Arduino uno & lcd keyapd shield Cover for PPD42NS and DHT22

▶The PPD42NS Air Quality Sensor

This optical dust sensor can measure the air quality by measuring on air particles/dust.

* Grove compatible interface(extra wire with connecter)
* Supply voltage range: 5V
* Minimum detect particle: 1um
* Detecting particles range: 8000pcs / 283ml
* PWM output
* Dimensions: 59(W)x45(H)x22(D) [mm]

https://www.mouser.com/ds/2/744/Seeed_101020012-1217636.pdf
http://irq5.io/2013/07/24/testing-the-shinyei-ppd42ns/

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