# Raspberry Pi Pico 擴充板
## Raspberry Pi Pico 擴充板介紹
**擴充板各個組件可分成以下六種，如下圖所示:**
**各個組件功能名稱，如下表所示:**
## **擴充板供電使用方法**
由於Raspberry Pi Pico 開發板上無電源指示燈，故在Raspberry Pi Pico 擴充板中，便設計了一顆電源指示LED燈，以了解目前是否為供電狀態。
### **由Raspberry Pi Pico USB供電**
使用Micro USB供電，可以將電源切換開關切到INT\_5V(INTERNAL，內部電源)，如下圖所示:
使用Micro USB供電，也可將電源切換開關切到EXT\_5V(EXTERNAL，外部電源)，如下圖所示:
### **由Raspberry Pi Pico USB供電**
{% hint style="info" %}
DC變壓器的接頭尺寸需為**5.5mm/2.0mm**，並且**接頭需內部為正極，外部為負極，如果內外極性相反，則會溶斷保險絲****。**若保險絲已溶斷，可到電子材料行購買，替換即可。
但請注意，使用外部供電之DC變壓器，一定**只需能5V的電源輸出，不可大於5V****。**若高於5V，則Raspberry Pi Pico開發板可能會損毀。
{% endhint %}
由外部電源接頭供電，若未切換至EXT\_5V，則電源指示LED燈熄滅，表示未供電，如下圖所示:
若切至EXT\_5V，則電源供應指示LED燈亮起，此時代表供電中，如下圖所示:
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