DHT22 (AM2302) 高精度數位溫濕度感測器模組 | 支援 Arduino/樹莓派

商品說明

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。專用的數位模組採集技術和溫濕度感測技術，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。
 

DHT22 參數說明

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

DHT22 接線說明

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

DHT22  – 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");
}

文檔資料

• AM2302 感測器模組原廠元件
• 函數庫

本產品資訊由供應商提供，經台灣物聯科技實測整理後彙整