https://github.com/alifeee/co2-monitoring

Monitoring CO2 levels, and temperature with an ESP8266 D1 Mini microcontroller and a Sensirion SCD40 CO2 sensor.
https://github.com/alifeee/co2-monitoring

co2 co2-monitor co2-sensor cpp esp8266 scd40 sensirion

Last synced: 24 days ago
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Monitoring CO2 levels, and temperature with an ESP8266 D1 Mini microcontroller and a Sensirion SCD40 CO2 sensor.

• Host: GitHub
• URL: https://github.com/alifeee/co2-monitoring
• Owner: alifeee
• Created: 2024-03-12T01:32:02.000Z (10 months ago)
• Default Branch: main
• Last Pushed: 2024-12-07T18:08:51.000Z (about 1 month ago)
• Last Synced: 2024-12-12T17:48:38.791Z (27 days ago)
• Topics: co2, co2-monitor, co2-sensor, cpp, esp8266, scd40, sensirion
• Language: C++
• Homepage:
• Size: 4.12 MB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 1
• Metadata Files:
  • Readme: README.md

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README

        
# CO2 Monitoring

Monitoring CO2 levels, and temperature with an ESP8266 D1 Mini microcontroller and a Sensirion SCD40 CO2 sensor.

To be connected to a time-series database like [InfluxDB](https://docs.influxdata.com/influxdb/v2/install/)...

![Screenshot of InfluxDB dashboard, showing "1,366 ppm" of CO2, 18.6℃ temperature, and 59.0% humidity.](images/influxdb_dashboard.png)

...or used to manually probe data via the serial monitor...

![screenshot of graph of CO2 over time](images/CO2_plot.png)

## Sensor used

[Sensirion SCD40](https://developer.sensirion.com/products-support/scd4x-co2-sensor/) -> [Sensirion_SCD4x_Datasheet.pdf](./Sensirion_SCD4x_Datasheet.pdf)

## Microcontroller used

[ESP8266 D1 Mini](https://www.wemos.cc/en/latest/d1/d1_mini.html)

## Requirements

[Platform IO](https://platformio.org/) for VSCode. Follow their guide to get started.

## How to build

This is setup to use InfluxDB. First, set up an InfluxDB instance on a server following the [guide](https://docs.influxdata.com/influxdb/v2/install/).

### Secrets file

Project secrets are stored in `./src/secrets.h`. There is an example secrets file [`./src/secrets.example.h`](./src/secrets.example.h).

This contains:

- InfluxDB secrets (URL, organisationm access token, bucket)

- WiFi secrets (SSID, password)

### Build

1. Select correct board (D1 Mini) with Platform IO.

1. Build & upload with Platform IO

1. Connect to COM Port with serial monitor

## Plot data manually

Live-plot example data: use `PuTTY` to create a log file (`putty.log`), and use bash's `watch` to plot the data, e.g., using gnuplot/eplot - [see guide](https://gist.github.com/alifeee/2e1ea8ad5290a553316e715f658f1fd7).