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WeMos D1 Mini ESP8266 — The Compact IoT Board with a Shield Ecosystem
The WeMos D1 Mini is the maker community's favourite compact ESP8266 board, and for good reason. At just 34.2 × 25.6 mm, it is tiny enough for wearables and embedded enclosures, but comes with a rich ecosystem of stackable mini shields — OLED displays, relay modules, motor drivers, battery shields, DHT sensors, and more — that click directly onto its headers without soldering a single wire.
It is fully compatible with the Arduino IDE and MicroPython, powered by Micro-USB, and includes 4 MB of flash for comfortable firmware development including OTA updates and a file system.
WeMos D1 Mini vs NodeMCU V3 — compact power vs full GPIO access
| Feature | WeMos D1 Mini (this board) | NodeMCU V3 |
|---|---|---|
| Size | 34 × 26 mm — very compact | ~58 × 31 mm — larger |
| Flash | 4 MB | 4 MB |
| GPIO pins | 11 digital + 1 analog | 11 digital + 1 analog |
| Shield ecosystem | ✅ D1 Mini shields (OLED, relay, motor, battery…) | ❌ No dedicated shield ecosystem |
| Breadboard use | Fits with rows free on each side | Spans full breadboard width |
| USB chip | CH340G | CH340G |
| Best for | Compact projects, shield-based builds, wearables | Full GPIO access, general prototyping |
Key features
- Ultra-compact 34 × 26 mm: Fits inside small enclosures, junction boxes, and wearable housings
- D1 Mini shield ecosystem: Relay, OLED, motor driver, battery, sensor shields — all plug directly on
- 4 MB flash: Comfortable for Arduino OTA, MicroPython with filesystem, Lua
- 11 digital GPIO + 1 analog: I2C, SPI, UART, PWM fully available
- Micro-USB: Power and programming from any USB port
- 3.3V logic: Compatible with modern sensors and I2C peripherals
- Arduino IDE, MicroPython, Lua: Code with your preferred language
Technical specifications
| Core Chip | ESP8266 (ESP-12S module) |
|---|---|
| USB Bridge | CH340G |
| Flash Memory | 4 MB |
| Digital GPIO | 11 (PWM, I2C, SPI, UART) |
| Analog Input | 1 × ADC (0–3.3V, 10-bit) |
| WiFi | 802.11 b/g/n, 2.4 GHz |
| Power Input | Micro-USB or 5V pin |
| Logic Level | 3.3V |
| Dimensions | 34.2 × 25.6 mm |
| Shield Compatible | WeMos D1 Mini shields |
Frequently Asked Questions
What D1 Mini shields are available? The ecosystem includes: OLED display shield, single and dual relay shields, motor shield, WS2812B RGB LED shield, DHT11/DHT22 sensor shield, battery shield (LiPo charger), SD card shield, and more.
Can I stack multiple shields? Yes. D1 Mini shields are designed to stack — battery shield on bottom, relay or sensor on top, for example.
Is the D1 Mini the same as the D1 Mini Pro? No. The D1 Mini Pro has an external antenna connector and different flash options. This is the standard D1 Mini with 4 MB flash and onboard PCB antenna.
Do I need to install a driver? Install the CH340G driver for your OS. On Windows it is usually auto-installed; on macOS download the WCH CH340 driver package.
Manila stock. Order before 16:00 PHT, ships today via J&T or LBC. Provincial: 1–3 working days.
Schools / class POs: we accept Purchase Orders for accredited schools and universities. contact us with your PO details.
Returns: 7-day inspection window for DOA units. Email proof of issue and we ship a replacement.
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