Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes a DHT11 temperature and humidity sensor, an ESP8266 NodeMCU microcontroller, an LDR (Light Dependent Resistor), a bulb, a battery pack, a fan, and a two-channel relay module. The circuit is designed to monitor environmental conditions and control the bulb and fan based on sensor inputs.

Component List

1. DHT11 Temperature and Humidity Sensor

   • Pins: VCC, GND, DATA
   • Description: Measures temperature and humidity.
   • Purpose in Circuit: Provides environmental data to the microcontroller.

2. ESP8266 NodeMCU

   • Pins: D0, D1, D2, D3, D4, 3V3, GND, D5, D6, D7, D8, RX, TX, A0, RSV, SD3, SD2, SD1, CMD, SD0, CLK, EN, RST, VIN
   • Description: Wi-Fi enabled microcontroller.
   • Purpose in Circuit: Central control unit for processing sensor data and controlling the relay module.

3. LDR (Light Dependent Resistor)

   • Pins: A0, D0, GND, VCC
   • Description: Measures ambient light levels.
   • Purpose in Circuit: Provides light level data to the microcontroller.

4. Bulb

   • Pins: +, -
   • Description: Light source.
   • Purpose in Circuit: Controlled by the relay module to turn on/off based on sensor data.

5. Battery Pack

   • Pins: +, -
   • Description: Power source.
   • Purpose in Circuit: Provides power to the fan and bulb.

6. Fan

   • Pins: GND, 5V
   • Description: Cooling device.
   • Purpose in Circuit: Controlled by the relay module to turn on/off based on sensor data.

7. Two Channel Relay 5V

   • Pins: VCC, IN2, IN1, GND, NC2, C2, NO2, NC1, C1, NO1
   • Description: Relay module for controlling high-power devices.
   • Purpose in Circuit: Controls the bulb and fan based on signals from the microcontroller.

Wiring Details

DHT11 Temperature and Humidity Sensor

• VCC: Connected to 3V3 of ESP8266 NodeMCU
• GND: Connected to GND of ESP8266 NodeMCU
• DATA: Connected to D3 of ESP8266 NodeMCU

ESP8266 NodeMCU

• 3V3: Connected to VCC of DHT11 and VCC of LDR
• GND: Connected to GND of DHT11, GND of LDR, and GND of Two Channel Relay 5V
• D2: Connected to D0 of LDR
• D3: Connected to DATA of DHT11
• D4: Connected to IN2 of Two Channel Relay 5V
• D6: Connected to IN1 of Two Channel Relay 5V

LDR (Light Dependent Resistor)

• VCC: Connected to 3V3 of ESP8266 NodeMCU
• GND: Connected to GND of ESP8266 NodeMCU
• D0: Connected to D2 of ESP8266 NodeMCU

Bulb

• +: Connected to NC2 of Two Channel Relay 5V
• -: Connected to - of Battery Pack

Battery Pack

• +: Connected to C2 and C1 of Two Channel Relay 5V
• -: Connected to GND of Fan and - of Bulb

Fan

• 5V: Connected to NC1 of Two Channel Relay 5V
• GND: Connected to - of Battery Pack

Two Channel Relay 5V

• VCC: Connected to 3V3 of ESP8266 NodeMCU
• GND: Connected to GND of ESP8266 NodeMCU
• IN2: Connected to D4 of ESP8266 NodeMCU
• IN1: Connected to D6 of ESP8266 NodeMCU
• NC2: Connected to + of Bulb
• C2: Connected to + of Battery Pack
• NC1: Connected to 5V of Fan
• C1: Connected to + of Battery Pack

Code

No code is provided for this circuit.