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D1 WiFi Uno-Based Development Board – (ESP8266) NodeMCU Compatible

D1 WiFi Uno-Based Development Board – (ESP8266) NodeMCU Compatible

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SpecificationDetails
MicrocontrollerESP-8266EX (ESP-12F Module)
Operating Voltage3.3V
Input Voltage9V to 24V DC (via DC Jack)
Clock Speed80MHz / 160MHz
Flash Memory4MB
Digital I/O Pins11 (All support Interrupt/PWM/I2C/One-Wire)
Analog Input1 (Max 3.2V input)
Connectivity802.11 b/g/n WiFi
Price
₹ 271.19 ₹ 271.19
(Tax included)

Product Description

The D1 WiFi Board bridges the gap between traditional embedded systems and modern IoT. Unlike a standard UNO which operates at 5V, this board operates internally at 3.3V but includes an onboard switching power supply that allows it to handle a wide range of input voltages (up to 24V). It features a Micro-USB port for easy programming and a DC power jack for standalone operation. The board layout matches the UNO R3 footprint, allowing many existing Arduino shields to be plugged directly on top, though users must be mindful of the 3.3V logic level.

Key Features

  • Integrated WiFi: Built-in TCP/IP stack allows the board to connect to your home network or act as a standalone Access Point (AP).

  • Arduino IDE Compatible: Easily programmed using the Arduino environment by installing the ESP8266 board manager.

  • Large Memory & Speed: With 4MB of Flash and a 160MHz clock, it is significantly faster and more capable than an ATMega328P.

  • UNO Form Factor: Compatible with most non-voltage-sensitive Arduino shields, simplifying the transition from wired to wireless.

  • OTA (Over-The-Air) Updates: Supports wireless firmware updates, allowing you to reprogram the device without a USB cable once it is deployed.

Technical Details

  • USB-Serial Chip: CH340G.

  • Dimensions: 68.6mm x 53.4mm.

  • Logic Level: 3.3V (Not 5V tolerant on all pins).

Prototyping and Engineering Tips from Robogears

  • The 3.3V Warning: This is the most critical tip: the ESP8266 is a 3.3V device. While you can power the board with 9V via the DC jack, the I/O pins only tolerate 3.3V. Connecting a 5V sensor directly to the digital pins can damage the chip. Use a Bi-Directional Logic Level Converter for 5V components.

  • Analog Pin Limitation: Unlike the Arduino UNO which has 6 analog pins (0-5V), the D1 WiFi has only one analog pin (A0). Additionally, the raw ESP8266 ADC only handles 1.0V, but the D1 board includes an internal resistor divider allowing up to 3.2V on the A0 pin.

  • Shield Compatibility: Before plugging in an Arduino shield, check if it relies on 5V logic. Shields that use I2C or SPI will usually require level shifting to work reliably with the D1.

  • Powering for IoT: For stable WiFi performance, ensure your power source can provide at least 500mA. WiFi transmission causes brief current spikes that can cause the board to reset if powered by a weak USB port or a dying battery.

Package Includes

  • 1 x D1 WiFi UNO-Based Development Board (ESP8266)

Disclaimer

Ensure the correct board (usually "Lolin(Wemos) D1 R2 & mini") is selected in the Arduino IDE before uploading code. Always disconnect high-voltage sources before making wiring changes.

Product Description The D1 WiFi UNO Based Development Board is a powerful crossover module that combines the familiar form factor of the Arduino UNO with the high-speed wireless capabilities of the ESP8266 (NodeMCU). Unlike standard UNO boards, the D1 WiFi operates on a 3.3V logic level and features a built-in 802.11 b/g/n stack, making it an ideal choice for IoT (Internet of Things) projects. It is fully compatible with the Arduino IDE and can be programmed using the same C++ syntax, allowing users to easily transition their projects from offline automation to cloud-connected systems. Whether building a smart home gateway, a web-connected sensor node, or a mobile-controlled robot, this board provides the power and connectivity required for modern electronics.

