This is a simple way to make 1x4 keypad membrane to work
You Will need
1 - 1x4 Keypad Membrane
4 - 10k ohm resistor (any watts preferably 1/4)
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Step 1: Connections
Here is the connection diagram.
Step 2: The Code
download the code then paste it to the arduino ide
you can see the output in the Arduino IDE Serial Monitor