Add SmartCash documentation

versioned_docs/version-acs_cc/project/projects-2026/smartcash/index.md

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+# SmartCash – Intelligent Cash Register System
+
+A smart cash register with product scanning, real-time alerts, and business monitoring features.
+
+---
+
+## info
+
+- **Author:** David Adrian-Mario  
+- **Group:** 331 CC  
+- **GitHub Project Link:** 
+
+---
+
+## Description
+
+SmartCash is an intelligent cash register system designed to modernize small retail operations by integrating product scanning, real-time alerts, and smart monitoring features.
+
+The system runs on a microcontroller platform and connects to a barcode scanner, display interface, and alert modules. It allows fast product identification, automatic price calculation, and detection of unusual events such as suspicious transactions, missing products, or system errors.
+The device features a display interface that provides clear and real-time information to the user, including product name, price, and total cost. Additionally, the system includes a buzzer and LED-based alert mechanism that notifies the operator in case of errors, invalid scans, or unusual activities.
+
+To enhance functionality, SmartCash can optionally communicate with a computer, allowing storage of transaction logs and management of product databases. This makes the system scalable and adaptable for more advanced retail applications.
+
+Overall, SmartCash improves efficiency, reduces human error, and provides a more reliable and user-friendly solution for handling transactions in small retail environments.
+
+---
+
+## Motivation
+
+I chose this project because I am familiar with how markets and small shops operate, and I noticed that many systems are outdated and rely heavily on manual work. This leads to mistakes, slow service, and lack of control.
+
+The goal is to build a smarter cash register that improves efficiency, reduces errors, and provides real-time alerts.
+Additionally, this project allowed me to explore the practical side of embedded systems development by integrating both hardware and software components into a single functional system. Working with peripherals such as barcode scanners, displays, and communication interfaces helped me better understand how real-world devices operate.
+
+Another important motivation was the possibility to design a system that can be extended in the future. SmartCash can evolve into a more complex solution by adding features such as inventory management, cloud connectivity, or mobile integration.
+
+Overall, this project combines a real-world problem with a technical challenge, making it both useful and educational.
+
+---
+
+## Architecture
+
+The system is composed of the following main components:
+
+- **Main Controller** – handles product processing, scanning logic, and alerts  
+- **Scanning Module** – reads barcode data and sends it to the controller  
+- **Display Module** – shows product information and total price  
+- **Alert Module** – buzzer and LEDs for notifications  
+
+All components communicate through the microcontroller, which acts as the central processing unit.
+
+---
+
+## Log
+
+### Week 5 – 11 May
+Defined the project idea and overall architecture.
+
+### Week 12 – 18 May
+Started hardware setup and tested barcode scanner and display.
+
+### Week 19 – 25 May
+Implemented scanning logic and alert system.
+
+---
+
+## Hardware
+
+The project uses:
+- Microcontroller (STM32 / Arduino / Raspberry Pi Pico)  
+- Barcode scanner  
+- LCD / TFT display  
+- Buzzer  
+- LEDs  
+- Buttons  
+- Breadboard and wires  
+
+---
+
+## Schematics
+          +--------------------+
+          |  Barcode Scanner   |
+          |    (USB / UART)    |
+          +---------+----------+
+                    |
+                    v
+          +--------------------+
+          |                    |
+          |  Microcontroller   |
+          |  (STM32 / Pico)    |
+          |                    |
+          +----+----+----+-----+
+               |    |    |
+               |    |    |
+               v    v    v
+
+     +-----------+  +-----------+  +-----------+
+     |  Display  |  |  Buzzer   |  |   LEDs    |
+     | (LCD/TFT) |  |  (PWM)    |  |  (GPIO)   |
+     +-----------+  +-----------+  +-----------+
+
+               ^
+               |
+       +-------+-------+
+       |    Buttons    |
+       |    (GPIO)     |
+       +---------------+
+
+               ^
+               |
+       +---------------+
+       |      PC       |
+       | (Logs / DB)   |
+       +---------------+
+
+---
+
+## Bill of Materials
+
+| Device | Usage | Price |
+|------|------|------|
+| Microcontroller (STM32 / Pico / Arduino) | Main processing unit | ~50 RON |
+| Barcode Scanner | Product scanning | ~70 RON |
+| LCD / TFT Display | User interface | ~80 RON |
+| Passive Buzzer | Audio alerts | ~10 RON |
+| LEDs | Visual alerts | ~10 RON |
+| Buttons | User interaction | ~5 RON |
+| Jumper Wires (M-F, F-F) | Connections between components | ~20 RON |
+| Breadboard | Prototyping connections | ~10 RON |
+| USB Cable | Power and communication with PC | ~15 RON |
+
+---
+
+## Software
+
+| Library | Description | Usage |
+|--------|------------|------|
+| embedded-hal | Hardware abstraction layer | Communication with peripherals |
+| display driver (ILI9341 / ST7789) | Display control | UI rendering |
+| serial / UART library | Serial communication | Barcode scanner input |
+| GPIO library | Digital input/output control | Buttons and LEDs |
+| PWM library | Pulse-width modulation | Buzzer control |
+| SPI library | Serial Peripheral Interface | Communication with display |
+| I2C library | Sensor communication | Future extensions (sensors) |
+
+---
+
+## Links
+