How do you wire a 4 wire computer fan?

How do you wire a 4 wire computer fan?

However, the 4-wire fan is a little different as it has the fourth ‘control’ wire to input a signal to the fan that commands it to speed up or speed down….4-wire fans explained.

1 Black GND (0V)
2 Yellow +12V
3 Green Sense/Tach
4 Blue Control/PWM

Can an Arduino run a fan?

Step 2: Connect the Arduino to the fan Connect 12V to the Plus pin of the fan, GND to the Minus pin of the fan and a PWM pin, for example pin 3 of the Arduino to the Speed pin of the fan.

What are the four wires on a computer fan?

A 4-wire fan has power, ground, a tach output, and a PWM-drive input. PWM, in brief, uses the relative width of pulses in a train of on-off pulses to adjust the level of power applied to the motor. A 2-wire fan is controlled by adjusting either the dc voltage or pulse width in low-frequency PWM.

Are all 4 pin fans PWM?

All 4 pin fan headers are NOT PWM. It has become common practice to use 4 pin headers these days, but Asus for example reports that their 4 pin headers for example are NOT PWM…..

How does a 4 pin fan work?

How Does a 4-Pin PWM Fan Work? PWM can be used as a form of voltage control, and that’s exactly what it does for a PWM fan. The fan rotates according to the voltage supplied through the PWM control pin. It is also a way of providing better and smarter control for thermal management of the motherboard.

How does Arduino control ceiling fan speed?

AC Fan Speed Control using Arduino and TRIAC

  1. Components Required.
  2. Working of AC fan control using Arduino.
  3. Zero-Crossing Detector.
  4. Phase Angle controlling Circuit.
  5. Potentiometer to control the Fan Speed.
  6. PWM Signal Generation Unit.
  7. Circuit Diagram.
  8. Programming the Arduino for AC fan speed control.

How do 4 pin fans work?

Can I control a 4-wired fan with an Arduino board?

I simply want to control a 4-wired fan (or maybe several) with an Arduino board. There is some information out there. Many projects that use a temp sensor, but never the most simple thing: control the speed of the fan.

What is a control 4 wire fan with control input?

4-wire fans with control input provide the ability to regulate the RPM of the fan without changing the input voltage delivered to the fan it. A variable RPM allows the cooling rate to be adjusted to meet demand, silencing the fan and saving energy when full speed is not required

What are the connection standards for a 4-wire fan?

Intel developed connection standards for 4-wire fans. Following is the connector pin out and wire color code of a typical 4-wire fan. Signal description is included as well. Here, GND is 0V and +12V is the positive supply for the fan. Sense (tachometer/tacho) delivers two pulses per revolution of fan.

What is the PWM Input wire on a fan?

The PWM input wire (blue) has no role in the play as it’s merely soldered to a vacant copper track of the circuit board (see below). Furthermore, you can see that the fan driver chip is a 4-pin chip CR211 which’s a very cheap 2-phase dc motor driver for 3-wire BLDC fans.