CO2 air quality monitor with Line notification V2

Introduction

This is an updated version of previous project IoT Laboratory: CO2 air quality monitor with Line notification.

Why?

After cold start, it takes about 65 seconds for MH_Z19B to preheat itself. During this period, the reading will be somewhere between 410 and 430, but, it should not be considered as an actual measurement. Once preheating period has finished, it starts showing actual CO2 density. Therefore, it is recommended to read sensor after 65 seconds at least. For your reference, according to the manual, preheating time is 3 minutes.

What's changed

- Display current status: Preheating, Measuring
- Add line chart on web interface

Source code

References

- IoT Laboratory: ESP8266-based WiFi air quality monitoring system using PMS7003 sensor with Google Chart visualization
- IoT Laboratory: ESP8266-based WiFi air quality monitoring system using PMS7003 sensor

- IoT Laboratory: ESP8266-based air quality monitoring system using PMS7003 sensor
- IoT Laboratory: ESP8266-based WiFi MQTT air quality monitoring system using PMS7003 sensor

- MH-Z19B Manual PDF: mh-z19b-co2-ver1_0.pdf

- Arduino WiFiClient
- EPS8266 Sketch Data Upload
- ESPAsyncTCP Library
- ESPAsyncWebServer Library
- Google Chart : Gauge
- LINE Notify
- Using LINE Notify to send messages to LINE from the command-line - LINE ENGINEERING

Source codes at github