Arduino Pwm Fan Control

Controlling the fan was seemingly straightforward. The ultimate project is to control the fan based on temperature. The noise made it impossible to measure the fan s rotation.

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It then becomes a matter of telling the fan pwm to raise or lower the speed based on the temperature.

Arduino pwm fan control.

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 uses a temperature sensor to control four fans that are driven by an arduino controller. A question came up on irc regarding how to pwm a 3 pin pc fan with an arduino using analogwrite. The blue led seen on the prototype board is just for verifying correct circuit operation and also can be removed.

However i am looking at controlling the fan speed with the arduino via the pwm pins. Temperature based fan speed control monitoring with arduino. The arduino throttles the fans using pid logic and drives them through pwm. The temperature and fan speed are reported through a 8 digit 7 segment display fitted on a rack mounted aluminium bar.

I have been wondering about this project and how to control my 4 pin pwm fans. Many projects that use a temp sensor but never the most simple thing. There is some information out there. I simply want to control a 4 wired fan or maybe several with an arduino board.

I found the following diagram that seems to be what i am looking for in order to hook the fan up to the arduino. Control pwm fans with an arduino some basic c programming and a lot of fun. Getting temperature values from a digital or analog temperature sensor on an arduino is fairly simple. 4 wired fan control pwm control a pwm fan with arduino.

The frequency values can be adjusted between 125 hz 8 mhz as well as a variable duty cycle. I am looking at getting 2 80x10mm pwm fans. In this post we have described how to design temperature based fan speed control monitoring with arduino and lm35 temperature sensor. Control the speed of the fan.

The circuit utilizes the mode 10 pwm phase correct on timer 1 ocr1a pin 9 and icr1 pin 10. 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. I had 5 laying around and thought mine as well give it a shot. The problem was that the hall effect sensor or tach signal was incredibly noisy.

Beginner full instructions provided 24 154.

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