DHT11 TEMPERATURE SENSOR INTERFACING WITH NODEMCU
In this, we are going to interface the DHT11 temperature sensor to the NodeMCU board and programming with Arduino IDE. Here DHT11 sensor measures the temperature and humidity in the air surrounded by the sensor and is displayed on the serial monitor.
Synopsis

In this, we are going to interface the DHT11 temperature sensor to the NodeMCU board and programming with Arduino IDE. Here DHT11 sensor measures the temperature and humidity in the air surrounded by the sensor and is displayed on the serial monitor.

Description


DHT11(Temperature Sensor)

DHT11 is a commonly digital temperature sensor used to measure the humidity and temperature and we can also interface this sensor easily with any microcontroller such as Arduino, RPi (Raspberry Pi), etc. For measuring temperature and humidity DHT11 sensor is available in the module as well as in sensor.

Applications

We can use a DHT11 sensor in many applications such as

• HVAC (Heating, Ventilation, Air Conditioning)

• Home appliances

• Weather stations etc.

NodeMCU

A NodeMCU is a development board with an inbuilt Wi-Fi module in it. It is a basic and cost-efficient board to carry out projects using the internet of things. The NodeMCU has an ESP8266 microcontroller unit in it. The operation of this microcontroller is controlled with the programs used in Arduino thus making it very easier to use and also to learn basic IoT projects. This board has an inbuilt 2.4GHz antenna to receive Wi-Fi functions. This board has a memory of 4mb to store the data acting as ROM and 64Kb of RAM. This board operates at 3.3 volts and it is mandatory to operate the board at this voltage and not more than that as increasing the input voltage in this board may damage few GPIO pins (general input-output pins).


Pin Configuration

1. Vin: 3.3V can be provided at this pin as the supply to power on the board. This pin is used to power on the entire microcontroller.

2. GND: This pin is connected to negative terminal of the battery.

3. RST: This pin resets the microcontroller and clears the memory.

4. EN: This pin is used to enable the operation of microcontroller.

5. 3V3: This pin provides 3V output and this can be used to power up some sensor units connected to the microcontroller.

6. SD1, CMD, SD0, CLK: These pins are used in SPI communication, that is it is used to transfer the signals between two microcontrollers, Rx and Tx modules with asynchronous transmission.

7. SD3, SD2: These pins can also function as asynchronous transmission or as GPIO pins.

8. RSV: These are two reserved pins used by the microcontroller and cannot be used in connecting any external circuits to it.

9. A0: This microcontroller only has one analog pin for Analog communication. This A0 pin is used in analog signal communication.

10. GPIO 1 – 16: This controller board has 16 input-output pins which be used as input or output pin based on the programming.

11. GP10 1, 3, 13, 15: This microcontroller has 2 UART communication pins, RX0, TX0 (GPIO 1 & GPIO 3) and RX1, TX1 (GPIO 13, GPIO15).

Pin Configuration for DHT11(temperature sensor)

DHT11 consists of three pins they are:

• Vcc (power supply) 3.3v to 5v

• Data

• Ground


Procedure

1. Download the DHT11 library and include that into Arduino IDE.

2. Upload your code into your NodeMCU board.

3. Open Serial Monitor with 9600 baud rate you will find the Humidity and Temperature values.

Schematic


Code

#include "dht.h"
#define dht_apin D1
dht DHT;

void setup() {
 Serial.begin(9600);       // 9600 BITS TRANFERING TO PC PER SECOND
}

void loop() {
  DHT.read11(dht_apin);
  Serial.print("Temperature: "); Serial.print(DHT.temperature); Serial.print("\t");
  Serial.print("Humidity: "); Serial.println(DHT.humidity);
  delay(1000);
}

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