🍓 Raspberry Pi Pico Mini-Projects Collection

A collection of practical CircuitPython projects for the Raspberry Pi Pico, demonstrating integration with various sensors, displays, and actuators.

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🌡️ 1. Temperature & Humidity Monitor

A real-time environmental monitor that alerts users when conditions go beyond comfortable limits.

📝 Overview

Displays real-time temperature and humidity readings on an OLED screen. If the temperature exceeds 28°C or humidity exceeds 58%, a buzzer alerts the user.

🛠️ Components

• Raspberry Pi Pico
• OLED Display (128x32)
• DHT11 Sensor
• Buzzer

🔌 Wiring Diagram

Component	Pin	Pico GPIO
OLED	SDA	GP0
	SCK	GP1
DHT11	OUT	GP2
Buzzer	+	GP3

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🔒 2. Safe Lock System

An infrared-based security system that detects unauthorized access to a safe.

Safe Locked	Safe Violated

📝 Overview

Monitors the safe door using an IR sensor. When the door is opened, the system triggers an alarm and increments an "intrusion counter" displayed on the OLED screen.

🛠️ Components

• Raspberry Pi Pico
• OLED Display (128x32)
• IR (Infrared) Obstacle Sensor
• Buzzer

🔌 Wiring Diagram

Component	Pin	Pico GPIO
OLED	SDA	GP0
	SCK	GP1
IR Sensor	OUT	GP2
Buzzer	+	GP3

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🚪 3. Smart Door Control System

An automated entry system offering hands-free operation and feedback.

📝 Overview

Uses an ultrasonic sensor to detect presence at the door.

1. Detection: If someone is in range -> Buzzer beeps & OLED shows "Someone Outside".
2. Action: Press the button to open the door (Servo rotates 90°).
3. Auto-Close: Door closes automatically after 5 seconds.

🛠️ Components

• Raspberry Pi Pico
• OLED Display (128x32)
• HC-SR04 Ultrasonic Sensor
• Servo Motor (SG90)
• Push Button
• Buzzer

🔌 Wiring Diagram

Component	Pin	Pico GPIO
OLED	SDA	GP0
	SCK	GP1
Button	OUT	GP2
Buzzer	+	GP3
Servo	SIG	GP4
Ultrasonic	ECHO	GP20
	TRIG	GP21

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🚀 Getting Started

Prerequisites

1. CircuitPython Firmware: Install the latest CircuitPython uf2 on your Pico.
2. Libraries: Copy the lib folder from this repository to your Pico's lib folder. This contains essential drivers for the OLED, DHT11, and Servo.

Installation

1. Clone this repository.
2. Choose a project script (e.g., Door Control System.py).
3. Rename the chosen script to code.py and copy it to the root of your Pico.
4. The project will start automatically!

🤝 Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

📄 License

This project is open-source.