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Experiment

The document outlines an experiment to interface a DHT11 temperature and humidity sensor with an Arduino Uno, detailing the materials required and step-by-step procedures for wiring, software setup, code uploading, and viewing results. It includes code snippets for reading temperature and humidity data, which are displayed on the Serial Monitor. The experiment concludes that the DHT11 sensor effectively measures ambient conditions, though with some limitations in accuracy and refresh rate.

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charangandhar005
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20 views4 pages

Experiment

The document outlines an experiment to interface a DHT11 temperature and humidity sensor with an Arduino Uno, detailing the materials required and step-by-step procedures for wiring, software setup, code uploading, and viewing results. It includes code snippets for reading temperature and humidity data, which are displayed on the Serial Monitor. The experiment concludes that the DHT11 sensor effectively measures ambient conditions, though with some limitations in accuracy and refresh rate.

Uploaded by

charangandhar005
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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Experiment:4

Name:
Reg no:
Measuring Temperature and Humidity using DHT11 Sensor
with Arduino Uno
Aim: To interface a DHT11 temperature and humidity sensor with an Arduino Uno board and
display the readings on the Serial Monitor.

Materials Required:

 Arduino Uno board


 DHT11 Temperature and Humidity Sensor
 Jumper wires
 USB cable

Procedure:

1. Wiring:
o Connect the VCC pin of the DHT11 sensor to the 5V pin on the Arduino Uno.
o Connect the GND pin of the DHT11 sensor to the GND pin on the Arduino Uno.
o Connect the data pin (usually the middle pin) of the DHT11 sensor to digital pin 8
on the Arduino Uno. (You can change this in the code if needed).
2. Software Setup:
o Open the Arduino IDE on your computer.
o If you haven't already, install the Adafruit DHT Sensor Library and the Adafruit
Unified Sensor Library. Go to Sketch -> Include Library -> Manage Libraries...
and search for them. Install both.
o Copy and paste the following code into the Arduino IDE:

C++

#include <Adafruit_Sensor.h> // Required for Adafruit DHT sensors


#include <DHT.h> // The actual DHT library

#define DHTPIN 8 // Digital pin connected to DHT sensor


#define DHTTYPE DHT11 // DHT 11 <- IMPORTANT: Define DHT11

DHT dht(DHTPIN, DHTTYPE); // Create DHT object

void setup() {
Serial.begin(9600);
Serial.println("DHT11 test!");
dht.begin();
}

void loop() {
float h = dht.readHumidity();
float t = dht.readTemperature();
float f = dht.readTemperature(true); // Read temperature as
Fahrenheit (optional)

if (isnan(h) || isnan(t) || isnan(f)) { // Check for errors!


Serial.println(F("Failed to read from DHT sensor!"));
return; // Exit the loop if there's an error
}

Serial.print(F("Humidity: "));
Serial.print(h);
Serial.print(F("% "));
Serial.print(F("Temperature: "));
Serial.print(t);
Serial.print(F(" *C "));
Serial.print(f);
Serial.println(F(" *F"));

delay(2000); // Wait 2 seconds (DHT11 needs time between


readings)
}

3. Upload Code:
o Connect your Arduino Uno to your computer using the USB cable.
o Select the correct board and port in the Arduino IDE (Tools -> Board and Tools -
> Port).
o Click the "Upload" button (the arrow icon) to upload the code to your Arduino.
4. View Results:
o Open the Serial Monitor (Tools -> Serial Monitor or Ctrl+Shift+M).
o Make sure the baud rate in the Serial Monitor is set to 9600.
o You should now see the temperature and humidity readings displayed in the Serial
Monitor.

Circuit:
Hardware component executed component

Result:

Inference:

The DHT11 sensor successfully measures the ambient temperature and relative humidity. The
readings are displayed on the Serial Monitor. Observe the temperature values in Celsius (°C) and
Fahrenheit (°F), as well as the humidity percentage. Note that the DHT11 has a specified
accuracy range, so the readings might not be perfectly precise. Also, the DHT11 has a slow
refresh rate, which is why we have a 2-second delay in the loop() function.

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