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The WEMOS D1 Esp-Wroom-02 a microcontroller development board with an ESP8266 WiFi chip. The board has a 128×64 (0.96 Inch) OLED screen with an SSD1306 controller, 18650 battery charging circuit and a directional button.

The circuit board comes with a 10 pin header that you can solder onto it. The connections will provide one analog input and five digital inputs/outputs with interrupt/PWM/I2C/one-wire support. The back of the board has a battery holder that supports flat top 18650 batteries. Other characteristics of the board are:

  • MCU: ESP-12E/F
  • Board size: 102x30x20mm
  • Voltage Input range: 5V-12V
  • Micro USB connection
  • Charge Current: 500 mA
  • Battery overcharging and over-discharging protection circuit

Like the other ESP8266 based boards, it can be programmed with the Arduino IDE.

Wemos D1 ESP-Wroom-02 and Arduino IDE: VNG systems unboxing
Unboxing the board
D1 ESP-Wroom-02 Motherboard ESP8266 Mini-WiFi NodeMCU Module ESP8266+18650 Battery+0.96 OLED