- **Compact & powerful**, measured only 58.42x40.64mm (2300x1600mil) packing all the onboard features. - **2x18P pinout layout**, standard pitch 2.54mm (100mil) breadboard friendly, with one side dedicated for peripheral (power, programming, communication) and the other side for GPIO, simplifying wire/trace management. - **Castellated holes & pin header**, choose inter-board connection method according to your application requirement. - **ESP32-WROOM-32UE**, comes with latest [ECO V3](https://www.espressif.com/sites/default/files/documentation/ESP32_ECO_V3_User_Guide__EN.pdfhttps://www.espressif.com/sites/default/files/documentation/ESP32_ECO_V3_User_Guide__EN.pdf) Dual Core 32-bit LX6 microprocessor with clock up to 240MHz, ULP co-processor, 520kB SRAM, 4MB flash. - **802.11b/g/n WiFi Connectivity**, support mode STA/AP/STA+AP mode with external antenna using U.FL/IPEX connector allowing the board to be installed inside the enclosure without worrying transceiver signal quality. - **Bluetooth 4.2 Connectivity**, support classic bluetooth and Low Energy (LE) protocol. - **CP2104 UART to USB Bridge**, full-speed programmer & data port with auto-reset trigger using DTR and RTS line. - **DS3231M RTC**, extremely accurate ±5ppm RTC with alarm trigger capability and replaceable CR1220 battery. Connected via I2C at address 0x68. - **AHT20 Environment Sensor**, temperature and humidity sensor connected via I2C at address 0x38. - **XC6220 LDO**, providing +3.3V power up to 1A with Green Operation mode which automatically switched to power save mode on light load. - **Built-in LED/RGB**, single color active-low LED connected to pin IO2, and SK6812 addressable RGB LED connected to pin IO4. SK6812 data out is exposed so you can chain it up with the rest of the LED circuit. - **MicroSD socket**, connected via SPI with slave select (SS) at pin IO5. - **USB Type-C Connector**, no more hassle when connecting USB cable, plug it in anyway you want. - **26 pin GPIO** @3V3 level, 3xUART, 2xSPI, 2xI2C, 2xI2S, 12bit ADC, 8bit DAC, hall-effect sensing, capacitive sensing, JTAG debug, etc.