Final Project¶

So my final project is the digital anemometer. The idea is that the anemometer should measure speed of wind send it through RF to the PC.

WHAT DOES IT DO¶

Anemo is a device, that uses a hall effect sensor, magnet, wings and MCU to measure wind speed, then sends it to the PC using RF module. Below you can see the image.

WHO HAS DONE WHAT BEFOREHAND¶

There are lots of examples of digital anemometers, but the difference is that it should work with the set of anemometers.

WHAT DID YOU DESIGN¶

I designed PCB, wings to measure speed, a packaging box from acrylic and interface software to connect it with the PC.

PCB Design¶

This PCB is not the first version I was working on it in Output devices week also. After output, input and networking weeks I redesigned it and fixed all mistakes. For the hall effect sensor, I designed another PCB only for the sensor.

Below you can see the images of the main PCB milled and then assembled.

Then I designed a package box using an online box generator. And placed the 9V battery, main PCB and power switch in it.

For the wings, I used Freecad to design them.

Finally, when everything was assembled I wrote the code for Arduino and used the interface that I designed in Interface and application week. Also, I used my work from Input and Networking weeks. Below you can see the code.

#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>



//create an RF24 object
RF24 radio(9, 10);  // CE, CSN

//address through which two modules communicate.
const byte address[6] = "00001";

int hall_in = A0;

int val = 0;
int count = 0;
int mag_tick = 0;
float wind_speed = 0; 
bool passed = 0;


void setup()
{
  Serial.begin(9600);
  pinMode(13,OUTPUT);
  Serial.println(radio.begin());

  //set the address
  radio.openWritingPipe(address);

  //Set module as transmitter
  radio.stopListening();
}


void loop()
{
  val = analogRead(hall_in);
  //Serial.println(val);

  if(val > 511 && passed == false)
  {
    mag_tick++;
    passed = true;
  }
  else if(val <= 510 && passed == true)
  {
    passed = false;
  }
  count++;
  if(count >= 9000)
  {
    wind_speed = (float)mag_tick * 0.628;

    count = 0;
    //send speed with RF

    char text[32] = "";
    sprintf(text,"%d",(int)(wind_speed * 100));
    radio.write(text, sizeof(text));
    mag_tick = 0;
    PORTB = 32 - PORTB;

  }
  //delay(1);
}

WHAT MATERIALS AND COMPONENTS WILL BE USED¶

WHERE WILL THEY COME FROM¶

HOW MUCH WILL THEY COST¶

For all these questions I will write the BOM of materials.

Name	Value	Description	Price	Qty	Vendor
Capacitor	0.1u	1206 SMD Ceramic Capacitor	~0.1$	5	Digikey.com
Capacitor	22u	1206 SMD Ceramic Capacitor	~0.1$	1	Digikey.com
Capacitor	10n	1206 SMD Ceramic Capacitor	~0.1$	1	Digikey.com
LED	RED	1206 SMD LED	~0.1$	2	Digikey.com
POWER Jack		Connector:Barrel_Jack	~0.1$	1	Digikey.com
Resistors	1K,4.7Kx2,100R x2,470R	1206 SMD resistor	~0.1$	6	Digikey.com
Voltage Regulator	5V	LM2940 LDO 5V regulator	~0.5$	1	Digikey.com
Voltage Regulator	3.3V	LM3480 LDO 3.3V regulator	~0.5$	1	Digikey.com
MCU	Atmega328p	TQFP32 8Mhz 8 bit microcontroller	~1.5$	1	Digikey.com
RF module	NRF24L01	868Mhz radio tranceiver	~1.5 $	1	Online shop
Power Switch		ON/OFF RED switch	~0.5$	1	Online shop
Acrilic		3mm thickness, black 0.4mx0.15m	~3.5$		From shop in Yerevan
Duracell battery	9V		~2$	1	Any Shop in Armenia
PLA for 3D print		Color: Grey	~2.5$	0.3Kg	Online shop

WHAT PARTS AND SYSTEMS WERE MADE¶

The main PCB, package box, and wings.

WHAT PROCESSES WERE USED¶

3D printing(wings)
2D milling(PCB)
Laser cutting (Box)

WHAT QUESTIONS WERE ANSWERED¶

The accuracy of measurement. 0.62 m/s is the accuracy of the Anemometer
The distance of radio communication. Approximately 100m
Tolerance under strong wind. It can handle wind speeds up to 70km/h.
Is there an opportunity to use more sensors with the same MCU? Yes, there is many input/output pins that are free now and can be used for other sensors and output devices.

WHAT WORKED, WHAT DIDN’T?¶

The main parts of the project worked, for example, the rf module worked perfectly as well as the hall effect sensor, but I was planning to have more sensors like temperature, humidity, etc. Because of shortage of time, I didn’t manage to add those sensors.

HOW WAS IT EVALUATED¶

The project was evaluated in different stages. The first stage was evaluated by me. I checked all parameters, whether it measures correctly, is data received by PC is being stored in CSV file, etc. The Second stage was evaluated by Babken. He checked whether it meets all requirements of the task or not. And the final stage was the presentation to Neil.

Downloads¶

Final.zip file

License¶

CC BY: This license allows reusers to distribute, remix, adapt, and build upon the material in any medium or format, so long as attribution is given to the creator. The license allows for commercial use. CC BY includes the following elements: BY – Credit must be given to the creator

Last update: July 11, 2022