June 2016
Intermediate to advanced
272 pages
5h 4m
English
For centuries clandestine groups have used secret knocks to prevent unauthorized entry. Let’s bring this system into modern times, by creating our own electronic gatekeeper.


PARTS REQUIRED
• Arduino board
• Breadboard
• Jumper wires
• Tower Pro SG90 9g servomotor
• Piezo buzzer
• 3 LEDs
• 1M-ohm resistor
• 3 220-ohm resistors
LIBRARIES REQUIRED
• Servo
In this project, you’ll make a circuit that moves a servo arm to unlock a box or door when you provide the correct secret knock. So far we’ve been using ...
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