Table 2.
The power consumption of each sensor and wireless sensor node (powered by energy harvesting).
| Item | Type | Measurement range | Power supply | |
|---|---|---|---|---|
| Temperature sensor | LM355 | −55 °C ∼ +150 °C | 300 μA at 3 V | |
| Relative humidity sensor | SHT1X | 20% ∼ 80% | 550 μA at 3 V | |
| Photosensor with signal processing circuits | Accuracy level was ±2% of the reading range, which yielded 1.5 to 4.5 °C uncertainty. | 1 mA at 2.5 V | ||
| MEMS flow sensor developed by this lab | 0.1 ms−1 ∼ 0.45 ms−1 | 5 mA at 2.5 V | ||
| Signal processor and RF transmission module | PIC16F526 | 0.5 ∼ 10 mA at 3.5 V | Nominal power: 20 mW Standby power: 1.75 mW Transient power max: 35 mW |
|
| Photovoltaic cell | SC 7035 | |||