WeMos D1 mini with Nova SDS011 air quality sensor and BMP085 barometric sensor

Simple Air Quality measure device based on WeMOS D1 mini and Nova SDS011 air quality sensor

Description

This example shows possible implementation of Air Quality monitring device based on ESP8266 (in this case - WeMos D1 mini) and SDS011 air quality sensor which has reasonable 8000 hours of constant running lifetime (1 year!) which this example extends to 15 - 20 years (because we're using device's sleep capability and running it only for few seconds every 5 minutes) and has reasonable accuracy for reasonable price ($25).

The example assume you're using InfluxDB as your database somewhere in your wifi network and Grafana to display measurement data.

Total estimated price (if you order all the stuff from AliExpress): $21,80 (SDS011) + $3 (WeMos D1 mini) + $1,8 (BMP085) = $26,6.

Pinout connections

Connecting

Known issues

Deep sleep

WeMos - as any other ESP8266 device - gives you ability to enter deep sleep and basically minimize power usage to absolute minimum. However i've come across weird behaviour with SDS011 being constantly on, while ESP8266 was in deep sleep. And because i'd rather keep tear and wear of SDS011 down (rated 8000 hours of constant running) - this example doesn't use deep sleep of ESP at all.

Arduino IDE in favour of MicroPython

I absolutely love MicroPython, however i needed Software Serial support on different pins than UART available through MicroPython (as only available UART is hardware one, which is used while you program your ESP, which renders it obsolete).

License

MIT.

Copyright (c) 2017 Gabor Wnuk.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.