ESP32-WROOM-32 Pinout Reference

ESP32-WROOM-32 DevKitC V4 (38-Pin)

ESP-WROOM-32 Espressif Systems

BOOT

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Click any pin on the interactive board diagram to view its specific functions, safety status, and configuration details based on the LastMinuteEngineers reference.

Common Connections Guide

I2C OLED Display (e.g., SSD1306)

Uses the default I2C pins. These displays are typically 3.3V logic compatible.

OLED Pin	ESP32 Pin	Notes
VCC	3V3	Power from regulator
GND	GND	Common ground
SCL	GPIO 22	Default I2C Clock
SDA	GPIO 21	Default I2C Data

16x2 / 20x4 LCD (with I2C Backpack)

Most character LCDs require 5V to power the backlight and logic. The ESP32's 3.3V logic signals on SDA/SCL are usually sufficient to drive the 5V I2C backpack without level shifters.

LCD Pin	ESP32 Pin	Notes
VCC	5V (VIN)	Must power ESP via USB to get 5V here. 3.3V may make screen unreadable.
GND	GND	Common ground
SCL	GPIO 22	Default I2C Clock
SDA	GPIO 21	Default I2C Data