Using 16*2 display
16×2 LCD with I²C backpack (PCF8574) on Arduino/ESP boards.
✅ Hardware Connections
Since it uses I²C, only 4 wires are required:
LCD PinConnect to
VCC5V
GNDGND
SDAESP8266 → D2 (GPIO4) / ESP32 → GPIO21 / Arduino Uno → A4
SCLESP8266 → D1 (GP...
blog.aarav.com.np2 min read