The ornamental design for a seedsensor, as shown and described.
FIG. 1 is a left front perspective view of a seed sensor showing our new design.
FIG. 2 is a right front perspective view thereof.
FIG. 3 is a left side view thereof.
FIG. 4 is a front view thereof.
FIG. 5 is a top view thereof.
FIG. 6 is a bottom view thereof.
FIG. 7 is a right side view thereof; and,
FIG. 8 is a rear view thereof.
The broken line showing of an electrical connector is included for the purpose of illustrating environmental structure only and forms no part of the claimed design.