  We have conducted a 1.5 year-long variability study of the stars in the
Cygnus OB2 association, the region in the northern hemisphere with the highest
density of optically visible massive stars. The survey was conducted using four
pointings in the Johnson $R$ and $I$ bands with a 35 cm Meade LX200-ACF
telescope equipped with a 3.2 Mpixel SBIG ST10-XME CCD camera and includes 300+
epochs in each filter. A total of 1425 objects were observed with limiting
magnitudes of 15 in $R$ and 14 in $I$. The photometry was calibrated using
reference stars with existing $UBVJHK$ photometry. Bright stars have precisions
better than 0.01 magnitudes, allowing us to detect 52 confirmed and 19
candidate variables, many of them massive stars without previous detections as
variables. Variables are classified as eclipsing, pulsating, irregular/long
period, and Be. We derive the phased light curves for the eclipsing binaries,
with periods ranging from 1.3 to 8.5 days.
