1 1N4001 diode; 10 1N4148 diodes; 4 2n2222 ... The input circuit is a simple keypad matrix. To read each button push, the Arduino brings one keypad input line high and checks the voltage of the ...

Electronic, Arduino enthusiasts and makers looking for a project to keep them busy this weekend, may be interested in a cool custom switch created by Dave Skip to main content Skip to secondary menu ...