Third part of the DIY SMOG sensor - adding relay,

[Lukasz_C_Jokiel (Łukasz C. Jokiel)]

Third part of the DIY SMOG sensor - adding relay, data upload to Domoticz and Grafana visualization: https://blog.jokielowie.com/en/2017/11/esp8266-i-smog-czesc-trzecia-ochrona-czujnika-wysylanie-danych-do-wlasnej-chmury/