Illumination feature for electronic devices

1. A home security sensor, comprising:

a circuitry board comprising circuitry for performing a home security-related function and a light emitter;

an opaque housing that contains the circuitry board; and a light cone, disposed between the light emitter and the opaque housing, for projecting a predetermined geometric outline onto an inside surface of the housing.

2. The home security sensor of claim 1 , wherein the predetermined geometric outline is projected from an annular projection surface of the light cone.

3. The home security sensor of claim 2 , wherein the light cone is constructed from a clear material, and comprises: a distal end comprising a depression formed in the clear material, the depression for covering the light emitter; and a proximal end larger in diameter than the distal end, comprising the annular projection surface in the shape of the predetermined geometric outline.

4. The home security sensor of claim 3 , further comprising: a channel disposed into the inside surface of the housing, sized and shaped in conformity with the predetermined geometric outline; wherein the channel receives the proximal end of the light cone when the home security sensor is assembled.

5. The home security sensor of claim 4 , wherein the channel comprises a cross-section sized and shaped to capture the proximal end.

6. The home security sensor of claim 4 , wherein light from the light emitter is projected onto the channel.

7. The home security sensor of claim 2 , wherein the distal end is in proximity to the light emitter when the electronic device is assembled.

8. The home security sensor of claim 2 , wherein the distal end comprises a depression sized and shaped to encompass the light emitter when the electronic device is assembled.

9. The home security sensor of claim 2 , wherein the proximal end comprises an annular ring.

10. The home security sensor of claim 1 , wherein the light cone comprises a distal end configured to receive light from the light emitter and channel the light through a body of the light cone to a proximal end, the proximal end abutting the inside surface of the housing.

11. The home security sensor of claim 1 , further comprising: driver circuitry coupled to the light emitter; and a processor coupled to the driver circuitry; wherein the processor causes the light emitter to activate upon a determination by the processor that a predetermined event has occurred.

12. The home security sensor of claim 11 , wherein the predetermined event comprises opening a door or a window by a user.

13. A home security sensor for projecting an illuminated, predefined geometric shape from an exterior surface of the home security sensor, comprising:

circuit board comprising a light emitter;

a housing for containing the circuit board, the housing comprising a channel formed into an underside surface of the housing and in vertical alignment with the light emitter; and

a light cone disposed between the underside surface and the circuit board, comprising an annular projection surface mounted to the channel and an opposing distal end portion comprising a depression sized and shaped to receive light from the light emitter.

14. The home security sensor of claim 13 , wherein the light cone comprises: an internal, conical wall forming a first apex pointing towards the distal end portion; and a second, internal wall formed into the distal end portion, forming the depression, the depression comprising a second apex pointing toward the first apex.

15. The home security sensor of claim 14 , wherein the light cone comprises a polished, outer wall and the internal conical wall comprises a polished internal wall.

16. The home security sensor of claim 13 , wherein the housing cover comprises a first thickness in an area proximate to the channel, and a second thickness, thinner than the first thickness, in an area that defines the channel.

17. The home security sensor of claim 13 , wherein the predetermined geometric shape comprises an annular ring.