Linux服务器opi3b温控风扇-优快云博客

本文链接：https://blog.youkuaiyun.com/2401_86161528/article/details/145234675

通过gpio控制风扇，监测CPU温度，解决pwm风扇异响、频繁开关的问题。

1.电路设计

使用了S8550 PNP三极管，gpio低电平时风扇开启。

gpio高电平时3.3v，经实验S8050 NPN三极管无法驱动5v风扇

2.编写脚本

在/opt/中创建fan/fan.sh:

#!/bin/bash

# Pin number
fan=25
# The temperature at which the fan starts to work, in millimeters Celsius
on=60000
# The temperature at which the fan stops working, in millimeters Celsius
off=45000
#Whether it works forever, 0 is not
#forever=1

#Set the pin mode
gpio mode $fan out

while true
do
    # Read the temperature
    read temp</sys/class/thermal/thermal_zone0/temp

    if ((temp>=on))
    then
        # On
        gpio write $fan 0
        #echo "on"
    elif ((temp<=off))
    then
        # Off
        gpio write $fan 1
        #echo "off"
    fi

    # Check whether it works forever
    #if ((forever==0))
    #then
        #break
    #fi
    sleep 10s
done

3.开机自启

创建fan.service

#Add permissions
sudo chmod +x /opt/fan/fan.sh
#Create by vim editor
sudo vim /etc/systemd/system/fan.service

添加

[Unit]
Description=Fan Control Script

[Service]
ExecStart=/opt/fan/fan.sh

[Install]
WantedBy=multi-user.target

回到命令行

#add to the configuration file
sudo systemctl daemon-reload
#Start when turned on
sudo systemctl enable fan
#Start now
sudo systemctl start fan
#Check the status
sudo systemctl status fan
#Test
sudo apt install stress
stress -c 50

以下是自动安装脚本：

install.sh

```bash

#!/bin/bash

# Get the directory where the script is located

SCRIPT_DIR="$(dirname "$0")"

# Ensure fan.sh has executable permissions

if [ ! -x "$SCRIPT_DIR/fan.sh" ]; then

echo "Setting fan.sh to be executable..."

sudo chmod +x "$SCRIPT_DIR/fan.sh"

# Copy fan.service to /etc/systemd/system

if [ ! -f /etc/systemd/system/fan.service ]; then