Keypad Circuits

  

Circuits


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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.

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.

On my current circuit (its a electronic poker chip device) currently the inputs are PTM which send out pulses, however, I would instead like to give the option for the user to input the amount they...

This simple circuit is the electronic version of the combination lock. Using the special purpose LS7220 digital lock IC, the circuit allows a 4 digit combination of your choice to activate a relay ...


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


Keypad Combination Lock Circuit


Arduino Mega keypad Eeprom Lcd Circuit