Capacitor induction type touch press-key and measuring method for touch press-key capacitor

Abstract

The invention relates to a capacitive sensitive type touch key based on MCU and a measuring method for the capacitance of the touch key. The touch keys are distributed on a PCB printed circuit and are respectively connected with a negative signal input end of a comparator and one end of a resistor RC; the other end of the RC is respectively connected with an output end of the comparator, a signal end of a timing counting module and one end of a R1 in a resistor ladder network; and the other end of the R1 is connected with a positive signal input end of the comparator. The invention has the advantages that (1) the capacitance touch sensitive technology is adopted to design the touch keys, the cost is low and the special sensor is not needed; (2) the power consumption is lower; (3) the sensitive type light touch can realize the output of the signals; (4) the realizing mode can be diverse and can realize positioning of precision; (5) the touch key can replace various mechanical keys, switches and proximity detectors; (6) the structure is simple and the wear resistance is good; and (7) as the traditional key is not used, the touch sensitive key can adopt a whole seamless panel, the dust prevention effect is excellent and the reliability of the product is improved.

Description

technical field [0001] The invention relates to a capacitance-sensing touch button and a method for measuring the capacitance of the touch button, which are mainly used for electronic product control and belong to the field of touch button manufacturing. Background technique [0002] At present, traditional mechanical buttons have the disadvantages of easy wear, complicated installation, and large changes due to environmental factors such as temperature, humidity, and dust; and piezoelectric thin-grind touch buttons are not only expensive, but also easy to damage, and are affected by temperature and humidity. , the value error of its output signal is large, which is easy to cause misoperation or immobility. Contents of the invention [0003] Design purpose: In order to avoid the deficiencies in the background technology, design a sensitive and accurate capacitive-sensing touch key and a method for measuring the capacitance of the touch key that uses a PCB printed circuit a...

AI Technical Summary

Problems solved by technology

[0002] At present, traditional mechanical buttons have the disadvantages of easy wear, complicated installation, and large changes due to environmental factors such as temperature, humidity, and dust; and piezoelectric thin-grinding touch buttons are not only expensive, but also easy to damage, and are affected by temperature and humidity. , the value error of its output signal is large, which is easy to cause misoperation or immobility

Images