Course Content

In recent years, the retail sector has seen significant advancements through the integration of embedded systems and IoT technologies to improve the customer shopping experience. The Smart Trolley System aims to modernize conventional shopping methods by automating the billing process and reducing manual dependency at checkout counters. This project utilizes an ESP32 microcontroller integrated with an RFID module, IR sensor, I2C LCD display, servo motor, buzzer, and Blynk IoT platform to create a semi-autonomous smart shopping cart.

The core functionality revolves around identifying products using RFID tags. Each product has a unique RFID tag which, when scanned by the RFID reader embedded on the trolley, is recognized and processed. The ESP32 reads the UID from the tag and maps it to predefined product names and prices. These details are displayed on the LCD, and the bill is automatically updated in real time. The IR sensor is used to detect payment completion, while a push button allows customers to view their total purchase details. Once payment is confirmed, a servo motor operates a gate mechanism to allow the customer to exit, and the system resets for the next user.

The collected data, including total cost, number of items, and item names, is continuously sent to the Blynk cloud platform, allowing for remote monitoring and digital billing via smartphone. The use of a buzzer provides audio confirmation for scanning and payment status. The entire system is powered by a 12V lithium-ion battery and uses a DC converter to power various components like the ESP32 and sensors.

This project presents a cost-effective, real-time solution to reduce waiting times at checkout points and improve the overall shopping experience. It also demonstrates the integration of embedded systems with IoT and mobile applications, paving the way for future advancements in smart retail systems.

Components Used

1. ESP-32 MCU (Microcontroller Unit)

2. Power Supply

3. RFID Reader

4. IR Sensor

5. Button

6. LCD 16x2 I2C Display

7. Buzzer

8. Servo Motor

9. Blynk App (Mobile application)

10. Blynk Cloud (IoT platform/cloud service)