The Espressif ESP32-C3-WROOM-02-H4 is a compact SMD Wi-Fi and Bluetooth 5 (LE) module designed for reliable, low-power IoT and industrial applications. Powered by a single-core 32-bit RISC-V processor running up to 160 MHz, it integrates 4 MB SPI flash, 400 KB SRAM, and 384 KB ROM. Supporting 2.4 GHz Wi-Fi (802.11 b/g/n) and Bluetooth LE 5.0, the module combines robust wireless performance with a built-in PCB antenna. Measuring 18 × 20 × 3.2 mm, it offers versatile peripheral connectivity including GPIO, UART, SPI, I²C, I²S, and ADC interfaces, and operates across a wide –40 °C to +105 °C temperature range, making it ideal for smart home, sensor, and industrial control designs.