Simple script to control a PWM fan on a Raspberry Pi based on CPU temperature.
https://the-diy-life.com/connecting-a-pwm-fan-to-a-raspberry-pi/
Debian GNU/Linux 11 (Linux 6.1.21) (bullseye) on aarch64 Raspberry Pi 4 Model B Rev 1.2
Bullseye version. Fix unstable by rolling back the firmware update [rpi-update] to the stable version.
sudo apt-get install --reinstall raspberrypi-bootloader raspberrypi-kernel
cat /sys/class/thermal/thermal_zone0/temp
FanProportional is less noise. The FanStepped script ramps up the fan speed in steps.
cd ~
git clone https://github.com/Binhatgit/PWMFanControl.git
cd PWMFanControl
sudo cp FanStepped.py /usr/local/sbin
chmod +x /usr/local/sbin/FanStepped.py
sudo cp FanStepped.service /etc/systemd/system/
systemctl daemon-reload
systemctl enable --no-pager FanStepped.service
systemctl restart --no-pager FanStepped.service
systemctl status --no-pager FanStepped.service
sudo nano /usr/local/sbin/FanStepped.py
sudo systemctl stop --no-pager FanStepped.service
sudo systemctl restart --no-pager FanStepped.service && sudo systemctl status --no-pager FanStepped.service
sudo systemctl restart --no-pager FanStepped.service
sudo systemctl status --no-pager FanStepped.service
systemctl stop --no-pager FanStepped.service
systemctl disable --no-pager FanStepped.service
sudo cp FanProportional.py /usr/local/sbin
chmod +x /usr/local/sbin/FanProportional.py
sudo cp FanProportional.service /etc/systemd/system/
systemctl start --no-pager FanProportional.service
systemctl enable --no-pager FanProportional.service
systemctl restart --no-pager FanProportional.service
systemctl start --no-pager FanProportional.service
systemctl status --no-pager FanProportional.service
sudo systemctl start FanProportional.service
sudo systemctl status FanProportional.service
nano /etc/systemd/system/FanProportional.service
nano /usr/local/sbin/FanProportional.py
sudo python3 read_fan_speed.py
vcgencmd measure_temp
wget https://raw.githubusercontent.com/ssvb/cpuburn-arm/master/cpuburn-a53.S
gcc -o cpuburn-a53 cpuburn-a53.S
./cpuburn-a53
Board layout
Fan pin
|.........................|
| Raspi chip 1 | 2 +5v |
| |....| | 4 +5v |-----> +5V
| |....| | 6 GND |-----> GND
| | |
| | |
| | |
| 33 | |-----> Tachometer - fan speed (BCM 13)
| 35 | |<----- PWM for Fan drive speed (BCM 19)
| | 37 |
| | 39 |
|.........................|
Read current pinout status
gpio readall
+-----+-----+---------+------+---+---Pi 4B--+---+------+---------+-----+-----+
| BCM | wPi | Name | Mode | V | PHYSICAL | V | Mode | Name | wPi | BCM |
+-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
| | | 3.3v | | | 1 || 2 | | | 5v | | |
| 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |
| 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |
| 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | IN | TxD | 15 | 14 |
| | | 0v | | | 9 || 10 | 1 | IN | RxD | 16 | 15 |
| 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |
| 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |
| 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |
| | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |
| 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |
| 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |
| 11 | 14 | SCLK | IN | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |
| | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |
| 0 | 30 | SDA.0 | IN | 1 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |
| 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |
| 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |
| 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |
| 19 | 24 | GPIO.24 | OUT | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |
| 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |
| | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
+-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
| BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
+-----+-----+---------+------+---+---Pi 4B--+---+------+---------+-----+-----+
