Sensor Logger 🖥️📊

A multi-threaded sensor logger written in C ⚡ that simulates temperature 🌡️, humidity 💧, and light 💡 sensors.

Data from each sensor is collected concurrently using POSIX threads and logged to a CSV file 📑 with timestamps ⏱️.

👉 This project is especially useful as a teaching tool and as a foundation for real-time applications in Embedded Linux 🐧, such as IoT devices, Raspberry Pi data loggers, or sensor gateways.

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📂 Project Structure

sensor-logger/
├── bin/                  # Executable + generated CSV logs
│   ├── sensor_logger     # Compiled binary
│   └── 2025-08-29 17:12:39.csv
├── include/              # Headers and implementations
│   ├── csv_logger.c
│   ├── csv_logger.h
│   ├── threads.c
│   └── threads.h
├── src/                  # Entry point
│   └── main.c
└── Makefile              # Build script

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⚙️ Features

• 🧵 Concurrent threads for:
  • 🌡️ Temperature sensor
  • 💧 Humidity sensor
  • 💡 Light sensor
  • 📑 CSV logger
• 🔒 Thread synchronization using pthread_mutex and pthread_cond
• 📊 CSV file output with timestamp-based filenames
• 🛠️ Easily extendable for real sensors (replace rand() with hardware drivers)
• ⚡ Designed with Embedded Linux real-time logging in mind

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🚀 Build & Run

1. Build the project

make

This will create the executable in bin/sensor_logger ⚙️.

2. Run the logger

./bin/sensor_logger

3. Output

The program generates a CSV log in the bin/ folder 📂 with the current timestamp ⏱️ as its filename.

Example content:

timestamp,temp,humidity,light
2025-08-29 17:12:41,25.00,60.00,128
2025-08-29 17:12:42,30.00,55.00,200
2025-08-29 17:12:43,28.00,70.00,90

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📦 Requirements

• 🖥️ GCC compiler
• 🧵 POSIX threads (pthread)

✅ Tested on:

• Ubuntu 22.04 🐧
• GCC 11+

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🛠️ Possible Improvements

• 🛑 Add graceful exit handling (e.g., stop threads on CTRL+C)
• ⚙️ Add configuration file for sampling rate
• 🌍 Replace simulated values with real sensor readings
• 📂 Add JSON/SQLite logging in addition to CSV

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📜 License

This project is licensed under the MIT License — feel free to use and modify it.