Embedded firmware for a portable AC controller built on an Arduino Nano. Features include user-selectable manual and automatic operation, SSD1306 OLED display, LM35 temperature sensing, and PID-based temperature regulation—all packaged in a compact, ready-to-build design.

• Microcontroller: Arduino Nano (ATmega328P, SMD)
• Display: 0.96″ SSD1306 OLED (128×64) over I²C
• Sensors: Two LM35 analog temperature sensors (internal & ambient)
• Controls:
  • Two SMD rotary potentiometers for manual blower and compressor control
  • Two momentary buttons (UP/DOWN) for setting the target temperature
  • A latching switch for Manual/Auto mode selection
• Outputs:
  • Blower and compressor controlled via PWM (D6, D5)
  • Condenser blower output always ON (D7)
  • LED indicator (D8) for system status
• Power: 15V input regulated to 5V using a 7805 regulator

portable-ac-controller/
├── .vscode/                 # VSCode settings
├── hardware/                # Hardware resources
│   ├── docs/
│   │   └── wiring_diagram.pdf          # High-level wiring diagram
│   ├── gerbers/
│   │   └── portable-ac-controller.ZIP  # Fabrication-ready Gerber files
│   └── images/
│       ├── FinalRender.JPG          # PCB 3D render
│       └── PCB.PNG                  # PCB layout top view
│
├── include/                # Header files
│   ├── ControlLogic.h
│   ├── DisplayManager.h
│   ├── Pins.h
│   └── TempSensors.h
│
├── lib/                    # Libraries
│
├── src/                    # Source files
│   ├── ControlLogic.cpp
│   ├── DisplayManager.cpp
│   ├── main.cpp
│   └── TempSensors.cpp
│
├── .gitignore
├── BOM.md                 # Full bill of materials
├── CONTRIBUTING.md        # Contribution guide
├── LICENSE                # MIT license
├── platformio.ini         # PlatformIO build config
└── README.md              # Project overview

• AUTO mode: Maintain internal temperature using PID control
• MANUAL mode: Independently adjust blower and compressor speeds
• Real-time internal temperature display (large digits)
• Temperature setpoint adjustment (16–27 °C) via buttons
• Interrupt-driven button handling with debouncing
• Clean, modular codebase with independent components

git clone https://github.com/dondfx/portable-ac-controller.git
cd portable-ac-controller

Open in PlatformIO IDE or use CLI:

pio run                             # Build project
pio run -e nanoatmega328 -t upload  # Upload to Arduino Nano

• Provide 15 V DC to the power input
• Observe LED indicator
• Press buttons, adjust pots, and watch temperature readings

• Bill of Materials: bom.md
• Contributing Guide: contributing.md

Feel free to submit improvements—feature suggestions, code enhancements, or updates to the hardware.

This project is licensed under the MIT License. See LICENSE for details.

arduino ac-controller embedded i2c ssd1306 pid platformio

Build, deploy, and stay cool! 😎