20×4 Character LCD – Blue Backlight (Soldered Header)

🔹 20×4 Character LCD – Blue Backlight (Soldered Header)

A classic 20×4 LCD module with white-on-blue backlight, powered by the robust HD44780/ST7066 controller. Easily integrates with Arduino, Raspberry Pi, and microcontrollers, perfect for advanced DIY projects, robotics dashboards, and data displays.

🛠 Wiring & Setup with Arduino (Parallel)

cpp
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#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 10, 5, 4, 3);
// RS, E, D4, D5, D6, D7

void setup(){
  lcd.begin(20, 4);
  lcd.print("Hello, 20x4 LCD!");
}
void loop(){}

• Wire RS → D12, E → D11, D4–D7 → D5–D2

• Use 5 V, GND, contrast pot to V0, LED+ with 220 Ω to 5 V addicore.com+15keyestudio.com+15forum.arduino.cc+15

🔌 I²C Integration (6-Wire Setup)

Install via Arduino Library Manager:

Sketch → Include Library → Manage Libraries… → search “LiquidCrystal I2C” → Install

Arduino Wiring: VCC → 5 V; GND → GND; SDA → A4; SCL → A5

cpp
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#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 20, 4);
void setup(){
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("I2C 20x4 LCD");
}
void loop(){}

🎥 YouTube Tutorials

• Parallel Setup: https://www.youtube.com/watch?v=MEEUkiq9kVg

• I²C Setup: https://www.youtube.com/watch?v=3LOSV7_wAmg

• Full 20×4 Demo: https://www.youtube.com/watch?v=F9IVtKa8C7Q

• Serial/backpack tutorial: https://www.youtube.com/watch?v=DKmNSCMPDjE

📄 Datasheet & Links

• Official Datasheet PDF (Joy-IT/QY models): 20×4 LCD module – 98×60×14 mm keyestudio.comyoutube.com+1youtube.com+1youtube.comyoutube.comyoutube.comjoy-it.net

• Technical Data (Futurlec): Includes voltage/current specs, pinouts futurlec.com

• HD44780 Controller Info: Background and command set m.youtube.com+15en.wikipedia.org+15mouser.com+15