US D569814 S1
The ornamental design for an electronic controller, as shown and described.
FIG. 1 is a top perspective view of an electronic controller showing our new design;
FIG. 2 is a top view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a front side view thereof; and,
FIG. 6 is a rear view thereof.
The broken line showing of the remainder of the controller is for illustrative purposes and forms no part of the claimed design. The broken line immediately adjacent to the shaded area represents an unclaimed boundary of the design.