Other Arduino Codes and Videos by Robojax

Display distance from Ultrasonic sensor as bargraph on LCD

Ultrasonic Sensor distance as bargraph

This video explains how to dispaly input voltage at A0 pin as bargraph on LCD1602-I2C and LCD2014-I2C display..
  1. Robojax LCD Bargraph Libaray (zip file)
  2. I2C Scanner
  3. Introduction to LCD1602-I2C with code
  4. Introduction to HC-SR04 Ultrasonic sensor
  5. Arduino You Know Course on Udemy

 /*
 * This Arduino sketch display distance measured 
 * using HC-SR04  as bargraph on LCD1602-I2C
 * 
 * Original library was taken from https://playground.arduino.cc/Code/LcdBarGraph/
 * Modified by Ahmad Shamshiri on May 26, 2019 at 04:53 in Ajax, Ontario, Canada
 * Visit http://robojax.com/learn/arduino for other Arduino codes
 * Watch YouTube video instruction for this code: https://youtu.be/V-o32As_Xv4
 * 
 * Robojax Arduino Course on Udemy where  you get Schematic Diagram of this sketch 
 * and many other robotics related lectures and codes. Purchase the course here: http://bit.ly/rj-udemy
 * 
 
 * This code is "AS IS" without warranty or liability. Free to be used as long as you keep this note intact.* 
 * This code has been download from Robojax.com
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <LcdBarGraphRobojax.h>


byte lcdNumCols = 16; // -- number of columns in the LCD
byte lcdLine = 2; // -- number of line in the LCD

LiquidCrystal_I2C lcd(0x3f,lcdNumCols,lcdLine); //0x3f is address for I2C
                  // to get I2C address, run I2C Scanner. 
                  //Link is provided (in same page as this code) at http://robojax.com/learn/arduino
LcdBarGraphRobojax lbg(&lcd, 16, 0, 0);  // -- creating 16 character long bargraph starting at char 0 of line 0 (see video)

#include <NewPing.h>

#define TRIGGER_PIN  11  // Arduino pin tied to trigger pin on the ultrasonic sensor.
#define ECHO_PIN     12  // Arduino pin tied to echo pin on the ultrasonic sensor.
#define MAX_DISTANCE 30 // Maximum distance we want to ping for (in centimetres). Maximum sensor distance is rated at 400-500cm.

NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE); // NewPing setup of pins and maximum distance.
int VCC2 = 2;// additional VCC(5) for device
void setup(){
  pinMode(VCC2, OUTPUT);// extra VCC for ultrasonic
  digitalWrite(VCC2, HIGH);//extra VCC is now HIGH (5V)
    
  // -- initializing the LCD
  lcd.begin();
  lcd.clear();
  lcd.print("Robojax"); 
  lcd.setCursor (0,1); //  
  lcd.print("Bargraph"); 
   
  // -- do some delay: some time I've got broken visualization
  delay(2000);
  lcd.clear();
}

void loop()
{
  int distanceCM = sonar.ping_cm();// get distance in cm
  int distanceIN = sonar.ping_in();// get distance in in
 
  rjx.clearLine(1);// clear line 1 to display fresh voltage value

  // -- draw bar graph from the analog value 
  rjx.drawValue( distanceCM, MAX_DISTANCE);
  // -- do some delay: frequent draw may cause broken visualization
 
  lcd.setCursor (0,1); //
  lcd.print("Distance:"); 
  lcd.setCursor (10,1); //
  lcd.print(distanceCM); // print
  lcd.setCursor (14,1); //  
  lcd.print("cm");   
 
  delay(100);
}
   

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