Hello world example on an LCD display

[charmedone07]

Thanks for that link. I did not try this with the breadboard first. The LCD was already soldered with the l2c, because quite frankly all the attempts I've tried at soldering have gone terrible. I use just about any power tool but haven't got the hang of that thing yet. I was trying to avoid it. But I'm starting to wonder if that is where the issue lies.

[xfpd]

Try again with your shortest jumper wires on A5/A4 (power and ground can be any reasonable length). IIC (inter-integrated-circuit) is made for short runs on a circuit board. and post a picture of the (each?) LCD showing the results

[underhilll]

He's got a backpack on it, the jumper to the ardu won't matter, I have run 6 feet of 20AWG on those.

Please show the code that you are using. This should be VERY simple,

#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 20, 4); // 20 is columns and 4 is rows
.
.
. //in setup;
  lcd.init();
  lcd.clear();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("you are winner");

Your solder job looks good so no issues there. Need to see your project code.

Also regarding wires, for an I2C LCD they CANNOT be loose AT ALL

[xfpd]

...

@underhilll

This should be VERY simple

[kolaha]

@charmedone07

Below is the code I'm using that uploads and shows in the serial monitor:

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2);
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);



}

void loop() {
  // put your main code here, to run repeatedly:
  Serial.println("Hello, World!");

}

don't say you meant this sketch while name this topic

[charmedone07]

So I took the various advice I was given and played around with different wiring and a sketch from another library I had installed and for some reason it worked. I changed the sketch a little because I didn't like the backlight flashing that was written into it and I have success. But now I want to know why this one worked so I can learn what I did wrong. What does everyone think?

```cpp
/*
    LCD_I2C - Arduino library to control a 16x2 LCD via an I2C adapter based on PCF8574

    Copyright(C) 2020 Blackhack <davidaristi.0504@gmail.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 <LCD_I2C.h>

LCD_I2C lcd(0x27); // Default address of most PCF8574 modules, change according

void setup()
{
    lcd.begin(); // If you are using more I2C devices using the Wire library use lcd.begin(false)
                 // this stop the library(LCD_I2C) from calling Wire.begin()
    lcd.backlight();
}

void loop()
{
    lcd.print("Ghostbusters"); // Display text
    lcd.setCursor(0, 1); // Or setting the cursor in the desired position.
    lcd.print("WhoYouGonnaCall?");
    delay(500);

   
}

[xfpd]

@charmedone07

What does everyone think?

---

@xfpd

jumper wires