DHT22 溫度模組 濕度模組 溫濕度模組 AM2302

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Arduino DHT22溫度模組 濕度模組 溫濕度模組 AM2302

AM2302數位溫濕度感測器是一款含有已校準數位信號輸出的溫濕度複合 感測器。它應用專用的數位模組採集技術和溫濕度傳感技術，確保產品具有極 高的可靠性與卓越的長期穩定性。感測器包括一個電容式感濕元件和一個NTC 測溫元件，並與一個高性能8位單片機相連接。因此該產品具有品質卓越、超 快回應、抗干擾能力強、性價比極高等優點。每個AM2302感測器都在極為精確 的濕度校驗室中進行校準。校準係數以程式的形式儲存在OTP記憶體中，感測器 內部在檢測信號的處理過程中要調用這些校準係數。單線制序列介面，使系統 集成變得簡易快捷。超小的體積、極低的功耗，信號傳輸距離可達20米以上， 使其成為各類應用甚至最為苛刻的應用場合的最佳選則。產品為 4 針單排引 腳封裝。連接方便，特殊封裝形式可根據使用者需求而提供。

一、參數說明:

1. 工作電壓:3V–5.5V
2. 傳感器型號:奧松AM2302溫濕度傳感器
3. 信號輸出形式:數字信號
4. 溫度測量範圍:-40℃–80℃
5. 測量精度:0.5℃
6. 濕度測量範圍:0–100%RH
7. 測量精度:2%RH
8. 分辨率:16位
9. 帶固定螺絲孔,方便安裝及固定。孔徑2.6mm

二、接線說明:

“+”:接電源正極
“-“:接電源負極
NC:空腳
“out”:接單片機IO口

AM2302 感測器模組原廠元件 https://cdn-shop.adafruit.com/datasheets/Digital+humidity+and+temperature+sensor+AM2302.pdf

函數庫https://github.com/adafruit/DHT-sensor-library

三 、Arduino 範例

// Example testing sketch for various DHT humidity/temperature sensors
// Written by ladyada, public domain

#include "DHT.h"

#define DHTPIN 2     // what digital pin we're connected to

// Uncomment whatever type you're using!
//#define DHTTYPE DHT11   // DHT 11
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
//#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.
// Note that older versions of this library took an optional third parameter to
// tweak the timings for faster processors.  This parameter is no longer needed
// as the current DHT reading algorithm adjusts itself to work on faster procs.
DHT dht(DHTPIN, DHTTYPE);

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 (the default)
  float t = dht.readTemperature();
  // Read temperature as Fahrenheit (isFahrenheit = true)
  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 in Fahrenheit (the default)
  float hif = dht.computeHeatIndex(f, h);
  // Compute heat index in Celsius (isFahreheit = false)
  float hic = dht.computeHeatIndex(t, h, false);

  Serial.print("Humidity: ");
  Serial.print(h);
  Serial.print(" %t");
  Serial.print("Temperature: ");
  Serial.print(t);
  Serial.print(" *C ");
  Serial.print(f);
  Serial.print(" *Ft");
  Serial.print("Heat index: ");
  Serial.print(hic);
  Serial.print(" *C ");
  Serial.print(hif);
  Serial.println(" *F");
}