## Step 1: Parts and Components

• Arduino Uno board
• 330 Ohm resistor = 10 Nos
• Bargrpah display
• 1 K ohm potentiometer

## Step 2: Schematic

• The bargraph display is connected to the Arduino (2,3,4,5,6,7,8,9,10,11) digital IO pins through 330 ohm current limiting resistors.
• The potentiometer is connected to the Arduino ADC (A0) pin for simulating the signal strength.
• The potential read by the 10 bit ADC, (1024 steps ) is mapped to 0 to 10 scale and correspondingly activating the LED’s at the Bargraph display in increasing order.
• Real life scenario, the signal strength is read by the ADC, accordingly bargraph is activated for visual representation.

## Step 3: Software

```/*  LED bar
graph  Turns on a
series of LEDs based on the value of an analog sensor.  This is a simple
way to make a bar graph display. Though this graph  uses 10
LEDs, you can use any number by changing the LED count  and the
pins in the array.  This method
can be used to control any series of digital outputs that  depends on
circuit:   * LEDs
from pins 2 through 11 to ground created 4
Sep 2010 by Tom Igoe This example
code is in the public domain. http://www.arduino.cc/en/Tutorial/BarGraph */// these constants won't change:const int analogPin = A0;   // the pin that the potentiometer is
attached toconst int ledCount = 10;    // the number of LEDs in the bar graphint ledPins[] = {  2, 3, 4, 5,
6, 7, 8, 9, 10, 11};   // an
array of pin numbers to which LEDs are attachedvoid setup() {  // loop
over the pin array and set them all to output:  for (int
thisLed = 0; thisLed < ledCount; thisLed++) {
pinMode(ledPins[thisLed], OUTPUT);  }}void loop() {  // read the
potentiometer:  int
result to a range from 0 to the number of LEDs:  int
ledLevel = map(sensorReading, 0, 1023, 0, ledCount);  // loop
over the LED array:  for (int
thisLed = 0; thisLed < ledCount; thisLed++) {    // if the
array element's index is less than ledLevel,    // turn
the pin for this element on:    if
(thisLed < ledLevel) {
digitalWrite(ledPins[thisLed], HIGH);    }    // turn
off all pins higher than the ledLevel:    else {
digitalWrite(ledPins[thisLed], LOW);    }  }}```
<p>These style bar graphs are really great for quick visual outputs. You can even use the remaining pins to setup multiplexing so that you can use multiple bar graphs at once.</p>