Table 1.

Different IoT devices

References	Device name	Purpose	Sensors used	Advantages	Disadvantages
Tamil selvi et al. [7]	Health monitoring device	check minority symptoms of a patient like heart rate, percentage of oxygen saturation, body temperature, and eye movement in IoT	Heartbeat, SpO2, Temperature, and Eye blink sensors	Maintaining costs is less	No proper performance calculations are explained for any patient
Acharya et al. [8]	healthcare monitoring kit	Detecting the health condition of humans like a heartbeat, body temperature, ECG and respiration	Body temperature sensor, ECG, pulse monitor,	Easy to handle	Data vitalization without interfaces is implemented
Banerjee et al. [9]	Pulse rate detection system	Measure the pulse waves in the patient body	Heart rate sensor	Reliable for the people with respect to other methods	The Plethysmography procedure gives less accurate measurements
Trivedi et al. [10]	Microcontroller based health parameter surveillance	Monitor the patient’s health, such as the temperature of the body, rate of heart etc	Heart rate, SPO2, body temperature sensor	Analogue to digital converter makes the performance of the device faster	Less accurate, low efficiency and complex structure
Kumar et al. [11]	Adaptive IoT safety monitoring device	Quantification of the body temperature of the patient and a pulse sensor to calculate the pulse rate	DS18B20	Three-layer architecture improves the performance of the system	Sensors cannot be treated properly