Project Overview

The Smart Coffee Dispensing & Inventory Management Platform was developed as a complete embedded automation solution for commercial coffee dispensing systems.

The platform enables customers to select their preferred coffee type through a wireless HDMI touch display while the system automatically controls dispensing, measures the exact coffee weight using load cells, and manages inventory across multiple coffee silos.

Built around a distributed ESP32 architecture, every dispensing module communicates wirelessly using ESP-NOW while remaining connected to the central controller through industrial RS-232 communication, creating a scalable and reliable smart dispensing system.

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Client Requirements

The client required a system capable of:

• Managing up to 16 coffee silos.
• Wireless communication between all dispensing units.
• Precision coffee dispensing based on weight.
• Automatic motor control.
• Servo-controlled silo gates.
• Real-time inventory monitoring.
• Wireless HDMI user interface.
• Industrial reliability.
• Modular expansion.
• Remote diagnostics.
• Power management.
• Continuous commercial operation.

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Our Solution

Metanoia designed and developed a complete intelligent dispensing platform including:

• Custom ESP32 Motherboard.
• Distributed ESP32 Node Boards.
• ESP-NOW Wireless Network.
• Industrial RS-232 Communication.
• Precision Load Cell Measurement.
• Servo Gate Control.
• Motor Driver Modules.
• HDMI Wireless User Interface.
• RGB Status Indicators.
• Power Management System.
• Modular PCB Design.

The system combines wireless communication, intelligent dispensing, precise weight measurement, and industrial automation into a scalable commercial solution.

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Main Features

Intelligent Coffee Selection

Customers interact with a wireless HDMI touchscreen to:

• Select coffee type.
• Choose dispensing quantity.
• Monitor dispensing progress.
• Receive system notifications.

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Distributed ESP-NOW Network

Each coffee silo contains its own ESP32 controller.

All controllers communicate through ESP-NOW, providing:

• Fast communication.
• Low latency.
• Reliable wireless networking.
• Scalable architecture.

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Central Management Controller

A custom motherboard coordinates all dispensing units, synchronizes operations, manages inventory, and communicates with every module using industrial RS-232 interfaces.

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Precision Weight Control

Each dispenser uses a load cell to continuously measure coffee output.

Once the required weight is reached:

• Motor stops automatically.
• Dispensing gate closes.
• Final weight is confirmed.

This ensures high dispensing accuracy with minimal waste.

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Servo-Controlled Gates

Each silo uses dedicated servo motors to precisely open and close dispensing gates for accurate product flow.

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Smart Inventory Monitoring

The controller continuously tracks:

• Remaining coffee quantity.
• Active silos.
• Dispensing status.
• Refill requirements.
• Machine health.

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RGB Status Indicators

Each coffee silo includes RGB lighting to indicate:

• Ready
• Dispensing
• Empty
• Error
• Maintenance

allowing operators to identify system status instantly.

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Industrial Communication

The platform combines:

• ESP-NOW Wireless Communication
• RS-232 Industrial Communication

to provide both flexibility and reliable machine-to-machine networking.

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Power Management

Dedicated power circuitry provides stable operation for:

• ESP32 Controllers
• Motors
• Servos
• RGB Lighting
• Sensors
• Communication Modules

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Engineering Challenges

Distributed Wireless Architecture

Designing multiple ESP32 controllers that operate simultaneously while maintaining reliable synchronization.

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Precision Dispensing

Developing weight-based control algorithms capable of stopping dispensing with high accuracy.

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Inventory Management

Tracking product levels across multiple silos in real time.

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Commercial Reliability

Designing electronics capable of continuous operation in retail and industrial environments.

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Modular Expansion

Supporting future expansion from 6 silos to 16 or more without redesigning the platform.

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Development Process

1. System Architecture

The complete dispensing workflow and communication topology were designed.

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2. Hardware Development

Custom PCBs were developed for:

• Main Controller
• Silo Controllers
• Power Distribution
• Sensor Interfaces

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3. PCB Design

Production-ready PCBs were optimized for modular installation and industrial operation.

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4. Embedded Firmware

Firmware manages:

• ESP-NOW Communication
• RS-232 Communication
• Motor Control
• Servo Control
• Load Cell Processing
• Inventory Monitoring
• RGB Lighting
• Diagnostics

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5. User Interface

A wireless HDMI interface provides intuitive control and real-time system monitoring.

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6. System Validation

The complete platform underwent extensive testing for communication reliability, dispensing accuracy, long-term operation, and commercial performance.