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Full Discussion: Very Basic Arduino Uno Board Testing
Top Forums Programming Very Basic Arduino Uno Board Testing Post 303042294 by Neo on Friday 20th of December 2019 10:29:42 AM
Old 12-20-2019
Here is a quick test with the same Arduino Uno with the I2C bus and the HC-SRO4 Ultrasonic Ranging Module

Very Basic Arduino Uno Board Testing-img_8698jpg


Very Basic Arduino Uno Board Testing-img_8693jpg


and the simple test sketch:

Code:
/*
  1602 LCD Display with I2C and HC-SRO4 Demo
  Created by Neo December 2019
  https://www.unix.com
*/
#include <LiquidCrystal_I2C.h>
const int i2c_addr = 0x27;    // bus address from LCD display
LiquidCrystal_I2C lcd(i2c_addr, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);
const int trigPin = 9;    //  HC-SRO4 trig
const int echoPin = 10;   //  HC-SRO4 echo
const int maxRange = 400; //  HC-SRO4 max range in cm
const int minRange = 2;   //  HC-SRO4 min range in cm
long duration;
float distanceCm, distanceInch;
void setup()
{
    lcd.begin(16, 2); // Initializes LCD screen and specifies chars (16) and rows (2)
    pinMode(trigPin, OUTPUT);
    pinMode(echoPin, INPUT);
}
void loop()
{
    digitalWrite(trigPin, LOW);
    delayMicroseconds(2);
    digitalWrite(trigPin, HIGH);
    delayMicroseconds(10);
    digitalWrite(trigPin, LOW);
    duration = pulseIn(echoPin, HIGH);
    distanceCm = duration * 0.034 / 2;
    distanceInch = duration * 0.0133 / 2;
    // Set range of HC-SRO4
    if (distanceCm > maxRange || distanceCm < minRange)
    {
        distanceCm = 0;
        distanceInch = 0;
    }
    //first row
    lcd.setCursor(0, 0); // Sets the cursor location
    lcd.print("Dist(cm): ");
    if (distanceCm > 0)
    {
        lcd.print(distanceCm, 1);
        lcd.print("     ");
    }
    else
    {
        lcd.print("         "); // easy clear :)
    }
    // second row
    lcd.setCursor(0, 1);
    lcd.print("Dist(in): ");
    if (distanceCm > 0)
    {
        lcd.print(distanceInch, 1);
        lcd.print("    ");
    }
    else
    {
        lcd.print("         "); // easy clear :)
    }

    delay(200);
}

 

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LEARN ABOUT DEBIAN

lcdscrub

lcdscrub(6x)							XScreenSaver manual						      lcdscrub(6x)

NAME

       lcdscrub - attempt to repair burn-in on LCD screens

SYNOPSIS

       lcdscrub [-display host:display.screen] [-visual visual] [-window] [-root] [-delay number] [-spread number] [-cycles number] [-fps]

DESCRIPTION

       This screen saver is not meant to look pretty, but rather, to repair burn-in on LCD monitors.

       Believe	it or not, screen burn is not a thing of the past.  It can happen to LCD screens pretty easily, even in this modern age.  However,
       leaving the screen on and displaying high contrast images can often repair the damage.  That's what this screen saver does.

       See also:

	    http://docs.info.apple.com/article.html?artnum=88343      http://toastycode.com/blog/2008/02/05/lcd-scrub/

OPTIONS

       -visual visual
	       Specify which visual to use.  Legal values are the name of a visual class, or the id number (decimal or hex) of a specific visual.

       -window Draw on a newly-created window.	This is the default.

       -root   Draw on the root window.

       -delay number
	       Per-frame delay, in microseconds.  Default: 1000000 (1 second.).

       -spread number
	       Distance between lines.	Default 8.

       -cycles number
	       Steps before switching display mode.  Default 60.

       -fps    Display the current frame rate and CPU load.

ENVIRONMENT

       DISPLAY to get the default host and display number.

       XENVIRONMENT
	       to get the name of a resource file that overrides the global resources stored in the RESOURCE_MANAGER property.

SEE ALSO

       X(1), xscreensaver(1)

COPYRIGHT

       Copyright (C) 2008 by Jamie Zawinski.  Permission to use, copy, modify, distribute, and sell this software and its  documentation  for  any
       purpose	is  hereby  granted without fee, provided that the above copyright notice appear in all copies and that both that copyright notice
       and this permission notice appear in supporting documentation.  No representations are made about the suitability of this software for  any
       purpose.  It is provided "as is" without express or implied warranty.

AUTHOR

       Inspired by the like-named program by Daniel Sandler.

       Written by Jamie Zawinski.

X Version 11							5.15 (28-Sep-2011)						      lcdscrub(6x)
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