Arduino Uno 和 DHT11/DHT22 溫溼度感測器
阿新 • • 發佈:2019-01-07
DHT11/DHT22
本例程使用的是DHT11這個模組
實驗效果
BOM表
Arduino Uno *1
DHT11溫溼度感測器 *1
跳線若干
接線
Arduino Uno <------> DHT11溫溼度感測器
Pin 2 <------> DATA
5V <------> VCC
GND <------> GND
程式碼
請下載庫檔案,放在對應的Arduino 庫資料夾裡
#include "DHT.h" #define DHTPIN 2 // what pin we're connected to // Uncomment whatever type you're using! #define DHTTYPE DHT11 // DHT 11 //#define DHTTYPE DHT22 // DHT 22 (AM2302) //#define DHTTYPE DHT21 // DHT 21 (AM2301) // Connect pin 1 (on the left) of the sensor to +5V // NOTE: If using a board with 3.3V logic like an Arduino Due connect pin 1 // to 3.3V instead of 5V! // Connect pin 2 of the sensor to whatever your DHTPIN is // Connect pin 4 (on the right) of the sensor to GROUND // Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor // Initialize DHT sensor for normal 16mhz Arduino DHT dht(DHTPIN, DHTTYPE); // NOTE: For working with a faster chip, like an Arduino Due or Teensy, you // might need to increase the threshold for cycle counts considered a 1 or 0. // You can do this by passing a 3rd parameter for this threshold. It's a bit // of fiddling to find the right value, but in general the faster the CPU the // higher the value. The default for a 16mhz AVR is a value of 6. For an // Arduino Due that runs at 84mhz a value of 30 works. // Example to initialize DHT sensor for Arduino Due: //DHT dht(DHTPIN, DHTTYPE, 30); void setup() { Serial.begin(9600); Serial.println("DHTxx test!"); dht.begin(); } void loop() { // Wait a few seconds between measurements. delay(2000); // Reading temperature or humidity takes about 250 milliseconds! // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor) float h = dht.readHumidity(); // Read temperature as Celsius float t = dht.readTemperature(); // Read temperature as Fahrenheit float f = dht.readTemperature(true); // Check if any reads failed and exit early (to try again). if (isnan(h) || isnan(t) || isnan(f)) { Serial.println("Failed to read from DHT sensor!"); return; } // Compute heat index // Must send in temp in Fahrenheit! float hi = dht.computeHeatIndex(f, h); Serial.print("Humidity: "); Serial.print(h); Serial.print(" %"); Serial.print("\t"); Serial.print("Temperature: "); Serial.print(t); Serial.println(" *C "); //Serial.print(f); // Serial.print(" *F\t"); // Serial.print("Heat index: "); // Serial.print(hi); // Serial.println(" *F"); }