user40826: The code dont gives error, but not displays "Hello World"
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

// Set the LCD address to 0x27 for a 16 chars and 2 line display
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  // initialize the LCD
  lcd.begin();
  // Turn on the blacklight and print a message.
  lcd.backlight();
  lcd.print("Hello, world!");
}

void loop() {
}


user31105: This can be due a lot of reasons, among:
Most common:

Backlight is set too low (there should be a small dial)
Circuit problem (recheck), and post it.
The I2C address is wrong, there are sketches to check it.

Less common:

Broken LCD
Broken Arduino
No power on Arduino (check LED)


40826: <p>The code dont gives error, but not displays "Hello World"</p>

<pre><code>#include &lt;Wire.h&gt; 
#include &lt;LiquidCrystal_I2C.h&gt;

// Set the LCD address to 0x27 for a 16 chars and 2 line display
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  // initialize the LCD
  lcd.begin();
  // Turn on the blacklight and print a message.
  lcd.backlight();
  lcd.print("Hello, world!");
}

void loop() {
}
</code></pre>
 31105: <p>This can be due a lot of reasons, among:</p>

<p>Most common:</p>

<ul>
<li>Backlight is set too low (there should be a small dial)</li>
<li>Circuit problem (recheck), and post it.</li>
<li>The I2C address is wrong, there are sketches to check it.</li>
</ul>

<p>Less common:</p>

<ul>
<li>Broken LCD</li>
<li>Broken Arduino</li>
<li>No power on Arduino (check LED)</li>
</ul>
