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Overview:
 
The D1 R32 ESP32 Board blends the power of the ESP-WROOM-32 dual-core Wi-Fi + Bluetooth microcontroller with the familiar Arduino UNO R3 form factor, providing a perfect bridge between classic Arduino hardware and modern IoT performance.
 
It features both 5 V and 3.3 V rails for compatibility with UNO-style shields — the ESP32 itself runs on 3.3 V logic, while the 5 V line is supplied from USB or VIN to power shields and sensors that need it.
 
With built-in Wi-Fi, Bluetooth, 6 analog inputs, UNO pinout, and Micro-USB programming, this board is a ready-to-go upgrade path for wireless prototyping, automation, and educational projects.

    Third-Party Arduino UNO WiFi (WROOM-32 Chip)

    $5.40Price
    Quantity

    • Key Features:

      • ESP-WROOM-32 module with dual-core Xtensa LX6 CPU (240 MHz max) and integrated Wi-Fi 802.11 b/g/n + Bluetooth v4.2 (BR/EDR + BLE).
       

      • Arduino UNO-compatible footprint — reuse most UNO R3 shields, headers, and mounting holes.
       

      • On-board CH340 USB-to-UART interface for easy programming via Arduino IDE, PlatformIO, or ESP-IDF.
       

      • Micro-USB port for both power and data (no external adapter required).
       

      • 6 analog inputs (A0–A5) mapped to ESP32 ADC1 pins (GPIO 36, 39, 34, 35, 32, 33) — all usable even with Wi-Fi active.
       

      • 5 V and 3.3 V power rails for shield compatibility — 5 V from USB/VIN, 3.3 V for ESP32 core and logic.
       

      • 30+ GPIO pins supporting PWM, ADC, DAC, UART, I²C, SPI, and capacitive touch functions.
       

      • Reset and Boot buttons for firmware upload and recovery.
       

      • Power LED and user status LED for quick visual feedback.
       

      • Fully compatible with Arduino IDE, ESP-IDF, MicroPython, and PlatformIO.
       

       

       

      Specifications:

      • Microcontroller: Espressif ESP-WROOM-32 (Dual-core Xtensa LX6 @ 240 MHz)
       

      • Flash Memory: 4 MB (QSPI Flash)
       

      • SRAM: 520 KB (on-chip)
       

      • Connectivity: Wi-Fi 802.11 b/g/n (2.4 GHz) + Bluetooth v4.2 (BR/EDR + BLE)
       

      • Logic Voltage: 3.3 V
       

      • Power Rails: 3.3 V and 5 V (5 V supplied from USB or VIN regulator)
       

      • Input Voltage (VIN): 7–12 V via DC jack or VIN header (5 V USB compatible)
       

      • Current Draw: ≈ 80–250 mA active / < 1 mA deep sleep
       

      • Analog Inputs: 6 × 12-bit ADC (0–3.3 V range, A0–A5)
       

      • DAC Outputs: 2 × 8-bit (GPIO 25, 26)
       

      • PWM Channels: Up to 16 hardware PWM outputs
       

      • USB Interface: Micro-USB Type-B (via CH340 bridge)
       

      • Voltage Regulators: AMS1117-5.0 and AMS1117-3.3 LDO regulators
       

      • Board Dimensions: ≈ 68 × 53 mm (UNO footprint)
       

      • Operating Temperature: −40 °C to +85 °C
       

       

       

       

      Power Architecture Explained:

      The ESP32 core operates strictly at 3.3 V logic, but the D1 R32 board includes a 5 V rail for Arduino UNO shield compatibility.
       

      • When powered from USB, the 5 V from the port is passed to the 5 V header and then regulated down to 3.3 V for the ESP32.
       

      • When powered from VIN or the DC jack, the input voltage (7–12 V) is first regulated to 5 V, then down to 3.3 V.
      ␣

      • The 5 V pin is safe for supplying external sensors or UNO shields that internally regulate their logic, but do not feed 5 V signals directly into ESP32 GPIOs — these remain 3.3 V only.
       

      This dual-rail setup preserves UNO-style power pin compatibility while keeping the ESP32 core safe.
       

       

       

       

      Applications:

      • IoT and home automation projects with Wi-Fi or Bluetooth control.
       

      • Educational use — teach wireless and embedded coding on a familiar UNO-style layout.
       

      • Data loggers and sensor nodes with Wi-Fi upload capability.
       

      • Robotics and automation using wireless connectivity or web dashboards.
       

      • Upgrading existing UNO projects to ESP32 performance without rewiring.

       

      DATASHEET:  ESP-WROOM-32 
      Reminder: This board is BASED off the ESP-WROOM-32, some minor differences MAY be present.

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