An automated industrial bag dispenser designed to reduce plastic waste through smart sensing and real-time weight/distance monitoring.

The project utilizes a Dual-MCU Architecture to ensure reliable, high-performance data processing:

• Master Controller (Arduino Uno): Orchestrates UI, ultrasonic sensing, and motor control.
• Sensor Node (Arduino Pro Micro): Dedicated high-precision weight acquisition and wireless transmission.

• Modular OOP Design: Hardware components are abstracted into C++ classes for high maintainability and clean encapsulation.
• Interrupt-Driven Real-Time Execution: Utilizes hardware interrupts for non-blocking, immediate response to physical sensor changes, optimizing CPU utilization.
• Dual-Sensor Logic: Deployment is triggered based on distance (ultrasonic) or bag weight thresholds.
• Wireless Data Link: Reliable wireless UART communication between controllers at 9600bps using specialized RF transceivers.
• Interactive UI: High-resolution TFT display showing real-time bag usage statistics via hardware SPI.

• Signal Noise & Debouncing: Handled mechanical sensor bounce and signal noise by implementing custom software debouncing algorithms and validation thresholds, preventing false interrupt triggers.
• Asynchronous Wireless Data Loss: Solved potential packet corruption over the wireless link by introducing packet availability checks (.available()) and tailored microsecond propagation delays to ensure the data buffer is fully populated before reading.
• Hardware-Software Integration: Utilized hardware serial monitoring to trace inter-MCU data flow and isolate logic bugs from physical connection issues.

├── Main_Controller_Uno/          # Master Node Code
│   ├── Main_Controller_Uno.ino   # Main execution loop & system setup
│   ├── DistanceSensor.h          # HC-SR04 Ultrasonic abstraction class
│   ├── BagDispenser.h            # L293D Motor control logic
│   ├── SmartScale.h              # UART Communication handler for weight data
│   └── DisplayManager.h          # ILI9341 TFT SPI Graphics abstraction
└── Weight_Sensor_ProMicro/       # Sensor Node Code
    └── Weight_Sensor_ProMicro.ino # Dedicated HX711 Load Cell reader & RF transmitter

• Languages: C++, Arduino
• Protocols: SPI (Display), Wireless UART (Inter-MCU), I2C-like (HX711)
• Components: HC-SR04, HX711 Load Cell, L293D Motor Driver, ILI9341 TFT, RF Transceivers.