Arduino Bluetooth PC Fan Wind Sensor With RemoteXY

This projects is a mix of two of my main passions, Arduino and Wind. Here is a simple project that I used this OLD PC fan as a small wind generator to sense the wind speed.

Here we are using modified PC fan as a wind speed sensor using Arduino and showing the results on a smartphone running the RemoteXY application.

Background

The PC Fan is a brushless DC motor and has a permanent magnet. Normally, a DC motor with a permanent magnet can act also as a generator without any modification as you turn the rotor.

But the PC Fan is brushless DC motor with an electronic commutator.

The Magnet is the rotor and the coils are the stator. In motor operation, the rotating magnetic field is generated by the electronic commutator circuit.

As you start to rotate the PC Fan blades, the magnet also rotates and produces voltage inside the stator coils.

But the problem is that the electronic commutator circuit blocks the induced voltage from getting outside the PC Fan terminals as it only acts in one direction (from the terminals to the coil and not the other way).

The main idea behind the modification is the removal of the electronic commutator IC and connect the terminals to the coils to take the induced voltage from the PC Fan as a generator.

The modified PC Fan can generate small voltage (about 3 to 4 volts) and it’s enough to light an LED or charge your smartphone. So you can call it a PC Fan Wind Turbine.

Here are detailed steps and videos on the modification process.

https://www.instructables.com/id/Old-PC-Fan-Wind-Turbine-in-10-Minutes/

Supplies:

PC Fan wind Turbine

This is a modified PC Fan that can generate small voltage (about 3-4 Volts)

Arduino UNO Banggood, ebay , Aliexpress

Bluetooth Module HC-06 Banggood, ebay, Aliexpress

Wires Crocodile Clips

Smartphone running RemoteXY application

Step 1: ​Components Used

PC Fan wind Turbine

This is a modified PC Fan that can generate small voltage (about 3-4 Volts)

Arduino UNO Banggood, ebay, aliexpress

Bluetooth Module HC-06 Banggood, ebay, aliexpress

Wires

Crocodile Clips

Smartphone running RemoteXY application

Step 2: ​Connection of the Circuit

Connect PC Fan to A5 (Arduino Analog Input)

Connect Bluetooth Module HC-06 to Arduino

Vcc to Vcc

GND to GND

TX to 2

RX to 3

Step 3: ​RemoteXY Interface

Open RemoteXY.com website.

Download RemoteXY to your smartphone.

Open RemoteXY Editor and Create new project.

Click Configuration

Click Connection and Choose Bluetooth

Click Module and Choose HC-06

Click Device and Choose Arduino Uno

Click IDE and Choose Arduino IDE

On the Module interface the Connection type to be Software Serial and Choose Connections 2 RX and 3 TX

Choose the default baud rate to be 9600

From Indication,

Add Level Meters and customize them as you like.

Add the text box tool.

From Decoration,

Add labels and customize its text and colors.

From View,

Change the interface background and you like to be.

Step 4: ​Arduino Code

On the RemoteXY website save your project and click Get Source Code button.

Copy the generated Software and paste it into Arduino IDE.

Add the following lines of the code in loop() function to use the level meters and the text box.

RemoteXY.level_1 = ( analogRead(sensorPin) /5 ) ;

RemoteXY.level_2 = analogRead(sensorPin);

dtostrf(analogRead(sensorPin), 0, 1, RemoteXY.text_1);

Download the RemoteXY library and add it to the Arduino environment.

Compile the software, connect Arduino UNO board and upload the code to Arduino UNO.

Step 5: ​Test the Circuit

Now you have a complete circuit and you can test it in the wind.

Power the Arduino Circuit.

On the smartphone,

• Open the RemoteXY app.

• Enable Bluetooth.

• Connect to your HC-06 Module.

You can see the fan rotate and the Level meter is moving. Also the Analog input text box responding.

Step 6: ​Notes

• The voltage generated from the PC Fan is small and will not hurt the Arduino analog input pin. But if you’re concerned about that you need to connect a regulator or a voltage divider circuit.

• You can change the coefficient multiplied by the analog input to get the wind speed.

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Backyard Wind Turbines