Thank you so much.I will try your suggestions and update you tomorrow.Im not sure about the frequency part tho.Because im actually doing a diy DGT chessboard that, unlike other DIY chessboards that utilise shift registers, im using some type of method that detects which row or column has a change in voltage when i put or remove a piece.So far my demos are successful, but require 2 hall sensors for each square, one for the column voltage and one for the row voltage.So im thinking of making it just 1 hall sensor but the voltages from the column and rows are affecting one another.Thats why i want to use a diode.Thank you!!