ESP32 WROOM 38 Pin WiFi Bluetooth Development Board

The ESP32 WROOM 38 Pin WiFi Bluetooth Development Board is a versatile IoT development board built around the ESP32 WROOM 32-bit dual-core processor running at 80MHz to 240MHz, with integrated WiFi 2.4GHz and Bluetooth on a single chip. The esp32 38 pin board carries 4MB flash, 512KB SRAM, and exposes all 38 GPIO pins through its dual-row header layout, accepting 5V via USB input and regulating down to 2.3V to 3.3V for internal ESP32 logic operation. The UART interface handles both programming and serial debug communication from the Arduino IDE, MicroPython, or ESP-IDF.

The esp32 wroom 38 pin variant exposes four additional analog input-only pins — GPIO34, GPIO35, GPIO36, and GPIO39 — that are not available on the 30-pin ESP32 board layout. These pins support multi-channel ADC sensor builds including current sensors, microphone modules, and potentiometer arrays without needing an external ADC IC. The esp32 wifi bluetooth board runs both protocols concurrently — the dual-core design assigns the radio stack to one core and the user application to the other, preventing WiFi transmission from stalling sensor reads or control output timing. One practical trade-off: all GPIO pins are 3.3V logic — 5V sensor outputs must go through a level shifter before connecting to any IO pin to avoid GPIO damage.

The non-obvious advantage of the ESP32 over the ESP8266 in Indian college IoT labs is the hardware crypto accelerator built into the chip — operations execute in hardware, making HTTPS and TLS connections to cloud platforms significantly faster than on ESP8266 firmware-based SSL. The esp32 development board suits wifi sensor dashboards, BLE beacons, and OTA update systems. Available from StemVolt, this unit is suitable for engineers working on WiFi Bluetooth IoT applications and practical embedded electronics projects.

Related Product:

• Explore the IOT and Wireless Module for robotics projects

Features:

• 38 GPIO pins expose ADC input-only channels not on 30-pin boards
• Dual-core ESP32 WROOM handles WiFi BT stack and user app separately
• 4MB flash supports firmware OTA partition and file system storage simultaneously
• WiFi and Bluetooth both active for multi-protocol IoT sensor builds
• UART interface programs via Arduino IDE MicroPython or ESP-IDF toolchain

Technical Specifications:

 Applications:

• ESP32 38 Pin Board used for WiFi MQTT cloud sensor dashboard
• College project uses esp32 development board for BLE proximity detection build
• Home automation uses esp32 wifi bluetooth board for relay and voice control
• Multi-sensor logger uses esp32 38 pin board for all ADC channel builds
• OTA update system uses esp32 wroom 38 pin for wireless firmware deploy

Package Includes:

• 1 × ESP32 WROOM 38 Pin WiFi Bluetooth Development Board