flowchart TD
    A["Grain Sorter"]

    A --> B["GRAIN FEEDING"]
    A --> C["OPTICAL SENSOR"]
    A --> D["GRAIN SORTING"]
    A --> E["CONTROL AND ALERTS"]

    B --> B1["Hold the grain<br/><i>Hopper / funnel</i>"]
    B --> B2["Release grain slowly<br/><i>Vibrating or screw feeder</i>"]
    B --> B3["Carry grain forward<br/><i>Slide chute / conveyor belt</i>"]

    C --> C1["Spot each grain<br/><i>IR / LDR / colour sensor</i>"]
    C --> C2["Read the sensor data<br/><i>Arduino / ESP32 board</i>"]
    C --> C3["Decide good or bad<br/><i>By colour or size</i>"]

    D --> D1["Push bad grain aside<br/><i>Servo flaps / solenoid / air jet</i>"]
    D --> D2["Store good grain<br/><i>Collection tray / drawer</i>"]
    D --> D3["Store bad grain<br/><i>Reject bin / removable cups</i>"]

    E --> E1["Power the machine<br/><i>DC power supply</i>"]
    E --> E2["Enable/disable<br/><i>ON/OFF switch</i>"]
    E --> E3["Show the result<br/><i>LED / buzzer / OLED</i>"]

    classDef top fill:#2f3e6e,color:#fff,stroke:#1f2a4d
    classDef main fill:#3b6db3,color:#fff,stroke:#2a4f87
    classDef sub fill:#f4f7fb,color:#222,stroke:#9db4d3
    class A top
    class B,C,D,E main
    class B1,B2,B3,C1,C2,C3,D1,D2,D3,E1,E2,E3 sub