Very Basic Arduino Uno Board Testing


 
Thread Tools Search this Thread
Top Forums Programming Very Basic Arduino Uno Board Testing
# 15  
Old 12-20-2019
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  
Old 12-20-2019
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 07:06 AM..
This User Gave Thanks to Neo For This Post:
# 17  
Old 12-20-2019
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 07:47 AM..
This User Gave Thanks to hicksd8 For This Post:
# 18  
Old 12-20-2019
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 07:48 AM..
# 19  
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);
}

Login or Register to Ask a Question

Previous Thread | Next Thread

8 More Discussions You Might Find Interesting

1. Programming

Basic Arduino UNO Bluetooth Testing with the BLE 4.0 (CC2541, MLT-BT04 IC)

Here is a sketch to do basic testing for the Arduino UNO and the MLT-BT04. This BLE module works with IOS (iPhone) and I'll add some details on my IOS testing with an iPhone in a follow-up post. For now, here is the basic BLE (HM-10) sketch for the Arduino UNO: /* Arduino test-code... (7 Replies)
Discussion started by: Neo
7 Replies

2. Programming

Arduino UNIX Time - Syncing Computer UNIX Time to Arduino Time with Python

Just finished a quick Python script to send the current unix time over to the Arduino from macOS, so in the absence of GPS or some other way to get the unix timestamp (epoch time) to the Arduino, I can get my macOS and Arduino UNO synced to within a second. Normally, when the Arduino starts... (9 Replies)
Discussion started by: Neo
9 Replies

3. Programming

Chinese Arduino UNO Clones - The Wavgat versus the generic UNO R3 Clone - The Winner Is?

Waiting for more fun Ardunio parts from AliExpress, I decided to test two cheap Chinese Arduino UNO clones. The Arduino UNO R3 (CH340G) MEGA328P The Wavgat UNO R3 (CH340G) MEGA328P Both of these Chinese Ardunio clones sell for about $3 USD, delivered to your door. The bottom line is... (0 Replies)
Discussion started by: Neo
0 Replies

4. Programming

More Arduino Stuff...

HI all... (Apologies for any typos.) To add to Neo's Arduino subject matter I have decided to upload this in ".zip" format. Ignore "*.info" files these are AMIGA icons only and also the "HAM" drawer as these are photos in ancient AMIGA HAM modes. I have noticed that there are current... (6 Replies)
Discussion started by: wisecracker
6 Replies

5. Programming

Arduino-cli - Uploading to Unknown Chinese Arduino Boards using the Arduino Command Line Interface

In my further exploration of Arduino, today I decided to install the arduino-cli on my mac today. https://github.com/arduino/arduino-cli I followed the instructions for macOS but when I got to this part: arduino-cli board list I got the dreaded "Unknown" Fully Qualified Board Name... (1 Reply)
Discussion started by: Neo
1 Replies

6. OS X (Apple)

Semi-Automatic Arduino Detection.

I am working on a semi-auto detection idea for Arduino for the Scope project. It does require a little user intervention but minimal. It works by just responding to two on screen prompts to unplug and plug Arduino into a USB port. There are two versions and both work perfectly well and give... (3 Replies)
Discussion started by: wisecracker
3 Replies

7. OS X (Apple)

Arduino Diecimila Board Access...

This is a very simple starter DEMO to access Arduino Diecimila Board for the Macbook Pro 13" OSX 10.7.5... A potentiometer is connected between 5V and Gnd with the wiper connected to ANALOG IN 0 on the Arduino. This was adjusted to give the Ms and Ls as seen... I now have DC in for this... (0 Replies)
Discussion started by: wisecracker
0 Replies

8. Shell Programming and Scripting

Use The Terminal To Test Arduino Is Working.

Hi all... (Apologies for any typos at all.) This is a step by step _script_ to check if your Arduino is talking to your Linux or Macbook Pro computer using the Terminal... It works on at least 3 Linux flavours and now the Macbook Pro... I hope you find it useful as a simple check for... (0 Replies)
Discussion started by: wisecracker
0 Replies
Login or Register to Ask a Question