Data

Tools

Indexes

Applications

Experiments

Awesome

An open API service indexing awesome lists of open source software.

https://github.com/qppd/coconut-dryer

An intelligent coconut drying system designed for the Southern Luzon State University (SLSU) Lucban BSME program.
https://github.com/qppd/coconut-dryer

arduino-esp32 cplusplus dryer pid-algorithm solar-power

Last synced: about 1 month ago
JSON representation

An intelligent coconut drying system designed for the Southern Luzon State University (SLSU) Lucban BSME program.

Awesome Lists containing this project

README 

          
# Coconut Dryer



## Overview



An intelligent coconut drying system designed for the Southern Luzon State University (SLSU) Lucban BSME program. This Arduino-based embedded system provides automated temperature, humidity, and moisture control for efficient coconut drying operations using PID control algorithms and real-time sensor monitoring.



## Table of Contents



- [Features](#features)

- [System Architecture](#system-architecture)

- [Hardware Components](#hardware-components)

- [Software Dependencies](#software-dependencies)

- [Installation](#installation)

- [Usage](#usage)

- [Configuration](#configuration)

- [Project Structure](#project-structure)

- [3D Models and Manufacturing](#3d-models-and-manufacturing)

- [Technical Specifications](#technical-specifications)

- [Contributing](#contributing)

- [License](#license)

- [Developer](#developer)



## Features



### Core Functionality

- **Automated Drying Process**: PID-controlled temperature regulation for optimal drying conditions

- **Multi-Parameter Monitoring**: Real-time tracking of temperature, humidity, and moisture levels

- **Smart Control System**: Automatic shutdown when target moisture levels are achieved

- **User Interface**: 20x4 LCD display with intuitive menu navigation

- **Status Indicators**: Real-time system status and operational feedback



### Technical Features

- **PID Control Algorithm**: Precise temperature control using industry-standard PID implementation

- **Sensor Integration**: SHT31 temperature/humidity sensor and soil moisture monitoring

- **Relay Control**: Multiple solid-state relay (SSR) control for heating elements and fans

- **Push Button Interface**: Multi-button navigation system for parameter adjustment

- **Serial Monitoring**: Real-time debugging and monitoring via serial communication



## System Architecture



The system employs a modular architecture with separate components for different functionalities:



```

CoconutDryer.ino (Main Controller)

├── LCD_CONFIG.h (Display Management)

├── SHT31_CONFIG.h (Temperature/Humidity Sensor)

├── SOIL_MOISTURE_CONFIG.h (Moisture Monitoring)

├── RELAY_CONFIG.h (Actuator Control)

├── PID_CONFIG.h (Control Algorithm)

├── BUZZER_CONFIG.h (Audio Feedback)

├── PUSH_BUTTON_CONFIG.h (User Input)

└── LIB.h (Utility Functions)

```



## Hardware Components



### Essential Components

- **Microcontroller**: Arduino-compatible board (ESP32/Arduino Uno)

- **Display**: 20x4 I2C LCD (Address: 0x27)

- **Temperature/Humidity Sensor**: Adafruit SHT31 (I2C Address: 0x44)

- **Moisture Sensor**: Analog soil moisture sensor

- **Relays**: Multiple solid-state relays for heating elements and fans

- **User Interface**: Push button array for navigation

- **Audio Feedback**: Buzzer for system alerts



### Power Requirements

- Operating Voltage: 5V/12V (depending on relay configuration)

- Power Consumption: Variable based on heating element usage

- Backup Power: Optional battery backup for data retention



## Software Dependencies



### Arduino Libraries

```cpp

#include   // LCD display control

#include      // Temperature/humidity sensor

#include              // PID control algorithm

#include                // I2C communication

```



### Installation Requirements

- Arduino IDE 1.8.x or higher

- ESP32/Arduino board support packages

- Required libraries (installable via Arduino Library Manager)



## Installation



### Hardware Setup

1. **Circuit Assembly**: Connect components according to the provided schematic

2. **Sensor Calibration**: Calibrate moisture sensors for coconut-specific readings

3. **Relay Configuration**: Set up solid-state relays for heating elements and fans

4. **Display Connection**: Wire I2C LCD to appropriate pins



### Software Installation

1. **Clone Repository**:

   ```bash

   git clone https://github.com/qppd/coconut-dryer.git

   cd coconut-dryer

   ```



2. **Open Arduino IDE**: Load `source/CoconutDryer/CoconutDryer.ino`



3. **Install Dependencies**: Install required libraries via Library Manager



4. **Board Configuration**: Select appropriate board and port



5. **Upload Firmware**: Compile and upload to microcontroller



## Usage



### Initial Setup

1. **Power On**: Connect power supply and initialize system

2. **Calibration**: Allow sensors to stabilize (approximately 30 seconds)

3. **Parameter Setting**: Use push buttons to set desired parameters:

   - Temperature Setpoint: Default 60°C

   - Humidity Setpoint: Default 20%

   - Moisture Setpoint: Default 6%



### Operation Modes

- **Standby Mode**: System monitoring without active drying

- **Drying Mode**: Active temperature control and moisture monitoring

- **Completion Mode**: Automatic shutdown when target moisture is achieved



### Display Information

```

T:XX.X°C    SP:XX.X°C

H:XX.X%     SP:XX.X%

M:XX.X%     SP:XX.X%

Status: [Standby/Drying]

```



## Configuration



### PID Parameters

Located in `PID_CONFIG.h`:

```cpp

double THRESHOLD_1 = 4;   // Proportional gain

double THRESHOLD_2 = 0;   // Integral gain

double THRESHOLD_3 = 22;  // Derivative gain

