# Grove – 皮膚電GSR反應感測器
{% hint style="danger" %} **注意：**
* **本感測器不能用於醫療目的。**
* **Grove-GSR 感測器測量的是人體的電阻，而不是電導率！**
{% endhint %}
### 測量前準備
1. GSR(皮膚電反應感測器)將布套分別套在食指和中指(或中指與無名指)，以此來測量人體的電阻值。
2. 電極的插座接感測器
3. Grove 接公 – 母 杜邦線
### **Grove – 皮膚電GSR反應感測器電路圖**
* Raspberry Pi Pico W
* Raspberry Pi Pico W 擴充板
* Grove – 皮膚電GSR反應感測器
* 公 – 母 杜邦線
{% hint style="success" %}
***Grove – 皮膚電 GSR 反應感測器是類比訊號輸入。本範例模組的 SIG 腳位需接至Raspberry Pi Pico擴充板 A0/D26 腳位。***
{% endhint %}
### **Arduino 程式如下**
```
const int GSR = A0;
int sensorValue = 0;
int gsr_average = 0;
void setup() {
analogReadResolution(12); // 設定為 12-bit → 0~4095
Serial.begin(9600);
}
void loop() {
long sum = 0;
// 取 10 次平均
for (int i = 0; i < 10; i++) {
sensorValue = analogRead(GSR);
sum += sensorValue;
delay(5);
}
gsr_average = sum / 10;
Serial.print("GSR : ");
Serial.print(gsr_average);
Serial.print(" | State:");
// ---------- 狀態判斷區(數值可以調整) ----------
if (gsr_average >= 2800) {
Serial.println("Relax");
}
else if (gsr_average >= 1600) {
Serial.println("Normal");
}
else if (gsr_average >= 800) {
Serial.println("Stress");
}
else {
Serial.println("High Stress");
}
// -------------------------------------
delay(200);
}
```
### **程式執行結果**
在序列埠監控視窗會顯示數值，根據類比數值高低，判斷使用者的皮膚乾濕程度與交感神經反應，並輸出「Relax」、「Normal」、「Stress」或 「High Stress」四種狀態。
高數值代表皮膚較乾燥且較放鬆，低數值則代表皮膚導電度上升、壓力較高。
---
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