# Dell OptiPlex 3050 Micro Fan Control Script

This Bash script provides simple, temperature-based fan control for the **Dell OptiPlex 3050 Micro**. It's designed to reduce idle fan noise by lowering the fan speed when the system is cool, while still ramping it up appropriately under load.

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## 📋 Overview

By reading CPU temperature from the system's `hwmon` interface and adjusting the fan speed via PWM (pulse-width modulation), this script allows you to override the default, often overly aggressive fan behavior.

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## ⚙️ How It Works

1. **Monitors CPU Temperature**
   - Reads from: `/sys/class/hwmon/hwmon1/temp1_input`  
     *(Path may vary depending on your system — adjust as needed.)*

2. **Controls Fan Speed**
   - Writes PWM values to: `/sys/class/hwmon/hwmon2/pwm1`  
     *(This controls the fan speed. Also may vary.)*

3. **Temperature-Based Fan Speed Logic**

   | Temperature (°C) | Fan Speed (PWM) | Approximate Speed |
   |------------------|------------------|--------------------|
   | < 50°C           | 25               | ~25%               |
   | 50–59°C          | 45               | ~50%               |
   | 60–64°C          | 60               | ~75%               |
   | 65–74°C          | 120              | High               |
   | ≥ 75°C           | 255              | Maximum            |
   | ≥ 85°C           | 255 + warning    | Emergency max speed|

4. **Failsafe Mechanism**
   - If temperature exceeds **85°C**, the fan is forced to maximum and a message is logged to `/dev/kmsg`.

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## 🧪 Requirements

- A Linux system with PWM-capable fan control (`/sys/class/hwmon/...`)
- Root access to write PWM values
- Adjusted system paths if `hwmon1` and `hwmon2` differ on your machine

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## 🚀 Usage

1. Make the script executable:

   ```bash
   chmod +x fan_control.sh