Designing a smart mobile phone charging locker with 40 doors and code locks involves creating a secure and efficient charging solution for multiple users. Here's a conceptual outline for such a system:

Key Features and Components:

40 Charging Doors: Individual lockable compartments with charging ports to accommodate multiple devices.
Code Lock System: Each door equipped with a code lock for secure access control.
Central Control Panel: Centralized control panel for managing locker access and monitoring charging status.
LED Display: Display panel showing locker availability, instructions, and status updates.
Multiple Charging Ports: Include various charging ports (USB, Type-C, etc.) to support different devices.
Remote Monitoring: Capability to monitor locker status, charging sessions, and system performance remotely.
Payment Integration: Provide payment options for users to access charging services (e.g., coins, cards, mobile payments).
Real-time Status Updates: Display real-time information on charging status and locker availability.
Custom Branding: Allow for customization of the locker design and interface to match the branding of the location.