Position-sensing detector arrangement for controlling a faucet

1. A faucet arrangement, comprising:

a spout;

an infrared sensing device configured to:

emit infrared energy;

receive the infrared energy after the energy has been reflected; and

produce a distance signal indicative of a distance traveled by the infrared energy before being reflected; and

a control device in communication with said sensing device and configured to control a flow of liquid through said spout dependent upon whether the distance signal exceeds a threshold distance value, the threshold distance value being adjusted over time based upon distance signal stability.

2. The arrangement of claim 1 wherein distance signal is produced at a plurality of points in time to thereby indicate the distance at each of the points in time, the distance signal stability comprises a level of stability of the distance signal over time.

3. The arrangement of claim 2 wherein the level of stability comprises a range of the distance signal within a preceding time period.

4. The arrangement of claim 2 wherein said control device is configured to filter the distance signal, and to control the flow of liquid through said spout dependent upon whether the filtered distance signal exceeds the threshold distance value.

5. The arrangement of claim 1 wherein said sensing device comprises a position-sensing detector.

6. The arrangement of claim 1 wherein said sensing device is configured to be installed such that a direction of emission of the infrared energy is oriented an angle of approximately between 5 and 15 degrees relative to a vertical direction.

7. The arrangement of claim 1 wherein the threshold distance value is maintained to be at least a predetermined amount greater than a value associated with the distance signal if the rate of change associated with the distance signal is within a predetermined range.

8. A faucet arrangement, comprising:

a spout;

an infrared sensing device configured to:

emit infrared energy;

receive the infrared energy after the energy has been reflected; and

produce a distance signal indicative of a distance traveled by the infrared energy before being reflected, the distance signal being produced at a plurality of points in time to thereby indicate the distance at each of the points in time; and

a control device in communication with said sensing device and configured to:

filter the distance signal over time based upon at least one environmental condition; and

control a flow of liquid through said spout dependent upon whether the filtered distance signal exceeds a threshold distance value, the threshold distance value being adjusted over time based upon at least one environmental condition.

9. The arrangement of claim 8 wherein the environmental condition comprises a level of stability of the distance signal over time.

10. The arrangement of claim 9 wherein the level of stability comprises a range of the distance signal within a preceding time period.

11. The arrangement of claim 8 wherein the environmental condition comprises whether said spout has been touched by a user.

12. The arrangement of claim 11 wherein the environmental condition comprises a time duration of the touching of said spout by the user.

13. The arrangement of claim 8 wherein said sensing device comprises a position-sensing detector.

14. The arrangement of claim 8 wherein said sensing device is configured to be installed such that a direction of emission of the infrared energy is oriented an angle of approximately between 5 and 15 degrees relative to a vertical direction.

15. The arrangement of claim 8 wherein the filtering of the distance signal includes calculating a moving average of a plurality of preceding values of the distance signal, a number of the preceding values included in the moving average being dependent upon a level of stability of the distance signal over time.

16. A faucet arrangement, comprising:

a spout;

an infrared sensing device including:

an infrared energy emitter, and

an infrared energy receiver configured to receive reflected infrared energy from the emitter, wherein a distance signal is produced indicative of a distance traveled by the infrared energy before being reflected;

a control device in communication with the sensing device and configured to control a flow of liquid through the spout dependent upon whether the distance signal exceeds a threshold distance value, the threshold distance value being adjusted over time based upon an environmental condition; and

wherein the environmental condition includes at least one of:

a level of stability of the distance signal over time;

whether the spout has been touched by a user; and

a rate of change associated with the distance signal.

17. The arrangement of claim 16 wherein the level of stability comprises a range of the distance signal within a preceding time period.

18. The arrangement of claim 16 wherein the control device is configured to filter the distance signal, and to control the flow of liquid through the spout dependent upon whether the filtered distance signal exceeds the threshold distance value.

19. The arrangement of claim 16 wherein the environmental condition includes a time duration of the touching of the spout by the user.

20. The arrangement of claim 16 wherein the sensing device comprises a position-sensing detector.

21. The arrangement of claim 16 wherein the sensing device is configured to be installed such that a direction of emission of the infrared energy is oriented an angle of approximately between 5 and 15 degrees relative to a vertical direction.

22. The arrangement of claim 16 wherein the threshold distance value is maintained to be at least a predetermined amount greater than a value associated with the distance signal if the rate of change associated with the distance signal is within a predetermined range.