| Quantity | Price |
| 1+ | $14.92 |
| 10+ | $14.77 |
| 1000+ | $14.62 |
Description
Application features:Main Chip: ESP-12F (ESP8266)
Interface: Onboard Micro USB (power supply & serial communication)
Programming Methods: Arduino IDE / MicroPython / ESP8266 SDK
Application Scenarios: Smart home, IoT nodes, WiFi switches, sensor data upload
Advantages: Compact size, integrated USB, no external downloader required
Why Choose QIXINWEI
Years of experience in the electronics industry. Trusted by global customers.
Massive In-Stock Inventory – Ready to ship promptly
BOM Matching Service – One-stop solution, save time
PCBA Customization – Professional engineering team creates tailor-made solutions based on your needs
Cost-Effective & Efficient – Better channel, better cost
A dedicated team makes your procurement smoother.
Contact us for BOM quotes or PCBA inquiries
Quantity(Pieces) | 1 ~ 30000 | 30001 ~ 300000 | > 300000 |
Est. Time(days) | 5 | 7 | To be negotiated |
FAQ:
What is the HW‑350B D1 Mini ESP8266 board and its key specifications?
This board is a compact Wi‑Fi development board based on the ESP‑12F module, which integrates the ESP8266 chip. It features a 32‑bit Tensilica L106 processor running at 80 MHz or 160 MHz, 4 MB of QSPI Flash memory, and 802.11 b/g/n Wi‑Fi (2.4 GHz). The board provides 11 digital I/O pins (all support PWM except D0), a single 10‑bit ADC (0–3.3 V), and standard interfaces including UART, SPI, I2C. It is powered via a micro‑USB port (5 V), has an on‑board 3.3 V regulator, and uses a CH340G USB‑to‑serial converter. The HW‑350B is fully compatible with the Arduino IDE, MicroPython, and ESP‑Easy, making it ideal for IoT, smart home, and WiFi‑connected projects.
How does the HW‑350B D1 Mini differ from a NodeMCU or Arduino Uno?
Compared to the NodeMCU, the D1 Mini is significantly smaller (about 34 mm × 25 mm), has fewer GPIO pins (11 vs. 17), but is otherwise functionally identical — both use the same ESP8266 chip and offer the same Wi‑Fi capabilities. The Arduino Uno is a 5 V, 8‑bit ATmega328P board with no built‑in wireless. The D1 Mini operates at 3.3 V logic and includes Wi‑Fi, a much faster processor, and far more Flash memory (4 MB vs. 32 KB). The D1 Mini is perfect for space‑constrained wireless projects, while the NodeMCU is better when you need more I/O, and the Uno is suitable for simple, low‑power 5 V sensor interfaces.
How do I set up the HW‑350B D1 Mini in the Arduino IDE?
First, install the CH340G driver (see next question). In the Arduino IDE, go to File → Preferences and add the following URL to “Additional Boards Manager URLs”: https://arduino.esp8266.com/stable/package_esp8266com_index.json. Then go to Tools → Board → Boards Manager, search for “esp8266”, and install the ESP8266 by ESP8266 Community package. After installation, select “LOLIN(WEMOS) D1 mini (clone)” or “WeMos D1 R2 & mini” as the board. Choose the correct COM port, set the upload speed to 115200, and you are ready to program. The built‑in ESP8266WiFi library is used for wireless connectivity.
How do I install the CH340G driver on Windows, macOS, or Linux?
The CH340G is a widely used USB‑to‑serial chip. Windows: Download the CH341SER driver, unzip, run the installer, and reboot. The board will appear as a COM port in Device Manager. macOS: Download the CH34x driver, install it, and allow the kernel extension in Security & Privacy. Linux: Most distributions include the driver out of the box; if not, install it via your package manager (e.g., sudo apt install ch340). Once the driver is installed, the board is recognized immediately.
What is the pinout of the HW‑350B D1 Mini, and which pins should I be careful with?
