http://git.rot13.org/?p=air-quality;a=blob;f=zph02.pl;hb=HEAD
Model ZPH02
Working voltage range 5 +/- 0.2 V (DC)
Output way Rate of low level%(recommending 30s)
Output signal voltage 5 +/- 0.2 V
Detection ability smallest particles 1 μm diameter
Warm-up time
Working current
Storage
Humidity
≤1min(device warming-up time)
≤90mA
≤95%RH
range Working ≤95%RH
Temperature
range Storage
Working -30 deg. C~50 deg. C
0�C~50�C
Size 59.5�44.5�20mm(L�W�H)
Physical interface EH2.54-5P
| PIN No. | PMW mode | UART mode |
| PIN1 | GND | GND |
| PIN2 | NC | TXD |
| PIN3 | VCC | VCC |
| PIN4 | PWM | NC |