Introduction: How to Make a LoT Smoke/Alcohol Detectors & Fire Alarms With NodeMCU ESP8266 Blynk DHT11, MQ-2, MQ-3
More details you can watch my Youtube Video.
Step 1: Parts List
The MQ-2 Gas sensor is suitable for detecting H2, LPG, CH4, CO, Alcohol, Smoke or Propane.
The MQ-3 Gas sensor is suitable for detecting Alcohol, Benzine, CH4, Hexane, LPG, CO.
Due to its high sensitivity and fast response time, measurement can be taken as soon as possible. The sensitivity of the sensor can be adjusted by potentiometer.
This project requires the following parts, otherwise it will not show the effect of this project
MQ-2/MQ-3 smoke sensor https://amzn.to/3agaHZ2
DHT11 Temperature & Humidity sensor https://amzn.to/2FhCAVh
20X4 I2C LCD https://amzn.to/3gTMZnW
Jumper wires https://amzn.to/3jCHhZd
Red Led https://amzn.to/3g1v5za
Green Led https://amzn.to/3g1v5za
Step 2: Circuit Diagram
Step 3: Blynk Setting
Download the mobile app named blynk, create a new project, and customize the project name. Select NodeMCU, CONNECTION TYPE -Wi-Fi in CHOOSE DEVICE, and click Create.
Step 4: Arduino Setting
1. Open File-Preferences, enter http://arduino.esp8266.com/stable/package_esp8266c...
in the input box of additional Boards Manger URLs, and click "OK".
2. Install the development board: Open Tools-Board-Board Manager. Enter ESP8266 in the search box of Board Manager and install it.