Table 2.
Sensor specifications of the prototype.
| Sensor | Product | Company | Size (mm) | Range | Accuracy | Power | Type |
|---|---|---|---|---|---|---|---|
| CO | MiCS-5521 | Micro-Chemical Systems | 9.5 × 9.5 × 3.9 | 10 – 1,000 ppm | - | 35 mA/3 V | Heating semiconductor |
| NO2 | MiCS-2710 | Micro-Chemical Systems | 9.5 × 9.5 × 3.9 | 0.05 – 5 ppm | - | 20 mA/3 V | Heating semiconductor |
| VOC | MiCS-5135 | Micro-Chemical Systems | 9.5 × 9.5 × 3.9 | 10 – 1,000 ppm | - | 24 mA/3 V | Heating semiconductor |
| PM | PPD4NS | SHINYEI | 69 × 46 × 22 | 8,000/28 Mℓ | 1 μm | 90 mA/5 V | LED |
| CO2 | D-120 | - | 55 × 51 × 25 | 0 – 2,000 ppm | ±5.0% | 50 mA/12 V | NDIR |
| Temperature | SHT11 | Sensirion | 4.88 × 7.24 × 2.5 | -40 – 123.8 °C | ±0.4 @25 °C | 4 mA/3 V | CMOSens |