We claim the ornamental design for a smartphone tripod connector, as shown and described.
FIG. 1 is a perspective view of a smartphone tripod connector;
FIG. 2 is a rearward perspective view thereof;
FIG. 3 is frontal perspective view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a rear elevational view thereof
FIG. 7 is a front elevational view thereof;
FIG. 8 is a top plan view thereof; and,
FIG. 9 is a bottom plan view thereof.
Broken lines in FIG. 1 are used to illustrate an example smartphone and smartphone protector connected to the smartphone tripod connector; broken lines in FIGS. 3-5, 7 and 9 are used to illustrate unclaimed portions of the smartphone tripod connector; broken lines form no part of the claimed design.