More powerful version of D1 mini

Basically it's very similar to NodeMCU module. The main difference is size.

Wemos D1 module it's a small board with ESP8266EX chip. On board there is also USB-UART converter (popular CP2104). Because of that, all you need to start programming is simple USB cable.

Wemos D1 provides 9 GPIO ports with PWM, I2C, SPI and 1-Wire support. Thanks to 3.3V LDO module can be powered directly from USB port via microUSB power supply.

They are 3 basic methods to use Wemos. AT commands, LUA programming language with NodeMCU firmware and simplest and our favorite Arduino IDE.

• ESP8266EX chip
• Ceramic 3dB antenna
• U.FL (IPX) antenna socket
• Flash: 16MB
• Wi-Fi in standard 802.11 b/g/n
• WiFi modes: AP (Access Point), STA (Standalone), AP+STA
• Supports TKIP, WEP, CRC, CCMP, WPA/WPA2, WPS
• Supply voltage: 3.3V (or 5V via USB)
• CPU: RISC 80MHz (supports up to 160MHz)
• 9 GPIO - PWM / I2C / SPI / 1-Wire
• Max current on I/O pins: 12mA
• Recommended current on I/O pins: 6mA
• USB-UART converter - CP2104
• ADC - 10-bit
• 16 pins in 2,54mm raster - breadboard compatible
• micro USB B
• Size: 34 x 25mm
• LED connected to GPIO2 (D4)