# Comfort zone environmental sensor [closed]

Humans need a very specific set of environmental conditions for their wellbeing, mainly temperature, humidity and illumination.

I would like to create a device that can tell how comfortable a certain room is, using temperature and humidity values. With an arduino mini and a DHT22 sensor the device should determine if temperature and humidity are okay or, for instance, the area is too warm (>30°C) or too dry (<10%). The final output should be in a scale from 0 to 10, 0 lowest score and 10 highest.

Now, as the best environmental conditions for humans are 50-60% hum and 22-25°C temp, I need to find a way to perform a basic sensor fusion and combine humidity and temperature values accordingly. I thought of using two Gaussian distributions centered on the two best values (25°C at 60% hum). The t and h values are then fed into the two distributions and the derived y values summed up. Finally, using the map function the final value is remapped into a scale from 0 to 9.

Do you think it will work? Is there an easier solution?
Thank you

## closed as too broad by Juraj, VE7JRO, sempaiscuba, gre_gor, Majenko♦Jan 10 at 13:12

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• looks like something that would work for you – Jaromanda X Jan 10 at 10:06
• interesting project .... notes: include the person's sleep cycle in your device and increase the comfort temperature range .... for instance, for myself 22°C is too warm during the day and <16°C is the right temperature during sleep ..... put "how I feel" buttons on the device, so that the device can learn a person's preference – jsotola Jan 10 at 15:48
• Take a look at the formulas given by ISO 7730: Ergonomics of the thermal environment — Analytical determination and interpretation of thermal comfort using calculation of the PMV and PPD indices and local thermal comfort criteria – Edgar Bonet Jan 11 at 10:44