lcd 20*4 ChatGPT said: The LCD 20×4 is an alphanumeric display module similar to the LCD 16×2, but it can display 20 characters per line and has 4 lines. This gives it a total capacity of 80 characters (20 × 4). Each character is displayed in a 5×8 pixel matrix, making it suitable for projects that need to show more data at once. 🔹 Details and Explanation Display Type: Alphanumeric LCD Characters: 20 per line × 4 lines = 80 characters total Controller IC: Typically based on HD44780 or compatible driver Operating Voltage: 4.7V – 5.3V (standard 5V) Logic Level: 5V (works with 3.3V MCUs using level shifters or I2C module) Backlight: Available in green/yellow or blue with white/black characters Interface Options: Parallel communication (4-bit or 8-bit data mode + control pins) I2C interface module (reduces wiring, only requires SDA & SCL pins) 🔹 Pin Configuration (16 pins, same as LCD 16×2) VSS: Ground VCC: +5V supply VEE: Contrast adjustment (via potentiometer) RS (Register Select): Command/Data select RW (Read/Write): Selects read or write mode EN (Enable): Enables data transfer 7–14. D0–D7: Data pins (4-bit or 8-bit mode) LED+ (A): Backlight + LED- (K): Backlight – 🔹 Working Principle The microcontroller sends commands (cursor position, clear display, shift display, etc.) and data (characters to display) to the LCD. The RS pin selects whether the input is data or command. The Enable pin activates data latching. The LCD’s controller arranges the character pixels on the screen. Since it has 4 lines, data is written line by line. 🔹 Applications Industrial display panels IoT and embedded projects (e.g., weather stations, monitoring systems) Digital meters (voltage, current, temperature) Robotics and automation displays Menu systems in devices 👉 Example: With an Arduino, you can display multiple sensor values at once: Line 1: "Temp: 25.4°C" Line 2: "Humidity: 60%" Line 3: "Voltage: 12.1V" Line 4: "Status: NORMAL"