Raspberry Pi Zero HAT-style PCB with bottom 40-pin GPIO header and top-side connectors for MLX90640 thermal camera, SCD41, PIR, IMU, OLED, and thermal sensor terminals.
ESP32 DevKit V1 sensor hub powered from a 12V barrel jack through an LM2596 5V buck converter, with gas, temperature, flame, thermal camera, OLED, relay outputs, buzzer, and ESP32-CAM connections.