Faucet with a monitoring device and a monitoring method thereof

1. A faucet comprising:

a faucet body;

a switch unit coupled rotatably to said faucet body; and

a monitoring device mounted to said switch unit, said monitoring device including:

an angle detector for detecting angular rotation of said switch unit from an initial position relative to said faucet body, and for generating angle information corresponding to the angular rotation thus detected;

a microprocessor coupled electrically to said angle detector for receiving the angle information, for recording a cumulative time period within which said switch unit is in an open state, for calculating an outflow rate according to the angle information, and for calculating an outflow value according to the outflow rate and the cumulative time period, said microprocessor determining when the microprocessor is in a mechanical equilibrium state and said microprocessor generating an alert signal upon determining that the outflow value has reached a predetermined threshold; and

an alert unit coupled electrically to said microprocessor for receiving the alert signal and for generating an alert output in response to the alert signal; wherein said angle detector is a three-axis gravitational sensor, and the initial position is set after said microprocessor has entered a mechanical equilibrium state.

2. The faucet as claimed in claim 1 , wherein said alert unit includes a light emitting diode.

3. The faucet as claimed in claim 1 , wherein said monitoring device further includes a shell mounted detachably to said switch unit, and a circuit board disposed in said shell, said angle detector and said alert unit being disposed on said circuit board.

4. The faucet as claimed in claim 1 , wherein said switch unit has an axis of rotation relative to said faucet body that extends along a substantially horizontal plane.

5. A monitoring device for a faucet, the faucet including a faucet body and a switch unit coupled rotatably to the faucet body, said monitoring device to be mounted to the switch unit and comprising:

an angle detector for detecting angular rotation of the switch unit from an initial position relative to the faucet body, and for generating angle information corresponding to the angular rotation thus detected;

a microprocessor coupled electrically to said angle detector for receiving the angle information, for recording a cumulative time period within which the switch unit is in an open state, for calculating an outflow rate according to the angle information, and for calculating an outflow value according to the outflow rate and the cumulative time period, said microprocessor determining when the microprocessor is in a mechanical equilibrium state and said microprocessor generating an alert signal upon determining that the outflow value has reached a predetermined threshold; and

an alert unit coupled electrically to said microprocessor for receiving the alert signal and for generating an alert output in response to the alert signal; wherein said angle detector is a three-axis gravitational sensor, and the initial position is set after said microprocessor has entered a mechanical equilibrium state.

6. The monitoring device as claimed in claim 5 , wherein said alert unit includes a light emitting diode.

7. The monitoring device as claimed in claim 5 , further comprising a shell to be mounted detachably to the switch unit, and a circuit board disposed in said shell, said angle detector and said alert unit being disposed on said circuit board.

8. A monitoring method for implementation by a faucet that includes a faucet body, a switch unit coupled rotatably to the faucet body, and a monitoring device mounted to the switch unit and including a three-axis gravitational sensor, the monitoring method comprising the steps of:

i) configuring the monitoring device for performing initialization, followed by determining whether a proper connection between the monitoring device and the switch unit has been made;

ii) determining that the monitoring device is in a mechanical equilibrium state; and

iii) configuring the monitoring device for setting an initial position upon determining that the proper connection between the monitoring device and the switch unit has been made and that the monitoring device has entered a mechanical equilibrium state;

a) configuring the monitoring device for detecting angular rotation of the switch unit from an initial position relative to the faucet body, and for generating angle information corresponding to the angular rotation thus detected;

b) configuring the monitoring, device for recording a cumulative time period within which the switch unit is in an open state, and for calculating an outflow rate according to the angle information;

c) configuring the monitoring device for calculating an outflow value according to the outflow rate and the cumulative time period;

d) configuring the monitoring device for determining whether the outflow value has reached a predetermined threshold; and

e) configuring the monitoring device for generating an alert output upon determining that the outflow value has reached a predetermined threshold.

9. The monitoring method as claimed in claim 8 , wherein, in step e), the monitoring device is configured to generate a normal output upon determining that the outflow value has not yet reached the predetermined threshold.

10. The monitoring method as claimed in claim 8 , further comprising, after step e), the steps of:

iii) configuring the monitoring device for entering a standby mode; and

iv) configuring the monitoring device for reactivating from the standby mode a predetermined time period after the monitoring device has entered the standby mode.