When your test scores are poor, you don't want it to be shared with your parents. You can use it to put your test paper in a box. If parents find that they need their book, parents will find it. The password will open it.
inspiration from:https://www.instructables.com/id/Key-Safe/ (Key Safe)
I add the led light from this project
Arduino Leonardo (Uno)
LCD panel 16x2
LED light (green, red)
Male to female jumper
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Step 1: Step 1 : Code
There is a CODE:
Download 4 system from the library
set your password
if you input the correct password the lock will open and green Led light will bright
if you input an incorrect password the lock will not open and red Led light will not bright
press * to delete your Input password press # input your password
Step 2: Step 2 : Circuit
Insert all wires into the correct position
Be careful Positive and negative, if you put incorrect your things will gut burn
Connection positive electrode to 5V
Connection negative electrode to GND
Step 3: Step 3 : the Box
Find the one box that you don't need it
Use your Utility knife to make shape what you want
And drawing on the box makes your box more pretty
Step 4: Step 4 : Assemble the Components
Use the type to place the item on the finishing box
Step 5: Step 5 : How to Use
Put things and turn the motor to lock
If you want to open, please press the correct password.
If you press the incorrect answer, the red LED will light up