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①
Sensor module - Sampling the environment data, including laser
PM2.5 sensor, Temperature/humidity sensor SHT30, CO2 sensor Senseair-S8,
gravity sensor ADXL345.
②
MCU controlling module – is responsible for all Laser Egg+ CO2
Smart Air Quality Monitor controlling. MARVELL88MW302 processor is used
as the MCU. It is used for data format parsing, PM2.5 concentration
calibration, adjusting the working mode of the Laser Egg+ CO2 Smart Air
Quality Monitor based on the signals from the gravity sensor, and to switch
the displays in the system according to the manual intervention via the
buttons.
③
Display module – includes a LCD screen and the UI buttons. The
screen can display the PM2.5 values in three modes, and also the battery
state including charging and discharging.
④
Communication module – Wi-Fi module. It is used for the remote
communication of Laser Egg+ CO2 Smart Air Quality Monitor. It can upload
the data acquired by the multiple air sensors, and also receive the
commands sent by the user via app on smart phones.
⑤
Power module – including the lithium battery system,
charge/discharge management chip. It is used for the power supply
of the whole system.
2．Sensor introduction:
Laser Egg+ CO2 Smart Air Quality Monitor uses a particle sensor based
on laser scattering.
The sensor contains a laser generator and a photoelectric receiver.
It can convert laser scattering caused by the particles to electrical
signals, which are calculated into particle counting and concentration
with algorithms.
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