copy everything under www/ to root folder of your webserver (php has to be enabled), default for raspberry /var/www/html/

there is no security settings to make it easier to read and understand

start page for browser access loads a gauge and history diagramm (google charts)

data for it will be loaded as json

data will be read from data access files described below

start python readdata.py

this uses a lib mq.py which is form:

adapted from http://sandboxelectronics.com/?p=165

adapted form https://github.com/tutRPi/Raspberry-Pi-Gas-Sensor-MQ

this will read the start value from ADC and set this as "fresh air" value

this will write data (see file for more details) every 0.5 sec to

smbus_A0.current
smbus_A0.ppb
smbus_A0.ugpm3
smbus_A0.csv

and to the console

since most board do not come with a datasheet/description this is what i used:

data sheet for the heart piece: https://aqicn.org/air/view/sensor/spec/o3.winsen-mq131.pdf

    VCC
     |
    +++
    | | RS
    +++
     |
     +------- AOUTDC
     |
    +++
    | | RL (My board used 1kOhm)
    +++
     O
     |
    GND

if you have questions or ideas: [email protected]