WEMOS D1 mini specs & datasheets
The tiny ESP8266 board with a huge shield ecosystem: 34 × 26 mm, 4 MB of flash, USB-serial on board.
- Chip / SoC
- Espressif ESP8266EX
- CPU
- Tensilica L106, 32-bit
- Clock
- 80 MHz (up to 160 MHz)
- RAM
- About 80 KB available for application data
- Flash
- 4 MB
- Wireless
- 2.4 GHz 802.11 b/g/n Wi-Fi
- I/O voltage
- 3.3 V
- Released
- 2016
- Status
- In production
Draft entry: these specs were compiled from the linked sources and are waiting for a second check. Spotted a mistake? Use the form at the end of the page.
Specifications
- Chip / SoC
- Espressif ESP8266EX[1]
- CPU
- Tensilica L106, 32-bit[2]
- Clock
- 80 MHz (up to 160 MHz)[1]
- RAM
- About 80 KB available for application data[2]
- Flash
- 4 MB[1]
- GPIO
- 11 digital I/O[1]
- Analog
- 1 analog input (3.2 V max)[1]
- I/O voltage
- 3.3 V[1]
- Wireless
- 2.4 GHz 802.11 b/g/n Wi-Fi[2]
- USB
- Micro-USB via a CH340[1]
- Dimensions
- 34.2 × 25.6 mm[1]
- Upload limits
- 4 MB flash, 80 KB RAM[4]
Upload limits are what a sketch or firmware may use after the bootloader, as the build tools enforce them, not the chip’s full memory.
Can I still use it?
- Arduino framework
- Community support[3]ESP8266 core for Arduino, maintained by the community.
As published by each project, checked weekly. A platform not listed has no published information here, which is not the same as no support.
Datasheets and documents
Gotchas
- Many versions, many clones. Revisions changed the module and USB chip; clones vary widely in regulator and antenna quality.[1]
History and use today
History
WEMOS (later LOLIN) launched the D1 mini around 2016 with a stackable shield system that made it a go-to for small Wi-Fi gadgets.[1]
Still useful for
Still a cheap, compact ESP8266; the D1 mini ESP32-C3 and S2 variants keep the footprint with newer chips.
Sources
Spotted a mistake?
Every report is read by a person and checked against a source before anything changes. Please link one if you have it.