Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes a NodeMCU V3 ESP8266 microcontroller, a buzzer, a PIR sensor, a DHT11 humidity and temperature sensor, an LDR module, and an MQ-2 gas sensor. The circuit is designed to monitor environmental conditions and trigger alerts based on sensor inputs.

Component List

1. NodeMCU V3 ESP8266

   • Description: A microcontroller with built-in Wi-Fi capabilities, used for controlling the circuit and processing sensor data.
   • Pins: A0, GND, VU, S3, S2, S1, SC, S0, SK, 3V3, EN, RST, Vin, D0, D1, D2, D3, D4, D5, D6, D7, D8, RX, TX

2. Buzzer

   • Description: An audio signaling device used to produce sound alerts.
   • Pins: PIN, GND

3. PIR Sensor

   • Description: A passive infrared sensor used to detect motion.
   • Pins: VDD, SIG, GND

4. DHT11 Humidity and Temperature Sensor

   • Description: A sensor used to measure humidity and temperature.
   • Pins: VDD, DATA, NULL, GND

5. LDR Module 3 Pin

   • Description: A light-dependent resistor module used to detect light intensity.
   • Pins: VCC, GND, DO

6. MQ-2 Gas Sensor

   • Description: A sensor used to detect gas levels.
   • Pins: GND, VCC, ANALOG, Digital

Wiring Details

NodeMCU V3 ESP8266

• A0: Connected to MQ-2 (ANALOG)
• GND: Connected to MQ-2 (GND), PIR Sensor (GND), DHT11 (GND), Buzzer (GND), LDR Module (GND)
• 3V3: Connected to MQ-2 (VCC), LDR Module (VCC), PIR Sensor (VDD), DHT11 (VDD)
• D0: Connected to Buzzer (PIN)
• D1: Connected to LDR Module (DO)
• D3: Connected to DHT11 (DATA)
• D5: Connected to PIR Sensor (SIG)

Buzzer

• PIN: Connected to NodeMCU V3 ESP8266 (D0)
• GND: Connected to NodeMCU V3 ESP8266 (GND)

PIR Sensor

• VDD: Connected to NodeMCU V3 ESP8266 (3V3)
• SIG: Connected to NodeMCU V3 ESP8266 (D5)
• GND: Connected to NodeMCU V3 ESP8266 (GND)

DHT11 Humidity and Temperature Sensor

• VDD: Connected to NodeMCU V3 ESP8266 (3V3)
• DATA: Connected to NodeMCU V3 ESP8266 (D3)
• GND: Connected to NodeMCU V3 ESP8266 (GND)

LDR Module 3 Pin

• VCC: Connected to NodeMCU V3 ESP8266 (3V3)
• GND: Connected to NodeMCU V3 ESP8266 (GND)
• DO: Connected to NodeMCU V3 ESP8266 (D1)

MQ-2 Gas Sensor

• GND: Connected to NodeMCU V3 ESP8266 (GND)
• VCC: Connected to NodeMCU V3 ESP8266 (3V3)
• ANALOG: Connected to NodeMCU V3 ESP8266 (A0)

Code

No code is provided for this circuit.