Key determination method for metal key

1. A method for operating a metal key arranged on a user interface comprising a plurality of metal keys, said method comprising:

pressing the metal key;

determining that a press flag of the metal key is valid by determining a press model of the metal key and determining that the press model is consistent with a pre-set press model;

determining that values output by an electrical parameter converter on the metal key satisfy multiple levels of thresholds; and

in response to determining that the press model is consistent with the pre-set press model and the values output by the electrical parameter converter on the metal key satisfy the multiple levels of thresholds, setting the press flag of the metal key according to the multiple levels of thresholds.

2. The method of claim 1 , wherein;

a correlation between the values output by the electrical parameter converter and the multiple levels of thresholds is set; and

the multiple levels of thresholds correspond to different applications.

3. The method of claim 2 , wherein the electrical parameter converter is a digital electrical parameter converter.

4. The method of claim 1 , wherein the multiple levels of thresholds comprises thresholds, which are values that are dynamically set according to an output signal from a sensor.

5. The method of claim 1 , wherein the method further comprises;

instantaneously obtaining, at the metal key, a plurality of values output by the electrical parameter converter;

determining that the plurality of values output by the electrical parameter converter satisfy the multiple levels of thresholds;

determining a number of metal keys that obtain the values output by the electrical parameter converter; and

determining that the press flag is to be set in response to determining that the plurality of values output by the electrical parameter converter satisfy the multiple levels of thresholds as well as the number of metal keys that obtain the values output by the electrical parameter converter.

6. The method of claim 1 , wherein the method further comprises: determining that the values output by the electrical parameter converter satisfy the multiple levels of thresholds upon detecting that the press flag of the metal key is valid.

7. The method of claim 1 , wherein the method further comprises:

determining a duration for which the press flag of the metal key is set; and

determining that the duration is greater than a pre-set value, and in response, clearing the press flag of the metal key.

8. The method of claim 1 , wherein the method further comprises: upon releasing the metal key, determining that a release flag is valid according to a press model, and in response, clearing the press flag that was previously set.

9. The method of claim 8 , wherein, upon releasing the metal key, determining that the press model of the metal key is consistent with the pre-set press model, and in response, determining that the release flag is valid.

10. The method of claim 1 , wherein the pre-set press model is selected from the group consisting of: a monotonically increasing model, or a stepwise rising model, or a jitter raising model, and a combined model of any two of the monotonically increasing model, the stepwise rising model and the jitter raising model, or a combined model of the monotonically increasing model, the stepwise rising model and the jitter raising model.

11. The method of claim 1 , wherein the method comprises:

releasing the metal key; and

determining that a release flag of the metal key is valid according to a press model, and in response, clearing the press flag.

12. A metal key applying the method of claim 1 .

13. The method of claim 1 , wherein the multiple levels of thresholds comprises thresholds, which are pre-set values.

14. An electronic weighing instrument comprising:

a user interface;

a plurality of metal keys arranged at the user interface;

one or more processors; and

one or more non-transitory storage media comprising a stored program, which when executed, configures the one or more processors to:

receive data generated from a user pressing a given one of the plurality of metal keys;

determine whether a press flag of the given metal key is valid by determining a press model of the given metal key and by determining whether the press model is consistent with a pre-set press model;

determine whether values output by an electrical parameter converter on the given metal key satisfy multiple levels of thresholds; and

set the press flag of the given metal key according to the multiple levels of thresholds when the press model is consistent with a pre-set press model and the values output by the electrical parameter converter on the given metal key satisfy multiple levels of thresholds.

15. A non-transitory storage medium, comprising a stored program, wherein the stored program, upon execution, controls an apparatus comprising a metal key arranged on a user interface comprising a plurality of metal keys and the storage medium to:

receive data generated from a user pressing the metal key;

determine whether a press flag of the metal key is valid by determining a press model of the metal key and by determining whether the press model is consistent with a pre-set press model;

determine whether values output by an electrical parameter converter on the metal key satisfy multiple levels of thresholds; and

set the press flag of the metal key according to the multiple levels of thresholds when the press model is consistent with a pre-set press model and the values output by the electrical parameter converter on the metal key satisfy multiple levels of thresholds.