D9 is a digital universal particle sensor based on the principle of laser scattering, which can continuously collect and calculate the number of suspended particles of different sizes in the air per unit volume, and then convert it into mass concentration, and output it in the form of a universal digital interface.

Main characteristics
Laser scattering principle achieves precise measurement
Zero error alarm rate
Real time response and support for continuous acquisition
MIN resolution particle size 0.3 μ M
New patented structure, six sided all-round shielding, stronger anti-interference performance
Ultra thin design, only 12 millimeters, suitable for portable devices

PIN1 VCC power supply 5V
PIN2 GND power supply ground
PIN3 NC NC
PIN4 RXD serial port receiving pin (3 3V level)
PIN5 TXD serial port sending pin (3 3V level)
PIN6 RESET is suspended during use. Connecting low will cause the module to malfunction.
PIN7 NC NC
PIN8 PWM PWM pulse width signal output pin (3 3V level)

Measurement range: 0.3-10 μ m micrometers
Effective range of particulate matter mass concentration: 700 μ g/m3 microgram/cubic meter
Particle concentration in MAX range: ≥ 1000 μ g/m3 micrograms/cubic meter
Resolution of particulate matter mass concentration: 1 μ g/m3 microgram/cubic meter
Accurate volume: 0.1 L liters
Particle quantity range: 0-65535/0 IL
DC power supply voltage: 4.90-5.10 V volts
Interface voltage level: 2.7-3.6 V volts
MAX working current: 70 mA milliampere
Response time: 1 second
Working temperature: -10-60 ° C Celsius
Storage temperature: -30-80 ° C Celsius
Working humidity (non condensing): 40% -80% RH
Storage humidity (non condensing): 0% -95% RH
Consistency of particulate matter mass concentration: ± 10% μ g/m3 microgram/cubic meter (≥ 100 ug/m3)
Product lifespan: ≥ 3 years
MAX size: 48X40X12 millimeters (mm)