Arduino Pwm Fan Control

I am looking at getting 2 80x10mm pwm fans. The blue led seen on the prototype board is just for verifying correct circuit operation and also can be removed. 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.

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The system uses a temperature sensor to control four fans that are driven by an arduino controller.

Arduino pwm fan control.

There is some information out there. The temperature and fan speed are reported through a 8 digit 7 segment display fitted on a rack mounted aluminium bar. Controlling the fan was seemingly straightforward. I have been wondering about this project and how to control my 4 pin pwm fans.

4 wired fan control pwm control a pwm fan with arduino. Beginner full instructions provided 24 154. A question came up on irc regarding how to pwm a 3 pin pc fan with an arduino using analogwrite. I simply want to control a 4 wired fan or maybe several with an arduino board.

The noise made it impossible to measure the fan s rotation. However i am looking at controlling the fan speed with the arduino via the pwm pins. The ultimate project is to control the fan based on temperature. The circuit utilizes the mode 10 pwm phase correct on timer 1 ocr1a pin 9 and icr1 pin 10.

Getting temperature values from a digital or analog temperature sensor on an arduino is fairly simple. I had 5 laying around and thought mine as well give it a shot. It then becomes a matter of telling the fan pwm to raise or lower the speed based on the temperature. Control pwm fans with an arduino some basic c programming and a lot of fun.

I found the following diagram that seems to be what i am looking for in order to hook the fan up to the arduino. In this post we have described how to design temperature based fan speed control monitoring with arduino and lm35 temperature sensor. The problem was that the hall effect sensor or tach signal was incredibly noisy. The arduino throttles the fans using pid logic and drives them through pwm.

The frequency values can be adjusted between 125 hz 8 mhz as well as a variable duty cycle. Many projects that use a temp sensor but never the most simple thing. The microcontroller controls the speed of an electric fan according to the requirement allows dynamic and faster control and the lcd makes the system user friendly. Control the speed of the fan.

Temperature based fan speed control monitoring with arduino.

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