Key determination method for metal key

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.

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.