Open Access4 × 4 matrix keyboard interface circuit achieved by single port lines
Author(s) -
Lin Zhiqi,
Shi Xinrong
Publication year - 2016
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2015.3586
Subject(s) - chip , port (circuit theory) , capacitor , matrix (chemical analysis) , interface (matter) , engineering , electrical engineering , element (criminal law) , electronic engineering , computer hardware , computer science , voltage , materials science , composite material , pulmonary surfactant , gibbs isotherm , chemical engineering , political science , law
It is usual that eight pins is used to connect the single‐chip with 4 × 4 matrix keyboard by the method of scanning. A method without any other active element is raised. Only one pin, four capacitors and four resistances are used to connect the single‐chip with 4 × 4 matrix keyboard without any other chip and active element.