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Arduino Project Handbook by Mark Geddes

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PROJECT 22: KEYPAD ENTRY SYSTEM

IT’S TIME TO INTRODUCE A KEYPAD TO YOUR ARDUINO BY BUILDING A KEYPAD ENTRY SYSTEM.

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PARTS REQUIRED

• Arduino board

• Breadboard

• Jumper wires

• Tower Pro SG90 9g servomotor

• Green LED

• Red LED

• 4×4 membrane keypad

• 2 220-ohm resistors

LIBRARIES REQUIRED

• Keypad

• Servo

• Password

This project uses a 4×4 membrane keypad with a ribbon of eight wires running from the bottom, connected to a servo that sweeps to open a lock.

HOW IT WORKS

A keypad is basically a series of buttons that output a number or character ...

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