Fancontrol-Optiplex-3050-Micro/README.md

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:

   chmod +x fan_control.sh