Introduction: Speed Detection With LinkIt One

With IR Sensor we can detect the speed of motor. I
have a small rover which is powered by Intel Edison and I was curious to know its speed so let us create a device that will detect the speed of a vehicle. In this application we will be using LinkIt One board. If you want to know more about LinkIt One you can go through the previous articles of this series-

Pointing the Spotlight on LinkIt ONE

Getting Started with LinkItOne

Getting Familiar with Arduino IDE: LinkItOne

Hello World With LinkIt One

Grove Starter Kit With LinkIt One

Step 1: Requirements

LinkItOne Board

IR Sensor

USB Cable

Step 2: IR Sensor

The reflectivity of infrared light varies with the color and distance of the reflecting surface. The Grove Infrared Reflective sensor is based on the same principle. It has a RPR220 reflective photosensor module which detects color and distance. When a light-colored object approaches, the signal intensity received by infrared reflective sensor increases and the indicator LED on board turns red. When a dark-colored object approaches, the intensity decreases and the LED turns off.

Step 3: Specifications

Voltage:4.5-5.5V

Current:14.69 - 15.35 mA

Effective Distance :4-15 mm

Detectable Length(black line) :1 mm

Step 4: Features:

Operating voltage: 4.5 V - 5.5 V

Digital output, 0 or VCC

High resolution sensor

Indicator LED on board

Sensitivity adjustable via potentiometer

Small Grove 1X1 compatible interface

Step 5: Connections

1) Connect LinkIt One to your computer using a USB A to micro B cable.

2) Connect the Infrared Reflective Sensor onto the D2 port of Grove Base Shield.

3) In the Arduino IDE, go to the Tools pull-down menu at the top, select Board, and make sure “LinkIt One” is checked.

4) Then pull down the Tools menu again, and select appropriate Serial Port.

If you have multiple serial ports to choose from and aren’t sure which to choose, try unplugging the board from your computer and plugging the board back again to see which port gets added.

Download the Timer Library from Arduino timer1 library and add it to Arduino Library folder. I have marked a black line on a circular piece of paper and attached it to a servo which is controlled by my Intel Edison so that sensor can get one signal when the circle rotates a round.

Step 6: Code

#include

unsigned int counter=0;

void blink()

{

counter++;

}

void timerIsr()

{

Timer1.detachInterrupt(); //disable the timer1

Serial.print("The speed of the motor: ");

Serial.print(counter,DEC);

Serial.println("round/s");

counter=0;

Timer1.attachInterrupt( timerIsr ); //enable the timer1

}

void setup()

{

Serial.begin(9600);

Timer1.initialize(1000000); // set a timer of length 1sec

attachInterrupt(0, blink, RISING); //INT0

Timer1.attachInterrupt( timerIsr ); // attach the service routine here

}

void loop()

{

; //do nothing

}

Step 7:

Open the Serial Monitor to read the data.

Step 8: Other Project Ideas With IR Sensors

Line-following robots

Rotary speed detection

Auto data logging on utility meters

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Bio: Pooja Baraskar is an Intel Software Innovator,author, speaker and a passionate Software Developer, who is always willing to learn and explore new technologies. Being ... More »
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