alexfukahori/rpi-pwm-fan-control

This Python script was created for the purpose to control a PWM FAN Noctua NF-A4x20 5V, using Raspberry Pi 4B hardware features. The script use WiringPi-Python as a dependecy, it is used to set Hardware PWM value clock as 25Khz that was specified by Intel (c.f. “4-Wire Pulse Width Modulation (PWM) Controlled Fans”, Intel Corporation September 2005, revision 1.3), to read the FAN speed using the tachometer, it is read by using Hardware provided interruption pin. Using Hardware feature use less CPU to execute the work, avoiding to use Raspberry Pi CPU resource only to control the FAN speed.

rpi-pwm-fan-control's Issues

HW PWM

What is needed to run HW PWM? Just uncomment line 153 and comment 154?

Noctua PWM Voltage

According to some internet sources and noctua white paper, PWM should recieve 5V. RPi GPIO are only 3.3V.
Some people advice connecting 3.3 to 5V pull-up level shifters. What's your opinion on that?

pinMode PWM: Unable to do this when using /dev/gpiomem

I'm trying to run your code on my 4b and I'm getting the error in the title. Here's my buildlog.

~ $ git clone [email protected]:alexfukahori/rpi-pwm-fan-control.git### 
Cloning into 'rpi-pwm-fan-control'...
remote: Enumerating objects: 30, done.
remote: Counting objects: 100% (30/30), done.
remote: Compressing objects: 100% (28/28), done.
remote: Total 30 (delta 14), reused 3 (delta 0), pack-reused 0
Receiving objects: 100% (30/30), 8.58 KiB | 627.00 KiB/s, done.
Resolving deltas: 100% (14/14), done.
~ $ cd rpi-pwm-fan-control/
~/rpi-pwm-fan-control $ pip3 install -r requirements.txt
Could not open requirements file: [Errno 2] No such file or directory: 'requirements.txt'
~/rpi-pwm-fan-control $ dir
LICENSE  README.md  requirement.txt  rpi-pwmfan.py
~/rpi-pwm-fan-control $ pip3 install -r requirement.txt
Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
Collecting wiringpi==2.60.0 (from -r requirement.txt (line 1))
  Downloading https://files.pythonhosted.org/packages/06/bf/7c4ec17172f72917707dddeacfa02eae80b56ad3b7b5674a4258e62b2f5a/wiringpi-2.60.0-cp37-cp37m-linux_armv7l.whl (285kB)
    100% |████████████████████████████████| 286kB 552kB/s 
Installing collected packages: wiringpi
Successfully installed wiringpi-2.60.0
~/rpi-pwm-fan-control $ python3 ./rpi-pwmfan.py
PWM FAN control starting
pinMode PWM: Unable to do this when using /dev/gpiomem. Try sudo?
~/rpi-pwm-fan-control $ sudo python3 ./rpi-pwmfan.py
Traceback (most recent call last):
  File "./rpi-pwmfan.py", line 3, in <module>
    import wiringpi as wiringpi
ModuleNotFoundError: No module named 'wiringpi'

requirement.txt

isn't the list of requirements too broad?