LOLIN(WEMOS) D1 ESP-WROOM-02
ESP8266 board with WROOM-02 module - Arduino Uno layout with full Wi-Fi capabilities.
68.6 × 53.4 mm
ESP8266
MCU
160MHz
clock
4MB
flash
~80KB
SRAM
17· 1 ADC
GPIO
Wi-Fi
radio
Pinout
Getting started
flash your first firmware in ~2 minutes1
Connect over USB
Install your USB-serial driver (CH340 / CP210x) if no port appears. Not detected? Hold BOOT while plugging in.
2
Match & flash
Set the Tools options shown, then click Upload.
3
Verify it runs
GPIO2 toggles - wire an LED and resistor to it, or change the pin to your board's own LED.
Set these in Tools · leave everything else at default
Arduino IDE 2.x - Tools Copy
Board: "Generic ESP8266 Module"▸
Flash Size: "4MB (32Mb)"▸
CPU Frequency: "160 MHz"▸
Upload Speed: "921600"▸
▸ every other Tools option - leave at default
Board: Generic ESP8266 Module Flash Size: 4MB (32Mb) CPU Frequency: 160 MHz Upload Speed: 921600
Find it: Tools ▸ Board ▸ ESP8266 Boards ▸ Generic ESP8266 Module
// toggle GPIO2 - wire an LED and resistor to it
void setup() {
pinMode(2, OUTPUT);
}
void loop() {
digitalWrite(2, HIGH); delay(500);
digitalWrite(2, LOW); delay(500);
}Specifications
ESP8266 · 68.6 × 53.4 mmCompute
MCU
ESP8266
Clock
160 MHz
SRAM · Flash
~80 KB · 4 MB
Radio
Wi-Fi
802.11 b/g/n
Bluetooth
-
Antenna
PCB
I/O
GPIO · ADC
17 · 1
UART · I²C · SPI
2 · 1 (software) · 1
PWM
-
Power
USB
Micro-USB
Serial
-
Boot address
0x0000
Electrical
Input
5V via USB · 3.3V logic
Consumption
-
Regulator
-
Flashing
Upload · OTA
esptool · esp_ota
Flash · Boot mode
DIO · -
Sketch · Data
- · 80 KB
68.6 × 53.4 mm · pin pitch 2.54 mm
The LOLIN(WEMOS) D1 ESP-WROOM-02 uses esptool for firmware uploads, esp_ota for over-the-air (OTA) updates. Flash mode is DIO.
About this board
The WeMos D1 ESP-WROOM-02 (also written as LOLIN D1 WROOM-02, LOLIN(WEMOS) D1 ESP-WROOM-02, or ESP WROOM 02 D1) is a Wi-Fi development board built around Espressif's ESP-WROOM-02 module, which packages the ESP8266 (Xtensa LX106) with 4 MB of flash and an on-board PCB antenna. It uses an Arduino Uno-style layout, so standard headers and many shields plug in directly, making it handy for Wi-Fi sensors, home automation, and general IoT prototyping. In this guide, you'll find the WeMos D1 ESP-WROOM-02 pinout, datasheet, technical specs, and setup instructions.
Resources
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