Using A Bar Graph With The Arduino

Introduction

This project explores a couple of ways of simulating and using a bar graph with the Arduino. Bar graph components like the following one can be used,

Bar Graph

This type of bar graph is basically just 10 LEDs in a row with anodes on one side of the component and cathodes on the other.

The same thing can be created by just placing 10 LEDs on a breadboard. If you have LEDs smaller than 5mm, you may be able to get them closer together on the breadboard. If not, just space out as you see in the diagrams.

You Will Need

  • 10 x LEDs or 1 x 10 Segement Bar Graph
  • 10 x 330 Ohm Resistors
  • 10K Trimmer Potentiometer
  • 1 x Piezo Buzzer

Making The Circuit – Bar Graph

The first job is to connect up all of those LEDs and resistors to make the bar graph.

Bar Graph schemetic

Programming The Arduino – Bar Graph

Here is some code to test that the bar graph has been wired correctly.

int ledPin[] = {1,2,3,4,5,6,7,8,9,10};
void setup()
{
for (int i =0;i<10;i++)
{
pinMode(ledPin[i], OUTPUT);
}
}

void loop()
{
upanddown();
delay(1000);
oneatatime();
delay(1000);

}
void alloff()
{
for (int i =0;i<10;i++)
{
digitalWrite(ledPin[i], LOW);
}
}

void allon()
{
for (int i =0;i<10;i++)
{
digitalWrite(ledPin[i], HIGH);
}
}

void showUpTo(byte numtoshow)
{
alloff();
for (byte i = 0;i<numtoshow;i++)
{
digitalWrite(ledPin[i],HIGH);
}

}
void upanddown()
{
for (int i =0;i<10;i++)
{
digitalWrite(ledPin[i], HIGH);
delay(100);
}
for (int i=9;i>=0;i–)
{
digitalWrite(ledPin[i], LOW);
delay(100);
}
}
void oneatatime()
{
for (int i =0;i<10;i++)
{
digitalWrite(ledPin[i], HIGH);
delay(100);
digitalWrite(ledPin[i], LOW);
delay(100);
}
}

Making The Circuit – Trimpot

Adding a trimpot to control the bar graph allows the bar graph to be used as an indicator for the position of the potentiometer.

 

For more detail: Using A Bar Graph With The Arduino

 


About The Author

Ibrar Ayyub

I am an experienced technical writer with a Master's degree in computer science from BZU Multan University. I have written for various industries, mainly home automation, and engineering. I have a clear and simple writing style and am skilled in using infographics and diagrams. I am a great researcher and is able to present information in a well-organized and logical manner.

Follow Us:
LinkedinTwitter
Scroll to Top