Using this CO2 Sensor App, you can read an EE895 CO2 sensor connected to the Raspberry Pi using I2C. We (pi3g e.K.) offer a plug & play EE895 CO2 Sensor breakout module, which you can connect directly to the Raspberry Pi header.
Three different measurement values are supported:
- air pressure
- air temperature
- CO2 concentration (in ppm)
The app has three different views, allowing you to visualize the data the way you want:
Installation and Setup
Power your Raspberry Pi off, and connect the EE895 module. Refer to your vendor’s instructions how to do this.
Note: the EE895 also supports UART operation. This app only supports I2C operation, however.
Power your Raspberry Pi back on. By this time, hopefully PiCockpit is already installed. You do not need to install any software besides PiCockpit for this app to work. (You’re welcome :-))
Open the CO2 Sensor app, and click on the Setup button:
Enable the EE895 sensor by clicking on the “enable sensor” toggle.
Note: the EE895 supports only one I2C address for the simple mode which we are using, therefore you will not be able to change it.
If the sensor can be reached, the message below should update to “Data received: …” with a timestamp of the most recent data packet received.
Note: data packets will be sent every second, but the sensor itself (by default) measures ~ every 12 secs. Therefore, data will update gradually – please be patient.
reset all settings
This button will allow you to reset the settings to factory default settings.
Use the “show me” buttons to select the measured value you would like to see.
Use the search to focus on just the values you are interested in:
The elements at the bottom and right next to the chart allow you to drill down into particular data areas and value areas which you are interested in. They are great to zoom into a chart:
Note that the historical data values will only be preserved in your web browser while the app is open. Once you navigate away, or close the tab, the data will be lost.
In the Gauge view, you will get beautiful gauges to display the current values. Here you can monitor the following values:
- air temperature (in °C)
- air pressure (in hPa)
- CO2 concentration (in ppm)
The gauge view also contains a table with the data at the bottom.
For the purists among us, who like their data being presented in tabular fashion, the table view offers just the right fit:
You can use the search feature to narrow down the view to just the items you’re interested in:
Does this app also support the Winsen MH-Z19C? Or the Winsen MH-Z19B?
Where can I obtain the EE895?
We (pi3g) provide an EE895 breakout board which is designed for plug & play attachment on the Raspberry Pi GPIO header. The EE895 has a big advantage: it does not need to be calibrated with fresh air every day / week! It’s a high quality sensor by an Austrian company, E+E Electronics.