The board follows the D1 Mini pinout standard with 11 digital I/O pins (D0–D8, plus RX/TX), and one analog input (A0, 0–3.3 V). All pins operate at 3.3 V logic and are not 5 V tolerant. Important notes: GPIO0 (D3) and GPIO2 (D4) must be pulled HIGH at boot, or the board will enter flash mode. GPIO15 (D8) must be pulled LOW at boot. The TX and RX pins are used for serial programming; do not connect external sensors to them while uploading firmware. The board also provides 5 V and 3.3 V output pins to power external components.
How do I power the HW‑350B D1 Mini, and what is the power consumption?
The easiest way is via the micro‑USB port (5 V), which powers the on‑board 3.3 V regulator. You can also supply 5 V directly to the 5V pin or a regulated 3.3 V to the 3.3 V pin (do not use both USB and external power simultaneously). In active Wi‑Fi mode, the board draws about 70 mA – 80 mA. It supports deep‑sleep mode, where consumption drops to ~20 µA, making it suitable for battery‑powered projects. A single 3.7 V Li‑Po cell connected to the 5V pin (via a boost regulator or directly to the 3.3 V pin with caution) can power the board.
What is the Wi‑Fi range and data rate of the HW‑350B D1 Mini?
The ESP8266 supports 802.11 b/g/n in the 2.4 GHz band. Under typical indoor conditions, the Wi‑Fi range is approximately 30 m – 50 m (line‑of‑sight). The maximum PHY data rate is 72.2 Mbps (802.11n, 20 MHz channel). In practice, TCP throughput is around 10 Mbps – 15 Mbps with a strong signal. The on‑board PCB antenna provides adequate performance; for extended range, an external antenna can be soldered to the ESP‑12F module (if your board exposes the antenna pad).
How does the HW‑350B compare to other ESP8266 boards like the Wemos D1 Mini or ESP‑01?
The HW‑350B is essentially a clone of the Wemos D1 Mini, sharing the same form factor, pinout, and USB‑to‑serial chip. It is fully compatible with all D1 Mini shields and libraries. Compared to the ESP‑01, the HW‑350B is much easier to use — it includes a USB port, voltage regulator, and more accessible GPIO pins, eliminating the need for an external USB‑to‑serial adapter and breadboard wiring. The ESP‑01 only exposes 4 GPIO pins and is more suited for simple, embedded Wi‑Fi modules. For most prototyping, the HW‑350B D1 Mini is the more convenient choice.
What are the most common problems when using the HW‑350B D1 Mini, and how can I troubleshoot them?
1) Board not recognized by PC: install the CH340G driver; use a data‑capable micro‑USB cable. 2) Upload fails (espcomm error): ensure the correct board (“LOLIN(WEMOS) D1 mini”) and COM port are selected; check that GPIO0 (D3) is not being pulled LOW by external circuits. 3) Wi‑Fi disconnects or board resets: use a stable 5 V/1 A or higher power supply; the ESP8266 can draw peak currents over 300 mA. 4) GPIOs not working as expected: avoid using D3 (GPIO0) and D4 (GPIO2) for outputs that must remain high at boot. 5) 5 V sensors damaging the board: all I/Os are 3.3 V only; always use level shifters when interfacing with 5 V logic.
Can I use the HW‑350B D1 Mini as a web server or MQTT client?
Yes, the ESP8266 can easily run a lightweight HTTP web server or act as an MQTT client. The ESP8266WebServer library lets you create a simple web interface to control GPIOs or display sensor data. For MQTT, the PubSubClient library works reliably. The 4 MB Flash provides plenty of space for both the application code and a small file system (SPIFFS or LittleFS) to store HTML, CSS, and configuration files. The board can serve as a Wi‑Fi gateway, IoT node, or home automation controller without any external processor.
What are the most typical applications for the HW‑350B D1 Mini?
Its tiny size and built‑in Wi‑Fi make it a favourite for IoT sensor nodes, smart home automation (Wi‑Fi relays, lights, switches), weather stations, wireless data loggers, and portable gadgets. It is also widely used in wearable electronics, MQTT‑based sensor networks, and low‑cost prototyping. The compact footprint, USB‑C (or micro‑USB) convenience, and huge library support have made it one of the most popular ESP8266 boards for both beginners and experienced developers.