Arduino Pwm Fan Control

I simply want to control a 4 wired fan or maybe several with an arduino board.

Arduino pwm fan control.

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. However i am looking at controlling the fan speed with the arduino via the pwm pins. 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. It then becomes a matter of telling the fan pwm to raise or lower the speed based on the temperature. Many projects that use a temp sensor but never the most simple thing. In this post we have described how to design temperature based fan speed control monitoring with arduino and lm35 temperature sensor.

I have been wondering about this project and how to control my 4 pin pwm fans. Beginner full instructions provided 24 154. Controlling the fan was seemingly straightforward. The temperature and fan speed are reported through a 8 digit 7 segment display fitted on a rack mounted aluminium bar.

A question came up on irc regarding how to pwm a 3 pin pc fan with an arduino using analogwrite. Getting temperature values from a digital or analog temperature sensor on an arduino is fairly simple. Temperature based fan speed control monitoring with arduino. 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. The noise made it impossible to measure the fan s rotation. Control the speed of the fan. There is some information out there.

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

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.