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Arduino - 湿度传感器( Humidity Sensor)
Arduino - 湿度传感器( Humidity Sensor)
在本节中,我们将学习如何将Arduino板与不同的传感器连接。 我们将讨论以下传感器 - 湿度传感器(DHT22) 温度传感器(LM35) 水质探测器传感器(简单水触发器) PIR传感器 超声波传感器 GPSHumidity Sensor (DHT22)DHT-22(也称为AM2302)是数字输出,相对湿度和温度传感器。 它使用电容式湿度传感器和热敏电阻测量周围空气,并在数据引脚上发送数字信号。 在本例中,您将学习如何将此传感器与Arduino UNO配合使用。 室温和湿度将打印到串行监视器上。 DHT-22传感器连接很简单。 左边的第一个引脚为3-5V电源,第二个引脚连接到数据输入引脚,最右边的引脚连接到地。 技术细节Power - 3-5V Max Current - 2.5mA Humidity - 0-100%,准确度2-5% Temperature - 40至80°C,±0.5°C精度 组件的要求 (Components Required)您将需要以下组件 - 1 × Breadboard 1×Arduino Uno R3 1×DHT22 1×10K欧姆电阻 过程 (Procedure)按照电路图并连接面包板上的组件,如下图所示。 草图 (Sketch)在您的计算机上打开Arduino IDE软件。 用Arduino语言编码将控制你的电路。 单击“新建”打开新的草图文件。 Arduino代码 (Arduino Code)// Example testing sketch for various DHT humidity/temperature sensors #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() { delay(2000); // Wait a few seconds between measurements float h = dht.readHumidity(); // Reading temperature or humidity takes about 250 milliseconds! float t = dht.readTemperature(); // Read temperature as Celsius (the default) float f = dht.readTemperature(true); // Read temperature as Fahrenheit (isFahrenheit = 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 to NoteDHT22传感器有四个端子(V cc ,DATA,NC,GND),它们连接到电路板如下 - 数据引脚为Arduino引脚号2 V cc引脚至5伏Arduino板 GND引脚连接到Arduino板的地 我们需要在DATA和V cc引脚之间连接10k欧姆电阻(上拉电阻)完成硬件连接后,您需要将DHT22库添加到Arduino库文件中,如前所述。 结果 (Result)您将在串口监视器上看到温度和湿度显示,每2秒更新一次。 Arduino - 键盘串口( Keyboard Serial) Arduino - 温度传感器( Temperature Sensor).下一篇> |
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