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.

Arduino pwm fan control.

The frequency values can be adjusted between 125 hz 8 mhz as well as a variable duty cycle. However i am looking at controlling the fan speed with the arduino via the pwm pins. In this post we have described how to design temperature based fan speed control monitoring with arduino and lm35 temperature sensor. Temperature based fan speed control monitoring with arduino.

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. The temperature and fan speed are reported through a 8 digit 7 segment display fitted on a rack mounted aluminium bar. I simply want to control a 4 wired fan or maybe several with an arduino board.

The ultimate project is to control the fan based on temperature. Control the speed of the fan. 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.

The system uses a temperature sensor to control four fans that are driven by an arduino controller. Many projects that use a temp sensor but never the most simple thing. Controlling the fan was seemingly straightforward. Control pwm fans with an arduino some basic c programming and a lot of fun.

Beginner full instructions provided 24 154. 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. There is some information out there.

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. The noise made it impossible to measure the fan s rotation. I found the following diagram that seems to be what i am looking for in order to hook the fan up to the arduino.

The arduino throttles the fans using pid logic and drives them through pwm.