Secret Code Box Full Kit with Arduino Uno R3 Compatible Board
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Prices updated: 13 Oct 2026
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About this product
Complete kit for building a secret code box around an Arduino Uno R3 compatible board (ATmega328P). The 4x4 keypad receives the code, and the sketch compares it with the stored password. A correct code turns the servo to open the lock and lights a green LED. A wrong code sounds a buzzer three times. Educational, not a real security lock.
Specifications
- Board
- Arduino Uno R3 compatible (ATmega328P)
- Keypad
- 4×4 matrix (16 keys)
- Servo
- SG90 micro servo
- Kit version
- Full kit (with board)
- Recommended age
- 10–12 years
- Level
- Early intermediate
- Soldering
- No
- Estimated build time
- About 1.5 hours
Frequently asked questions
Is a USB cable needed to upload the code?
Yes. The board is programmed over USB from a computer using the Arduino IDE. The listing states the board is supplied without a USB cable, so a USB-A to USB-B cable of the type used with Arduino Uno is needed.
Does the keypad need a library?
Yes. The project reads the matrix keypad with the Keypad library, and compares the entered text with the password using string comparison.
