How to use LCD on Arduino?
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You use an LCD on Arduino by doing two things : Wire it correctly Use the LiquidCrystal (or I2C) library in your sketch I’ll show you both the classic 16×2 LCD with parallel pins and the I2C backpack version. 1. The LCD we’re talking about Most tutorials (and this answer) assume a 16×2 character LCD that’s “HD44780-compatible”, like this: 16 characters × 2 lines Pins: VSS, VDD, VO, RS, RW, E, D0–D7, A, K If yours has only 4 pins (GND, VCC, SDA, SCL) → that’s an I2C backpack version. I’ll cover that in section 4. 2. Wiring a 16×2 LCD directly to Arduino (4-bit mode) We’ll use 4 data lines (D4–D7) to save pins. Parts: Arduino Uno (any board is fine) 16×2 LCD 10 kΩ potentiometer (for contrast) Some jumper wires Optional: 220 Ω resistor for LCD backlight Typical wiring table (4-bit mode) Assume these connections: LCD Pin Name Connect To 1 VSS GND 2 VDD +5V 3 VO Middle pin of 10k pot (contrast) Pot side 1 → GND, side 2 → +5V 4 RS A...