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ocrobot:modules:dht11

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ocrobot:modules:dht11 [2017/10/04 08:35] – 已恢复为旧版 (2017/04/07 10:03) 弘毅ocrobot:modules:dht11 [2023/06/07 04:23] (当前版本) – 外部编辑 127.0.0.1
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 +[[:ocrobot:modules|返回]]
 +=====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:
 +
 + {{:en:ocrobot:modules:dht_sensor.zip|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====
 +{{:en:ocrobot:modules:dht11.jpg|}}
 +====简易使用教程====
 +===接线图===
 +电阻使用10k电阻
 +
 +{{:en:ocrobot:modules:dhtwiring.gif|}}
 +
 +
 +====演示程序（基于arduino）====
 +
 +<code cpp>
 +// 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");
 +}
 +</code>
 +====相关资料====
 +{{:en:ocrobot:modules:dht11-chinese.pdf|DHT11数据手册（中文）}}
  

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