LOLIN (Wemos) D1 Mini
Also known as: Wemos D1 Mini · LOLIN D1 Mini · D1 Mini ESP8266 · ESP8266 D1 Mini
The cheapest, smallest way onto Wi-Fi: a thumb-sized ESP8266 with a big shield ecosystem (battery, relay, OLED, DHT). For many people it was the first ESP board they ever flashed.
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At a glance
⚑ flag an error| SoC | ESP8266 |
|---|---|
| Vendor | WEMOS/LOLIN / clones |
| Type | Tiny / minimal |
| Memory | 4 MB flash |
| Display | None |
| Connectivity | Wi-Fi |
| USB | Micro-USB (CH340) |
| Battery | No |
| Typical price | $1-3 (street, varies) |
Good for
Gotchas to know
- ESP8266 is single-core, has no Bluetooth and far fewer GPIO than any ESP32.
- Pin labels (D1, D2...) do not match GPIO numbers: D1 is GPIO5, D2 is GPIO4, and so on.
- Only about 9 usable GPIO, and several (GPIO0/2/15) are strapping pins that affect boot.
- 3.3V logic only; waking from deep sleep needs D0 (GPIO16) wired to RST.
Variants
Many near-identical clones; the 'D1 mini Pro' adds 16MB flash and a u.FL antenna. The 'D1 Mini ESP32' is a different board: same shape, ESP32 chip.
The ESP8266 inside
This board is built on the ESP8266 (ESP8266EX). See the SoC page for the full peripheral, GPIO and security details.
Bare modules on the same SoC:
Resources
Community guides usually go deeper than this page: pinout diagrams, wiring, library setup and copy-paste example code from people who build with these boards daily.