Research and Design of Distributed IoT Water Environment Monitoring System Based on LoRa

Table 2

Node monitoring results on November 8, 2019 (clear weather).

Monitoring time	Water quality parameter	Standard value	Node actual value	Relative error (%)
00 : 00	Water temperature (°C)	17.85	17.83	-0.11
	pH	8.31	8.32	0.12
	Conductivity (mS/cm)	0.34	0.33	-2.94
	Turbidity (NTU)	26.5	26.4	-0.38
08 : 00	Water temperature (°C)	18.90	18.94	+0.21
	pH	7.88	7.86	-0.25
	Conductivity (mS/cm)	0.35	0.36	+2.86
	Turbidity (NTU)	26.6	26.6	0
16 : 00	Water temperature (°C)	18.78	18.81	+0.15
	pH	8.33	8.41	+0.96
	Conductivity (mS/cm)	0.33	0.35	+6.06
	Turbidity (NTU)	26.9	27.1	+0.74