Project Documentation

ESP8266 NodeMCU-Based Weather Monitoring Station with LCD Display

Circuit Documentation

Summary

The circuit in question is designed to interface a variety of sensors and an LCD display with an ESP8266 NodeMCU microcontroller. The sensors include a DHT11 temperature and humidity sensor, a rain sensor, and an LDR light sensor with an LM393 comparator. The LCD display is connected via an I2C module to reduce the number of GPIO pins required from the ESP8266. The circuit is likely intended for environmental monitoring, with the capability to display sensor readings and possibly send data over a network using the ESP8266's Wi-Fi capabilities.

Component List

DHT11 Sensor V2

Pins: GND, DAT, VCC
Description: A digital temperature and humidity sensor that provides calibrated digital output.

RAIN SENSOR

Pins: AO, DO, GRD, VCC
Description: An analog and digital sensor for detecting rain or water level.

Sensor LDR LM393

Pins: A0, D0, GND, VCC
Description: A light sensor module that includes an LDR (Light Dependent Resistor) and an LM393 comparator for analog or digital signals.

LCD Display 16x2

Pins: LEDK, LEDA, DB7-DB0, E, RW, RS, VO, VDD, VSS
Description: A 16x2 character LCD display for showing text or numbers.

ESP8266 NodeMCU

Pins: D0-D8, RX, TX, A0, RSV, SD3-SD0, CLK, EN, RST, VIN, 3V3, GND
Description: A Wi-Fi capable microcontroller with a variety of digital and analog pins for interfacing with sensors, actuators, and communication modules.

I2C Module

Pins: VSS, VO, RS, RW, E, DB0-DB7, LEDA, LEDK, GND, VCC, SDA, SCL, VDD
Description: An interface module that allows for I2C communication between the ESP8266 and the LCD display, reducing the number of required GPIO pins.

Wiring Details