This project has been developed as sem 6 sensor lab project.
The sensors used are MQ135 Gas sensor, LM393 Sound Sensor along with Arduino Uno as a Microcontroller. Now to feed the data to the internet we have used NodeMCU Board. Note: We first went on with ESP8266 wifi module but connecting it is a very difficult task and also it doesn't work well so please go for a NodeMCU Board.
Now coming towards the connection part, I will upload the circuit diagram to help out new learners or other people who want to make similar things.
The libraries used externally are (all the external libraries will be added in the code section):
- MQ135 Master to get ppm values fro ch4, co3 and nh3.
- Esp8266 Library along with board controller has been used.
- A special library called ArduinoJson.h has been used to convert the ppm values into a json file so that it can be passed easily to the NodeMCU.
- Blynk App has been used to display the pollution value in realtime.
Problems one might face:
- Not able to connect to wifi using esp8266 - solution: switch to NodeMCU.
- Blynk App not working: Once you go to the login page you will see a small signal like icon click on it and enter port as 9443 and host address as: 49.229.108.138