence survey of a three square
degree field obtained with the Dark Energy Camera. We imaged part of the
Canada-France-Hawaii Telescope Legacy Survey area over eight half-nights. We
use the stacked images to identify 111 high proper motion white dwarf
candidates with g $\leq24.5$ mag and search for eclipse-like events and other
sources of variability. We find a new g = 20.64 mag pulsating ZZ Ceti star with
pulsation periods of 11-13 min. However, we do not find any transiting
planetary companions in the habitable zone of our target white dwarfs. Given
the probability of eclipses of 1% and our observing window from the ground, the
non-detection of such companions in this first field is not surprising. Minute
cadence DECam observations of additional fields will provide stringent
constraints on the frequency of planets in the white dwarf habitable zone.
