USB-C powered low-power temperature and humidity sensor node using an ESP32 Wi‑Fi/BLE module, digital T/RH sensor, protected 5V input, and 3.3V system rail for consumer environmental monitoring.USB-C powered low-power temperature and humidity sensor node using an ESP32 Wi‑Fi/BLE module, digital T/RH sensor, protected 5V input, and 3.3V system rail for consumer environmental monitoring.