This project uses a 2 main sensors to monitor the environment within our print room. The particulate matter(PM2.5 HM3301) sensor, and the BME280 sensor which measure temperature and humidity. We added a blower fan right above the Micro-USB port to circulate air through the enclosure.
The HM-3301 Dust Sensor is based on the advanced Mie scattering theory. When light passes through particles with quantity same as or larger than wavelength of the light, it will produce light scattering. The scattered light is concentrated to a highly sensitive photodiode, which is then amplified and analyzed by a circuit. With specific mathematical model and algorithm, the count concentration and mass concentration of the dust particles is obtained.
This project is being recorded on a visual dashboard where charts show the information in an easy to read format.