ESP32 Pinout Explorer - Interactive Free Web App

ESP32 DevKit V1 Interactive Pinout · Click any pin for details

←

Click any pin on the board
to see its full details here

Alternative Functions

📘 ESP32 DevKit V1 Pinout Explorer - User Guide

This interactive tool helps you navigate the ESP32 DevKit V1 board - one of the most popular development boards for IoT and embedded projects. Click any pin to see its complete specifications, alternate functions, and important programming notes. Perfect for beginners diving into ESP32 or experienced developers needing quick reference.

🔍 How to Use This Tool

1 Click Any Pin

Simply click on any pin on the ESP32 board diagram. The right panel instantly displays all details about that pin including functions, voltage, and programming notes.

2 Filter Pins

Use the filter buttons (GPIO, ADC, I2C, SPI, etc.) to highlight specific pin types on the board. Active filters glow with their respective colors.

3 Browse Pin List

Click "SHOW" to expand the complete pin list. Click any pin in the list to select and highlight it on the board diagram.

4 Hover for Quick Info

Hover your mouse over any pin to see a tooltip with the pin name, main functions, and voltage - perfect for quick reference.

📋 What Each Pin Shows

Information	Description
Pin ID	The pin label as printed on the board (e.g., D23, 3V3, EN)
Full Name	Complete technical name (e.g., "GPIO23" or "3.3V Output")
Functions	What the pin can do (GPIO, ADC, DAC, I2C, SPI, UART, PWM, etc.)
Voltage	Operating voltage (3.3V for most pins, VIN accepts 5-12V)
Max Current	Maximum current the pin can source/sink (typically 40mA)
Alternative Functions	Special uses like touch sensors, RTC, DAC, or programming functions

🎨 Pin Color Codes

Power (VIN, 3V3)

Ground (GND)

GPIO (General Purpose)

ADC (Analog Input)

DAC (Analog Output)

SPI

I2C

UART (Serial)

PWM

Touch Sensor

RTC (Real Time Clock)

Special (EN, Boot)

🔧 ESP32 Specifications

Microcontroller: Xtensa dual-core 32-bit LX6
Operating Voltage: 3.3V (⚠️ NOT 5V tolerant!)
Digital I/O Pins: 34 (many functions multiplexed)
ADC Pins: 18 (12-bit resolution)
DAC Pins: 2 (8-bit) on GPIO25, GPIO26
Touch Sensors: 10 capacitive touch pins
WiFi: 802.11 b/g/n (2.4 GHz)
Bluetooth: v4.2 BR/EDR and BLE
Clock Speed: Up to 240 MHz
Flash Memory: 4 MB (typical)
SRAM: 520 KB

💡 Critical ESP32 Tips

⚠️ VOLTAGE WARNING:

All pins are 3.3V only! Applying 5V will permanently damage your ESP32.

ADC2 pins cannot be used when WiFi is active - use ADC1 instead
GPIO34-39 are input-only - no pull-ups, no output
GPIO0 low + reset enters flash/programming mode
GPIO12 affects flash voltage (strapping pin)
GPIO2 must be high for flash mode
GPIO15 must be low for flash mode
EN pin = reset (pull low to reset)
Maximum total current from 3.3V pin: ~800mA
I/O pins max current: 40mA (recommended 20mA)

📝 Programming Functions

GPIO: pinMode(), digitalWrite(), digitalRead()

ADC: analogRead() (12-bit, 0-4095)

DAC: dacWrite() (8-bit, 0-255)

PWM: ledcSetup(), ledcWrite()

I2C: Wire.begin(SDA, SCL)

SPI: SPI.begin(SCK, MISO, MOSI, SS)

UART: Serial1, Serial2 (additional hardware serial)

Touch: touchRead()

🧠 About This Tool

The ESP32 DevKit V1 Pinout Explorer is an interactive reference tool designed for IoT developers, makers, and students. Unlike static pinout diagrams, this tool lets you explore the board dynamically - click, hover, and filter to understand the complex multiplexing of ESP32 pins. Whether you're wiring sensors, designing PCBs, or learning ESP32 programming, this tool helps prevent common mistakes like using 5V on 3.3V pins or selecting ADC2 pins when WiFi is active.

Version 1.0 • Compatible with ESP32 DevKit V1 and similar ESP32 development boards • Free for educational and commercial use • Updated March 2026

⬅️ Click any pin on the board above to start exploring! ➡️