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DHT11温度传感器

这是DHT11温湿度传感器介绍页面


引言

DHT11温湿度传感器是一款廉价的温度湿度传感器,使用单总线通讯协议,使用方便,arduino驱动方案推荐使用DHT-sensor-library驱动库

DHT11传感器提供了测量温度湿度的极其廉价的解决方案,适合业余爱好者进行一些基础数据记录,虽然传感器的速度非常缓慢。

产品规格

3V-5V电源

2.5mA最大电流需求

20%-80% 湿度测量范围 5%误差

0℃-50℃温度测量范围 ±2℃误差

I2C数据接口


驱动

arduino驱动库下地址:

DHT-sensor-library

以上库文件解压缩后需放到<你的arduino主目录>/libraries/下

此库适用于目前1.04及以前版本(不低于1.0版本),更新的兼容性请关注github跟新信息

该项目github托管地址

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


产品照片

简易使用教程

接线图

电阻使用10k电阻

演示程序(基于arduino)

// Example testing sketch for various DHT humidity/temperature sensors
// Written by ladyada, public domain
 
#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.
// 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(" *F\t");
  Serial.print("Heat index: ");
  Serial.print(hic);
  Serial.print(" *C ");
  Serial.print(hif);
  Serial.println(" *F");
}

相关资料

ocrobot/modules/dht11.txt · 最后更改: 2023/06/07 04:23 由 127.0.0.1