flowchart TD subgraph AC_DOMAIN [AC Input And Sockets] AC_IN_L["AC_L_IN"] --> FUSE["Fuse 3.15A T"] --> MOV1["MOV Surge"] --> AC_BUS_L["AC_L_BUS"] AC_IN_N["AC_N_IN"] --> AC_BUS_N["AC_N_BUS"] EARTH_NET["EARTH"] AC_BUS_L --> RELAY_CONTACTS["4x Relay Contacts"] --> SOCKET_L["Socket_L x4"] AC_BUS_N --> SOCKET_N["Socket_N x4"] EARTH_NET --> SOCKET_E["Socket_E x4"] RELAY_CONTACTS --> SNUBBERS["RC Snubber Per Relay"] end subgraph POWER [Power Conversion] AC_BUS_L --> SMPS["Isolated SMPS 230VAC to 5V"] AC_BUS_N --> SMPS SMPS --> V5_MAIN["5V_MAIN"] V5_MAIN --> V5_RELAY["5V_RELAY"] V5_MAIN --> V5_LOGIC["5V_LOGIC"] V5_LOGIC --> LDO33["LDO 3.3V"] --> V33["3V3_MAIN"] LDO33 --> STAR_GND["Star Ground At LDO GND"] STAR_GND --> GND_LOGIC["GND_LOGIC"] STAR_GND --> GND_RELAY["GND_RELAY"] STAR_GND --> GND_ANALOG["GND_ANALOG"] end subgraph CONTROLLER [Controller And Ethernet] V33 --> ESP32["ESP32-S3-WROOM-1"] GND_LOGIC --> ESP32 ESP32 --> RMII["RMII Signals"] --> PHY["LAN8720 PHY"] --> RJ45["RJ45 MagJack"] PHY --> REFCLK["REF_CLK 50MHz to GPIO0"] end subgraph METERING [Energy Metering] ESP32 --> SPI_BUS["SPI SCLK MOSI MISO"] --> ATM1["ATM90E26 x4"] ESP32 --> CS_LINES["CS GPIO4-7"] --> ATM1 ATM1 --> CT_INPUTS["CT Burden Inputs"] ATM1 --> V_SENSE["AC Voltage Divider + RC + Clamp"] V_SENSE --> AC_BUS_L GND_ANALOG --> ATM1 end subgraph RELAYS [Relay Drivers] V5_RELAY --> COILS["Relay Coils x8"] ESP32 --> GPIO_MAP["GPIO15/16 17/18 21/38 39/40"] --> DRIVERS["Opto + NPN Drivers x8"] --> COILS GND_RELAY --> DRIVERS end subgraph UI_ADC [UI And Sensing] ESP32 --> TEMP["NTC to GPIO1"] ESP32 --> EARTH_DET["Earth Detect GPIO2"] ESP32 --> NEUT_DET["Neutral Detect GPIO3"] ESP32 --> LEDS["Green GPIO41 Red GPIO42"] ESP32 --> BUZZ["Buzzer GPIO45 via NPN"] ESP32 --> WIFI_SW["WiFi Switch GPIO46"] end