Keypad Circuits

  

Circuits




Using eight digital inputs, this circuit simplifies decoding of the common membrane 4x4 keypad matrix and eliminates the traditional requirement of scanning rows or columns. Any X-Y switch matrix, ...

Interfacing hex keypad to arduino uno. Full circuit diagram, theory, working and program. The keypress is displayed in the serial monitor window of arduino IDE.

Interfacing hex keypad to 8051. AT89S51 is the microcontroller. Circuit diagram and assembly language program. Testing video also provided.

This is a pic based digital lock circuit and it used PIC16F628A. 16x2 LCD is used for the display the information and keypad is used for enter the code. (#) will clear the display and (*) will ente...

Motor speed control using arduino. PWM is used for controlling speed. Hex keypad is used for inputting the speed. Speed is controlled in sex steps.

Printed Circuit Boards (PCBs) contain tracks, pads, and other features, etched from copper sheets and laminated onto a non-conductive substrate. These etched features electrically connect electroni...


Electronic Keypad Lock Project using 8051 Microcontroller (At89C51) with circ...


Electronic security code lock system - Door Lock - Safe Lock


electronic safe with keypad entry and solenoid lock


FT-817 External Keypad - Demo