Table 1.

Hardware type and specifications of WSN Environmental Sensor Nodes.

Hardware Type	Hardware Specifications
Processor (MSP430F1611)	Data Bus Width: 16 bit
	Program Memory Size: 48 KB
	Data RAM Size: 10 KB
	Maximum Clock Frequency: 8 MHz
	On-Chip ADC: 8-chx12-bit
	On-Chip DAC: 2-chx12-bit
	Number of Programmable I/Os: 48
	Interface Type: USART
	Operating Supply Voltage: 1.8 V to 3.6 V
	Maximum Operating Temperature: 85 °C
	Minimum Operating Temperature: −40 °C
RF Device (CC2420)	Radio Frequency (Mhz): 2,400
	Max. Data Rate (kbits/sec): 250
	Antenna: PCB Antenna or SMA
Temperature Humidity Sensor (SHT-71)	Vmax (VDD): 2.4–5.5
	Humidity range: 0–100%
	RH Humidity Accuracy: ±3% RH (20–80% RH)
	Repeatability: ±0.1% RH
	Temperature Accuracy: ±0.4 °C @ 25 °C
Luminance Sensor (GL5547)	Vmax (VDC): 150
	Pmax (mW): 100
	Ambient Temp (°C): −30∼+70
	Spectral Peak (nm): 540
	Response Time (ms): Rise 20, Decay 30