Key Features

  • Arduino UNO Form Factor: Compatible with most Arduino UNO shields (note logic level differences), allowing for easy physical integration.

  • Integrated WiFi: Built-in ESP-8266EX chip provides robust 2.4GHz WiFi connectivity for web servers, OTA updates, and cloud data logging.

  • High Flash Capacity: Comes with 4MB of onboard flash memory, providing ample space for complex web interfaces and data storage.

  • USB-to-Serial Onboard: Features the reliable CH340G IC for easy programming and serial debugging via a standard Micro-USB cable.

  • Flexible Powering: Can be powered via the DC Jack (7-12V), the Micro-USB port (5V), or the Vin pin, offering versatility for portable and stationary use.


Technical Details

  • Core Processor: Powered by the Tensilica L106 32-bit RISC microprocessor, significantly faster than the standard ATMega328P.

  • Logic Level Warning: All I/O pins operate at 3.3V. Connecting 5V sensors directly to digital pins may damage the ESP8266 chip.

  • Analog Input Limitation: Features a single Analog-to-Digital Converter (ADC) pin (A0) with an internal voltage divider supporting up to 3.2V.

  • PWM Support: All 11 digital pins support software PWM, allowing for complex LED fading or motor speed control.

  • Interrupt Capability: All digital pins (except D0) support external interrupts for high-speed pulse counting and edge detection.

  • Deep Sleep Mode: Supports ultra-low power consumption modes, essential for battery-operated remote sensor nodes.

  • PCB Antenna: Integrated high-gain trace antenna ensures stable wireless signals without the need for external hardware.

  • Shield Compatibility: While the layout matches the UNO, users must verify that shields are 3.3V compatible or use level shifters.

  • Programming Flexibility: Supports Arduino IDE, MicroPython, Lua, and the native Espressif SDK for advanced developers.

  • I2C and SPI: Hardware-supported I2C and SPI buses for connecting OLED displays, SD card modules, and advanced sensors.

  • Clock Speed Control: Users can toggle between 80MHz for power saving and 160MHz for high-computational tasks.

  • Flash Speed: Supports high-speed SPI Flash communication for rapid program execution and file system (LittleFS) access.

  • Stable Regulation: Features high-quality 3.3V LDO regulators to handle the current spikes required during WiFi transmission.

  • Reset Logic: Dedicated hardware reset button and auto-reset circuitry for seamless "one-click" uploading from a PC.

  • Serial Communication: Hardware UART (TX/RX) mapped to pins D0/D1 for interfacing with GPS, GSM, or other serial modules.


Prototyping and Engineering Tips from Robogears

  • 9V Battery Use: You can power the D1 WiFi via the DC Jack using a 9V battery. However, WiFi transmission draws significant current (~200mA+); a standard 9V battery will drain very quickly. For long-term use, use an External 9V 2A Power Adapter.

  • 18650 Cell: A single 18650 cell (3.7V) can be connected to the 3.3V pin if it is a regulated 3.3V source, or use two 18650s in series (7.4V) into the DC Jack or Vin pin for maximum stability.

  • IC & Capacitor Tip: For stable WiFi performance, place a 100uF Electrolytic Capacitor across the 3.3V and GND pins to prevent "brown-out" resets during high-power wireless bursts. If using 5V sensors, use a 4-channel Logic Level Converter (IC 4050 or BSS138 based).

  • Related Products: We recommend pairing this with our DHT11/DHT22 Temperature Sensors, I2C OLED Displays, and 4-Channel Logic Level Converters.

Package Includes

  • 1 x D1 WiFi UNO Based Development Board (ESP8266).

Disclaimer Image is for ilastration purpose only 2-3 lines. Please note that this board operates at 3.3V logic. Connecting 5V signals to the digital or analog pins without proper level shifting will result in permanent damage to the ESP8266 IC. Always verify shield voltage compatibility before mounting.