This is a project of a digital locker based on ATM like otp based authentication mechanism.
- On Pressing Star (*) in the keypad, the Locker will send an OTP request to the server
- On server, an OTP will be generated and sent to the user via email and to the Locker via network
- On Entering Correct OTP, the servo motor will rotate and the locker will be unlocked
- Pressing D can remove the last entered digit while entering OTP
- There will be 3 chances to enter the specific OTP correctly. If that exceeds, the user has to request for a new OTP by pressing Star (*)
- The locker can request for new OTP maximum 3 times from the Server within any 15 minutes. If that exceeds, the locker will be banned by the server for more 15 minutes.
- After the Locker was unlocked, Hash (#) need to be pressed to Lock the locker again.
- NodeMCU Board
- Breadboard
- 4x4 Hex-keypad
- Jumperwires
- 5v Power Supply / Battery
- 5v Servo Motor
- A Computer/Laptop for setting up server
- NodeMCU and the server Computer Both should be connected to the same Wifi
- First Check the IP address of the server in the local network interface
- Put the IP address and all wifi credentials in the CryptoLocker.ino File at desired fields
- Install all required libraries in Arduino IDE
- Upload the code in NodeMCU
- Put the sender email credentials and a reciever email address in the server.py File at desired fields
- Install required libraries (NOTE: Python should be pre-installed)
pip install Flask
- Keep the server code running in the computer
| NodeMCU | Hex Keypad | Servo Motor | Details |
|---|---|---|---|
| D0 | PWM Pin (Orange Wire) | Sends PWM Signal to Rotate | |
| D1 | Row Pin 1 | Connects First Row | |
| D2 | Row Pin 2 | Connects Second Row | |
| D3 | Row Pin 3 | Connects Third Row | |
| D4 | Row Pin 4 | Connects Fourth Row | |
| D5 | Col Pin 1 | Connects First Coloumn | |
| D6 | Col Pin 2 | Connects Second Coloumn | |
| D7 | Col Pin 3 | Connects Third Coloumn | |
| D8 | Col Pin 4 | Connects Fourth Coloumn |
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The NodeMCU and the Servo motor should be connected to a 5v supply
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NOTE: It's better to connect the servo motor with a high current supply ( ~1A )