add schema

MOC3041.md

@@ -18,4 +18,33 @@ To test an MOC3041 optoisolator (a zero-crossing triac driver) with low voltage,
 
 **Optional**:
 
-- You can use a multimeter in AC mode across the load to verify switching.
+- You can use a multimeter in AC mode across the load to verify switching.
+
+---
+
+## Schematic Diagram
+
+```mermaid
+graph TD
+    A[5V DC] -- 220Ω --|Pin 1| B(MOC3041 LED Anode)
+    B --|Pin 2| C(GND)
+    
+    subgraph Output Side (Triac)
+        D(AC Live 12V) --|Pin 6| E(MOC3041 Triac MT2)
+        E --|Pin 4| F(MOC3041 Triac MT1)
+        F -- Load --> G(AC Neutral)
+    end
+    
+    style B fill:#f9f,stroke:#333,stroke-width:2px
+    style E fill:#bbf,stroke:#333,stroke-width:2px
+    style F fill:#bbf,stroke:#333,stroke-width:2px
+    style D fill:#fff,stroke:#333,stroke-width:2px
+    style G fill:#fff,stroke:#333,stroke-width:2px
+    style A fill:#fff,stroke:#333,stroke-width:2px
+    style C fill:#fff,stroke:#333,stroke-width:2px
+    style F fill:#bbf,stroke:#333,stroke-width:2px
+    style G fill:#fff,stroke:#333,stroke-width:2px
+    style D fill:#fff,stroke:#333,stroke-width:2px
+    style E fill:#bbf,stroke:#333,stroke-width:2px
+    style Load fill:#ff9,stroke:#333,stroke-width:2px
+```