http://www.plantower.com/en/content/?107.html

http://aqicn.org/sensor/pms3003/

https://github.com/avaldebe/AQmon/blob/master/Documents/PMS3003_LOGOELE.pdf

    Parameters :Index (Unit )
    Measuring range: 0.3-1.0um ; 1.0-2.5um ; 2.5-10um

Measurement units: ug/m3
3 Measurement accuracy: ug/m3
4 Response time: <10s
5 Work current: 5V200ma@ Work State 5V2ma@ Standby Fitness

    Counting efficiency :50%@0.3um 98% @> = 0.5 um
    Response time :≤ 10 sec
    DC supply voltage :5 V
    Operating current :120 mA
    Standby Current :≤ 200 µA
    Data interface level :L <0.8 @ 3.3 H> 2.7@3.3 V
    Operating temperature range :-20 ~ + 50 °C
    Operating humidity range :0 to 99%
    MTBF :≥ 3 Year
    Size :65 × 42 × 23 mm

pinout

    PIN1 :VCC :Power Supply (5V).
    PIN2 :GND :Ground.
    PIN3 :SET :Standby mode (when 0), operating mode (when 1) TTL 3V3
    PIN4 :RXD :Serial receive / TTL level @ 3.3V.
    PIN5 :TXD :Serial transmit / TTL level @ 3.3V.
    PIN6 :RESET :Module reset / TTL level @ 3.3V.
    PIN7,8 :NC :Not connected.

serial

9600