# ESP32使用DHT11溫濕度辨識結合LED燈

### ESP32-WROOM-32腳位圖

### 使用材料
1. ESP32-WROOM-32*1
2. 三色LED全彩模組*1
3. DHT11溫溼度感測器

### LED使用到的引腳

| 顏色 | 引腳 |
| -------- | -------- |
| 紅色 | GPIO15 |
| 綠色 | GPIO2 |
| 藍色 | GPIO4 |
| 接地 | GND |

### DHT11使用到的引繳
| DHT11 | 引腳 |
| -------- | -------- |
| - | GND |
| + | VIN |
| OUT | RX2(16) |

### 接線圖

## 程式碼

#include <DHT.h>
#define DHT11PIN  16
DHT dht(DHT11PIN, DHT11);

const int redPin = 15;
const int greenPin = 2;
const int bluePin = 4;
float humi;
float temp;
void setup() {
  Serial.begin(115200);
  dht.begin();

  pinMode(redPin, OUTPUT); 
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
  // light
  analogWrite(redPin, 128);
  analogWrite(greenPin, 128); 
  analogWrite(bluePin, 128); 

}

void humi_temp(){
  humi = dht.readHumidity();
  temp = dht.readTemperature();
  Serial.print("Temp: ");
  Serial.print(temp);
  Serial.print("Humi: ");
  Serial.println(humi);
  delay(1000);
}

void RedLed(){
  analogWrite(redPin, 255);
  analogWrite(greenPin, 0);
  analogWrite(bluePin, 0);
}
void GreenLed(){
  analogWrite(redPin, 0);
  analogWrite(greenPin, 255);
  analogWrite(bluePin, 0);
}
void BlueLed(){
  analogWrite(redPin, 0);
  analogWrite(greenPin, 0);
  analogWrite(bluePin, 255);
}
void loop() {


  humi_temp();
  if(temp>26 && temp <28){
    Serial.print("超過26");
    GreenLed();
  }
  if(temp>=28){
    Serial.print("超過28");
    RedLed();
  }
  if(temp<26){
    Serial.print("低於26");
    BlueLed();
  }
}

---
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