WEMOS D1 module it’s a small board with ESP8266-12F. On board there is also USB-UART converter (popular CH340). Because of that, all you need to start programming is simple USB cable.
- Embeded ESP8266-12F with PCB antena
- Supply voltage: 3.3V (or 5V via USB)
- 9 GPIO – PWM / I2C / SPI / 1-Wire
- Max current on I/O pins: 12mA
- Recommended current on I/O pins: 6mA
- USB-UART converter – CH340
- ADC – 10-bit
- 16 pins in 2,54mm raster – breadboard compatible
- micro USB B
- Size: 34 x 25mm
- LED connected to GPIO2 (D4)
More information:
https://nettigo.eu/products/wemos-d1-mini-v2-wifi-module