| Feature | Specification | |--------|----------------| | | ESP32‑WROOM‑32D or ESP32‑S3 (if newer) | | Clock speed | 240 MHz | | Flash / RAM | 4 MB / 520 KB SRAM | | Connectivity | 2.4 GHz Wi‑Fi (802.11 b/g/n), Bluetooth/BLE, plus Ethernet (RJ45, 10/100 Mbps via SPI or MAC‑PHY) | | On‑board peripherals | Buttons (2–3), buzzer, 4‑digit 7‑segment display, light & temp sensor, RGB LED | | I/O expansion | Servo (3‑pin), sensor (4‑pin, I²C+Analog), I²C, UART, GPIO via pin headers | | Power | 5 V via USB‑C or external barrel jack; 3.3 V logic | | Programming | USB‑to‑UART bridge (CP2102 or CH340) |