  We report the results of CCD photometric observations in the direction of the
Coma Berenices and Upgren 1 open clusters with the aim at searching for new
short-period variable stars. A total of 35 stars were checked for variability.
As a result of this search the star designated in the SIMBAD database as
Melotte 111 AV 1224 was found to be a new eclipsing binary star. Follow-up
Str\"omgren photometric and spectroscopic observations allowed us to derive the
spectral type, distance, reddening and effective temperature of the star. A
preliminary analysis of the binary light curve was performed and the parameters
of the orbital system were derived. From the derived physical parameters we
conclude that Melotte 111 AV 1224 is most likely a W UMa eclipsing binary that
is not a member of the Coma Berenices open cluster. On other hand, we did not
find evidence of brightness variations in the stars NSV 5612 and NSV 5615
previously catalogued as variable stars in Coma Berenices open cluster.
