Many projects that use a temp sensor but never the most simple thing.
Arduino nano pwm fan control.
Led brightness control using arduino.
Temperature control with pid on arduino and pwm fans for diy server network rack cooling a few weeks ago i needed to setup a rack with network devices and a few servers.
There is some information out there.
Beginner full instructions provided 24 154.
For something that could perhaps work with the arduino you could build a circuit to convert the tacho output into a voltage and read it via the adc.
According to the link here.
The circuit utilizes the mode 10 pwm phase correct on timer 1 ocr1a pin 9 and icr1 pin 10.
I have been wondering about this project and how to control my 4 pin pwm fans.
I simply want to control a 4 wired fan or maybe several with an arduino board.
Control the speed of the fan.
If they are pwm take a small flat headed screwdriver and pull the pwm pin out of the fan connector by pushing the metal part on top and pulling it back.
Controlling the led brightness using arduino and motor speed control using arduino.
The frequency values can be adjusted between 125 hz 8 mhz as well as a variable duty cycle.
Firstly make sure that you fan s are pwm controller you can check this by making sure that your fan connector has 4 wires.
I decided that i would like to have a programmable temperature based fan speed controller for a fume extractor i am building from scrap parts and the logical thing to do seemed to be to use an arduino nano as modern fans use a 5 volt pwm signal to control their speed and also report back their speed with another 5 volt signal.
I had 5 laying around and thought mine as well give it a shot.
The rack is placed in a closed garage so the temperature range between winter and summer is pretty high and also dust could be a problem.
How pc fans work the three wire fan uses it s third wire to provide speed feedback tacho.
Hi nicolas if you want to do it accurately as david says you ll need different hardware.
In the above wave forms you can see that the frequency is same but on time and off time are different two applications of pwm control using arduino is shown here.
The arduino digital pins either gives us 5v when turned high or 0v when turned low and the output is a square wave signal.
