how to use test 16x2 LCD i2c Display white screen and i2c address problem solution
how to use test 16x2 LCD i2c Display white screen and i2c address problem solution
- Proper Soldering
- SCL and SDA proper Connection
- Correct I2C Address
Full Video- https://youtu.be/vsidQduHQE8?si=mjqEpsGv2u4PnYEE
I2C address Scan code link- https://github.com/futuristiciox/P345._I2C_Address_Scanner_All_Connected_2026_sketch_jan29a
Connection-
I2C address Scan code-
#include <Wire.h>
void setup() {
Wire.begin();
Serial.begin(115200);
while (!Serial); // Wait for Serial Monitor
Serial.println("\nI2C Scanner");
}
void loop() {
byte error, address;
int nDevices = 0;
Serial.println("Scanning...");
for (address = 1; address < 127; address++) {
Wire.beginTransmission(address);
error = Wire.endTransmission();
if (error == 0) {
Serial.print("I2C device found at address 0x");
if (address < 16) Serial.print("0");
Serial.println(address, HEX);
nDevices++;
} else if (error == 4) {
Serial.print("Unknown error at address 0x");
if (address < 16) Serial.print("0");
Serial.println(address, HEX);
}
}
if (nDevices == 0)
Serial.println("No I2C devices found\n");
else
Serial.println("done\n");
delay(5000); // Wait 5 seconds before scanning again
}
Example code-
//YWROBOT
//Compatible with the Arduino IDE 1.0
//Library version:1.1
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,20,4); // set the LCD address to 0x27 for a 16 chars and 2 line display
void setup()
{
lcd.init(); // initialize the lcd
lcd.init();
// Print a message to the LCD.
lcd.backlight();
lcd.setCursor(3,0);
lcd.print("Hello, world!");
lcd.setCursor(2,1);
lcd.print("Ywrobot Arduino!");
lcd.setCursor(0,2);
lcd.print("Arduino LCM IIC 2004");
lcd.setCursor(2,3);
lcd.print("Power By Ec-yuan!");
}
void loop()
{
}
Very useful guide for troubleshooting a 16x2 I2C LCD, especially the reminder to check the soldering, SDA/SCL connections, and the correct I2C address before assuming the display itself is faulty. The scanner code is particularly helpful when you don’t know the module’s address. Since a white display can mean very different things depending on the device, this simple white screen tool can also be useful when you need a clean full-screen reference for checking other displays or comparing brightness.
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