Choco Matic

Abstract

The rising demand for high-quality, customized chocolate bars has driven the need for small- scale, automated production solutions. This project presents the design and implementation of a chocolate bar production line that incorporates a fully automated chocolate tempering machine and a topping system for nuts and raisins. The system integrates three microcontrollers an Arduino Mega 2560 for production line control, an ESP32 for managing the tempering machine and wireless app connectivity, and an Arduino Uno for monitoring filling levels and driving additional LCD displays. Key features include a PT100 temperature sensor for precise heating, a 1950W heating element controlled via SSR, ultrasonic sensors for topping level monitoring, and mode-selection keypads for both chocolate type and topping. Chocolate dispensing and topping systems are actuated using NEMA23 stepper motors, while a windshield-wiper motor drives the conveyor belt. Additionally, real-time feedback is provided through LCD displays, and the entire system can be operated manually or remotely via a mobile application. Thermal behavior and energy usage were modeled using fundamental heat transfer formulas, ensuring reliable tempering with realistic time estimates. The project aims to deliver a scalable, energy-efficient, and user- friendly solution suitable for artisan or semi-industrial chocolate production environments.