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Creating an Arduino-based smart shopping trolley with features like adding/deleting items and auto billing with GSM SMS alert involves several components and steps. Here's a high-level overview of how you can build such a system:

Components Needed:

1. Arduino board (e.g., Arduino Uno or Arduino Mega)
2. GSM module (e.g., SIM900)
3. RFID reader
4. RFID tags or NFC cards
5. LCD display
6. Keypad
7. Load cells or weight sensors
8. Servo motor (for automatic door opening, if desired)
9. Relays and transistors (for controlling the door and billing system)
10. Power supply
11. Breadboard and jumper wires
12. Shopping cart with a sturdy frame

Steps to Build the System:

1. Setup Arduino and GSM Module:
• Connect the GSM module to the Arduino.
• Install necessary libraries for the GSM module.
• Configure the GSM module to send and receive SMS alerts.

2. Interface RFID Reader:
• Connect the RFID reader to the Arduino.
• Write code to read RFID/NFC tags and associate them with product data.

3. Interface LCD Display and Keypad:
• Connect the LCD display and keypad to the Arduino.
• Use the keypad to input item codes or quantities.
• Display item details and prices on the LCD.

4. Implement Add/Delete Functionality:
• Create functions to add and delete items from the shopping cart.
• Maintain a list of selected items with their quantities.

5. Auto Billing System:
• Calculate the total bill based on the selected items and their prices.
• Display the total on the LCD.
• Implement a billing mechanism that accepts payment (e.g., cash or card).

6. Weight Sensing (Optional):
• If you want to automate item addition based on weight, use load cells or weight sensors.
• Add items to the cart when they are placed on the trolley, and remove them when taken out.

7. Automatic Door Control (Optional):
• Use a servo motor to control the trolley's door.
• Automatically open the door when an item is added or when the billing process is complete.

8. GSM SMS Alerts:
• Send SMS alerts using the GSM module to a predefined number.
• Send alerts for items added, deleted, or when the billing is completed.

9. User Interface and Interaction:
• Implement a user-friendly interface on the LCD for item selection, deletion, and payment.
• Provide feedback and prompts to guide the user through the process.

10. Testing and Debugging:
• Test the entire system thoroughly to ensure all components work as expected.
• Debug any issues with RFID reading, item tracking, billing, or GSM communication.

11. Power Supply and Integration:
• Ensure a reliable power supply for the Arduino and all components.
• Integrate the system into the shopping cart securely.

12. User Manual and Documentation:
• Create a user manual or guide explaining how to use the smart shopping trolley.

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