```



### Sensor Calibration

Modify calibration constants in respective configuration files:

- SHT31: Temperature offset adjustment

- Moisture sensor: Analog-to-percentage conversion



### Operational Parameters

Default setpoints can be modified in main code:

```cpp

double TEMPERATURE_SETPOINT = 60;  // °C

double HUMIDITY_SETPOINT = 20;     // %

double MOISTURE_SETPOINT = 6;      // %

```



## Project Structure



```

coconut-dryer/

├── LICENSE                          # Project license

├── README.md                        # Project documentation

├── models/                          # 3D models and manufacturing files

│   ├── gcode/                      # G-code files for 3D printing

│   │   ├── Coconut_Dryer_Board_Mount.gcode

│   │   ├── Coconut_Dryer_Button_Lock.gcode

│   │   ├── Coconut_Dryer_Case_Cover.gcode

│   │   └── Coconut_Dryer_Case.gcode

│   └── stl/                        # STL files for 3D printing

└── source/                         # Source code

    └── CoconutDryer/              # Main Arduino project

        ├── CoconutDryer.ino       # Main program file

        ├── BUZZER_CONFIG.h        # Audio feedback configuration

        ├── LCD_CONFIG.h           # Display configuration

        ├── LIB.h                  # Utility functions

        ├── PID_CONFIG.h           # PID control configuration

        ├── PUSH_BUTTON_CONFIG.h   # Input handling

        ├── RELAY_CONFIG.h         # Actuator control

        ├── SHT31_CONFIG.h         # Temperature/humidity sensor

        ├── SOIL_MOISTURE_CONFIG.h # Moisture sensor configuration

        ├── include/               # Header files

        │   ├── LCDController.h

        │   ├── MoistureSensor.h

        │   ├── RelayController.h

        │   └── TemperatureHumiditySensor.h

        └── src/                   # Implementation files

            ├── LCDController.cpp

            ├── MoistureSensor.cpp

            ├── RelayController.cpp

            └── TemperatureHumiditySensor.cpp

```



## 3D Models and Manufacturing



### Available Models

The project includes complete 3D models for manufacturing:



- **Board Mount**: Secure mounting for electronic components

- **Button Lock**: User interface protection and organization

- **Case Cover**: Protective housing for the control system

- **Main Case**: Primary enclosure for all components



### Manufacturing Files

- **STL Files**: Ready for 3D printing on standard FDM printers

- **G-code Files**: Pre-sliced for common 3D printer configurations

- **Material Recommendations**: PLA or PETG for durability and temperature resistance



## Technical Specifications



### Operating Parameters

- **Temperature Range**: 0-100°C (sensor range)

- **Humidity Range**: 0-100% RH

- **Moisture Detection**: Analog sensing with percentage conversion

- **Control Precision**: ±0.1°C temperature control

- **Response Time**: <60 seconds for temperature stabilization



### Communication Interfaces

- **Serial**: 9600 baud rate for debugging and monitoring

- **I2C**: For sensor and display communication

- **Digital I/O**: Push button inputs and relay outputs



### Performance Characteristics

- **Loop Interval**: 500ms for real-time monitoring

- **PID Update Rate**: Synchronized with main loop

- **Display Refresh**: Real-time parameter updates

- **Auto-completion**: Moisture-based process termination



## Contributing



We welcome contributions to improve the Coconut Dryer project. Please follow these guidelines:



### Development Process

1. Fork the repository

2. Create a feature branch

3. Make your changes with proper documentation

4. Test thoroughly with hardware setup

5. Submit a pull request with detailed description



### Code Standards

- Follow Arduino coding conventions

- Document all functions and major code blocks

- Test with actual hardware before submission

- Maintain backward compatibility when possible



## License



This project is open source and available under the [MIT License](LICENSE).



## Developer



**Sajed Lopez Mendoza** - Full Stack Developer & IoT Specialist



### Professional Background

- **Location**: Unisan, Quezon Province, Philippines

- **Specialization**: Embedded Systems, IoT Development, Full-Stack Web Development

- **Experience**: Freelance Developer at QPPD (Quezon Province Programmers/Developers)

- **Education**: Southern Luzon State University (SLSU) Lucban



### Technical Expertise

- **Embedded Systems**: ESP32, Arduino, Raspberry Pi development

- **IoT Solutions**: Sensor integration, real-time monitoring systems

- **Hardware Integration**: 3D printing, PCB design, solar power systems

- **Programming**: C/C++, Python, JavaScript, PHP, Java

- **Machine Learning**: TensorFlow, AI-powered applications

- **Mobile Development**: Android applications with hardware integration



### Notable Projects

- **IoT Smart Fan**: Intelligent climate control system

- **IoT Bike Tracker**: Solar-powered GPS tracking solution

- **CNC Jog Trainer**: GRBL-based CNC machine controller

- **Smart Cabinet**: Advanced automated storage solution

- **Umbrella Holder**: PID-controlled drying system



### Contact Information

- **Email**: quezon.province.pd@gmail.com

- **GitHub**: [github.com/qppd](https://github.com/qppd)

- **Portfolio**: [sajed-mendoza.onrender.com](https://sajed-mendoza.onrender.com/)

- **Facebook**: [facebook.com/qppd.dev](https://facebook.com/qppd.dev)

- **Community**: [facebook.com/QUEZONPROVINCEDEVS](https://facebook.com/QUEZONPROVINCEDEVS)



---



**Project Status**: Finished | **Last Updated**: November 2025 | **Version**: 1.0