Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes an ESP8266 NodeMCU microcontroller, a buzzer, a DHT11 temperature and humidity sensor, an MQ135 gas sensor, a KY-026 flame sensor, and a 0.96" OLED display. The circuit is designed to monitor environmental conditions and display the data on the OLED screen, with an alert system using the buzzer.

Component List

1. ESP8266 NodeMCU

   • Description: A low-cost Wi-Fi microcontroller with GPIO, ADC, and PWM capabilities.
   • 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

2. Buzzer

   • Description: An audio signaling device.
   • Pins: PIN, GND

3. DHT11

   • Description: A temperature and humidity sensor.
   • Pins: DATA, GND, VCC

4. MQ135

   • Description: A gas sensor for detecting air quality.
   • Pins: VCC, GND, A0, D0

5. KY-026 Flame Sensor

   • Description: A sensor for detecting flame or fire.
   • Pins: AO, GND, VCC, DO

6. 0.96" OLED

   • Description: A small OLED display for visual output.
   • Pins: GND, VDD, SCK, SDA

Wiring Details

ESP8266 NodeMCU

• D1 is connected to SCK of the 0.96" OLED.
• D2 is connected to SDA of the 0.96" OLED.
• D4 is connected to DATA of the DHT11.
• 3V3 is connected to VCC of the DHT11, MQ135, 0.96" OLED, and KY-026 Flame Sensor.
• GND is connected to GND of the DHT11, MQ135, 0.96" OLED, KY-026 Flame Sensor, and buzzer.
• D5 is connected to PIN of the buzzer.
• A0 is connected to A0 of the MQ135 and AO of the KY-026 Flame Sensor.

Buzzer

• PIN is connected to D5 of the ESP8266 NodeMCU.
• GND is connected to GND of the ESP8266 NodeMCU.

DHT11

• DATA is connected to D4 of the ESP8266 NodeMCU.
• VCC is connected to 3V3 of the ESP8266 NodeMCU.
• GND is connected to GND of the ESP8266 NodeMCU.

MQ135

• VCC is connected to 3V3 of the ESP8266 NodeMCU.
• GND is connected to GND of the ESP8266 NodeMCU.
• A0 is connected to A0 of the ESP8266 NodeMCU.

KY-026 Flame Sensor

• AO is connected to A0 of the ESP8266 NodeMCU.
• VCC is connected to 3V3 of the ESP8266 NodeMCU.
• GND is connected to GND of the ESP8266 NodeMCU.

0.96" OLED

• SCK is connected to D1 of the ESP8266 NodeMCU.
• SDA is connected to D2 of the ESP8266 NodeMCU.
• VDD is connected to 3V3 of the ESP8266 NodeMCU.
• GND is connected to GND of the ESP8266 NodeMCU.

Code

No code is provided for this circuit.