Arduino Pwm Fan Controller

Pwm fan controller sketch can be downloaded here.

Arduino pwm fan controller.

It is efficient because the pass transistor is used as a switch. The system uses a temperature sensor to control four fans that are driven by an arduino controller. The pwm controller accepts the control signal and adjusts the duty cycle of the pwm signal according to the requirements. Beginner full instructions provided 24 154.

I have been wondering about this project and how to control my 4 pin pwm fans. There is some information out there. As long as the cooling is on the red led is on when not cooling the green led is on. 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.

Design schematic diagram is shown next. The frequency values can be adjusted between 125 hz 8 mhz as well as a variable duty cycle. The ultimate project is to control the fan based on temperature. Firstly make sure that you fan s are pwm controller you can check this by making sure that your fan connector has 4 wires.

Temperature based fan speed control monitoring with arduino. There is a jumper for switching the power supply from arduino or the 12v input. I o pin 9 on the arduino board is directly connected to fan control input and by reading the state of 3 push buttons on pins 2 3 4 different pwm values are sent to the fan. The system works by an application running on the pc checking the cpu temperature and checking whether to speed up or slow down the fans.

I simply want to control a 4 wired fan or maybe several with an arduino board. I had 5 laying around and thought mine as well give it a shot. The arduino throttles the fans using pid logic and drives them through pwm. The blue led seen on the prototype board is just for verifying correct circuit.

Control the speed of the fan. Pwm waves with various duty cycle are shown in the figure below. 4 wired fan control pwm control a pwm fan with arduino. The pc communicates with the arduino via the serial port.

Many projects that use a temp sensor but never the most simple thing. The temperature and fan speed are reported through a 8 digit 7 segment display fitted on a rack mounted aluminium bar. A low frequency pulse width modulation pwm signal whose duty cycle is varied to adjust the fan s speed is used. For this reason i used arduinos d6 pin pwm.

Getting temperature values from a digital or analog temperature sensor on an arduino is fairly simple. How to connect it. So after that no electricity flows through it turning the fan off.