PROJECT 22: KEYPAD ENTRY SYSTEM
IT’S TIME TO INTRODUCE A KEYPAD TO YOUR ARDUINO BY BUILDING A KEYPAD ENTRY SYSTEM.
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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