DHT11
Description
The DHT11 is a digital temperature and humidity sensor module widely used in various electronics and IoT projects. It consists of a capacitive humidity sensor and a thermistor to measure temperature.
Sensor Details
Tech Specs for the DHT11 temperature and humidity sensor:
- Operating Voltage: 3.3V to 5V
- Current Consumption: 1.5mA
- Temperature Measurement Range: 32ºF to 122ºF( 0ºC to 50ºC)
- Temperature Measurement Accuracy: ±2ºC
- Temperature Measurement Resolution: 1ºC
- Humidity Measurement Range: 20% to 90% RH
- Humidity Measurement Resolution: ±5% RH
- Digital Out Signal Transmission Range:
- Dimensions: .75in X 1.77in (2cm x 4.5cm)
Wiring Details
- DHT11 Sensor GND to Arduino GND
- DHT11 Sensor Vcc+ to Arduino +5V
- DHT11 Sensor Signal to Arduino PIN 2
Circuit Image
Circuit Code
#include "DHT.h"
#define DHTPIN 2 // we're using pin 2
#define DHTTYPE DHT11 // we're using the DHT11
// define our DHT object using the pin and type from above
DHT dht(DHTPIN, DHTTYPE);
void setup() {
Serial.begin(9600);
}
void loop() {
// create a float and read the temperature sensor
float myTemperature = dht.readTemperature(true);
// print the temperature on the screen in Celsius
Serial.print(myTemperature);
Serial.print((char)223); // degree symbol
Serial.println("C");
delay(3000); // wait 3 seconds before updating again
}