Very Basic Arduino Uno Board Testing


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# 15  
Setting up the 1602 was easy, following this very easy tutorial:

Code:
https://dronebotworkshop.com/lcd-displays-arduino/

It looks pretty cool and retro, especially turning the display on and off (which you cannot see in the photos, needs video):

Very Basic Arduino Uno Board Testing-img_8690jpg


Very Basic Arduino Uno Board Testing-img_8691jpg


Very Basic Arduino Uno Board Testing-img_8692jpg


That was fun....

I need to add some retro sounding robot voice.... Smilie
# 16  
For completeness, here is the sketch I used for the 1602 demo above:


Code:
/*
  LCD Display with I2C Interface Demo
  lcd-i2c-demo.ino
  Use NewLiquidCrystal Library
  DroneBot Workshop 2018
  https://dronebotworkshop.com
  Modified by Neo December 2019
  https://www.unix.com
*/

// Include Wire Library for I2C
#include <Wire.h>
// Include NewLiquidCrystal Library for I2C
#include <LiquidCrystal_I2C.h>

// Define LCD pinout
const int en = 2, rw = 1, rs = 0, d4 = 4, d5 = 5, d6 = 6, d7 = 7, bl = 3;

// Define I2C Address - change if reqiuired
const int i2c_addr = 0x27;

LiquidCrystal_I2C lcd(i2c_addr, en, rw, rs, d4, d5, d6, d7, bl, POSITIVE);

void setup()
{

    // Set display type as 16 char, 2 rows
    lcd.begin(16, 2);

    // Print on first row
    lcd.setCursor(0, 0);
    lcd.print("Hello Neo!");

    // Wait 1 second
    delay(1000);

    // Print on second row
    lcd.setCursor(0, 1);
    lcd.print("How are you?");

    // Wait 8 seconds
    delay(8000);

    // Clear the display
    lcd.clear();
}

void loop()
{

    // Demo 1 - flash backlight
    lcd.setCursor(0, 0);
    lcd.print("Do you need unix");
    lcd.setCursor(0, 1);
    lcd.print("or linux help ??");

    delay(3000);
    lcd.clear();

    // Flash backlight 4 times
    for (int i = 0; i < 6; i++)
    {
        lcd.backlight();
        delay(250);
        lcd.noBacklight();
        delay(250);
    }

    // Turn backlight back on
    lcd.backlight();

    // Demo 2 - scroll
    lcd.setCursor(0, 0);
    lcd.print("Visit UNIX.com @");
    delay(4500);
    lcd.setCursor(0, 2);
    lcd.print("www.unix.com  ");
    delay(2500);
    // set the display to automatically scroll:
    lcd.autoscroll();
    // print from 0 to 9:
    for (int thisChar = 0; thisChar < 15; thisChar++)
    {
        lcd.print(' ');
        delay(500);
    }
    // turn off automatic scrolling
    lcd.noAutoscroll();

    // clear screen
    lcd.clear();

    //Delay
    delay(1000);
}

So fun... really... I had no idea playing with the Arduino could be so much fun.

Last edited by hicksd8; 12-20-2019 at 08:06 AM..
This User Gave Thanks to Neo For This Post:
# 17  
I notice from your photos that you are relying on USB power only so far. You have no direct PSU plugged into the Arduino.

So a word of warning as you get into adding stuff to your projects that, before going off on any tangents to investigate why the Arduino crashed, you couldn't upload a sketch because communication was lost, etc, ALWAYS use an independent PSU and see if your problem goes away. It will save you a lot of time investigating "possible faulty Arduino's". Just don't fall for it.

Last edited by hicksd8; 12-20-2019 at 08:47 AM..
This User Gave Thanks to hicksd8 For This Post:
# 18  
Sound advice Dennis, Thanks!

I can plug my bench supply into it. Just lazy to put another piece of gear on my desk, that's all.

Sounds like your advice will save me a lot of time in the future.

Thank You!

Last edited by hicksd8; 12-20-2019 at 08:48 AM..
# 19  
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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