The Espressif ESP32-WROOM-32D is a Wi-Fi + Bluetooth 4.2 module based on the dual-core Xtensa® LX6 MCU (80–240 MHz), featuring 520 KB SRAM, 4 MB SPI flash, and advanced low-power modes for IoT and wearable devices. With an onboard PCB antenna, it integrates Wi-Fi (802.11 b/g/n), Bluetooth Classic + BLE, capacitive touch, ADC/DAC, SPI, I²C, I²S, UART, and SD card interfaces, making it ideal for sensor networks, streaming, and data logging applications.