Interface DHT 11 Sensor with ESP8266 (Node MCU)

Before that a brief overview of DHT 11

DHT11 sensor consists of a capacitive humidity sensing element and a thermistor for sensing temperature.  The humidity sensing capacitor has two electrodes with a moisture-holding substrate as a dielectric between them. Change in the capacitance value occurs with the change in humidity levels. The IC measure, process these changed resistance values and change them into digital form

Let’s Start

✘ Connect Vcc pin of the sensor to 3V3 pin of Node MCU.

✘ Connect GND pin of the sensor to GND pin of Node MCU.

✘ Connect signal pin of the sensor to D5 pin of Node MCU.

Install DHT Library.

Go to menu Sketch – Include Library -Manage Library

Program

Go to menu File >> Example >> DHT sensor library >>

DHT_Unified_Sensor

Interface sensors with Node MCU.

1. Comment the 20^th line in the code.
2. Uncomment the 19^th line in the code.
3. Change the pin number from 2 to 5 in 14^th line of the code.