Portable Arduino Weighing Machine with Set Weight Option for Retail Packing

The Portable Arduino Weighing Machine is built around an Arduino Nano microcontroller that coordinates input from a 10 kg load cell and displays weight readings on an I2C LCD 16x2 screen. When an object is placed on the scale, the 10 kg load cell physically deforms slightly, causing a tiny electrical resistance change in its internal strain gauges. Because these analog voltage changes are extremely small, they are sent to the HX711 amplifier module, which precisely measures the signal and converts it into digital data that the Arduino Nano can read using the HX711_ADC library. The Arduino processes this digital weight value and shows it on the LCD screen via I2C communication. Users can interact with the system using push buttons to set a target weight option. If the measured weight reaches or exceeds the target weight, the Arduino triggers LEDs and a buzzer to alert the user. The entire circuit is assembled on a common dotted perfboard and housed inside a custom enclosure made from PVC and plastic boards. Power is supplied by a 7.4V battery, and an LM7805 voltage regulator steps this voltage down to a steady 5V to safely power the Arduino Nano, display, and sensors without causing damage.