ESP32-WROOM Development Board
Versatile Power Options for IoT and Embedded Projects
This ESP32-WROOM development board features both a 3.3V input/output pin and a VIN power input pin, offering flexible powering options for different project needs.
Dual Power Input Options Supports both 3.3V regulated and 512V via VIN
Onboard Voltage Regulator - Converts VIN to stable 3.3V for the ESP32 module
VIN pin accepts 5V to 12V DC input (check board specs for exact range) [citation:3][citation:4][citation:9]
The 3.3V pin is primarily a regulated output, but can also accept regulated 3.3V input on some boards [citation:1][citation:5]
For batterypowered projects, use VIN with 512V input and let the onboard regulator do the work [citation:1]
Do not apply voltage above 3.6V directly to the 3.3V pin unless the board specifically supports it
Power Pin Specifications
| Pin | Function | Voltage | Use Case |
|---|
| VIN | Power Input | 5-12V DC | Feeds onboard regulator, recommended for external power |
| 3V3 | Regulated Output / Input | 3.3V | Powers peripherals OR regulated input (check board) |
| GND | Ground | - | Common reference for all circuits |
The onboard AMS1117 voltage regulator converts the higher VIN voltage to the 3.3V required by the ESP32 module [citation:8][citation:12]. This allows you to use common power sources like USB power banks, 9V batteries, or 12V adapters without additional voltage conversion circuitry [citation:1][citation:4].
Key Features
Onboard Voltage Regulator Accepts 512V on VIN for flexible power sourcing
USB Power Option - Can be powered via USB port as well
Regulated 3.3V Output - 3.3V pin can power external sensors and modules
= Applications =
- Battery-powered IoT sensors
- Portable data loggers
- Smart home devices
- Robotics and automation projects
Flexible Powering Choose between USB, 512V VIN, or regulated 3.3V input
Regulator Protection - Onboard LDO protects the ESP32 from voltage spikes
√ Compatible with Arduino IDE and ESP-IDF
√ Works with common power adapters and battery packs
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