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# 基礎知識

## 芯片引腳

以`8266`為例，`GPIO`是芯片引腳，而`D1/D2`是板子引腳。

**知識點**

- `GPIO`為通用輸入輸出
- `GND`為地線
- `3.3v/5v`為直流電?

## 引腳標識



OLED
```
GND = GND
VCC = 3.3v/5v
SCL = GPIO*
SDA = GPIO*
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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