Enhancing Healthcare through Detection and Prevention of COVID-19 Using Internet of Things and Mobile Application

Algorithm 3

Work of an ultrasonic sensor.

	Step 1: start.
	Step 2: [check NodeMCU connection].
	If(connected) {
	Calculate the distance.
	} else {
	NodeMCU connection failed.
	}
	Step 3: [calculating distance].
	Get data from ultrasonic sensor.
	Step 4: check the data with applied conditions.
	Step 5: if (distance > normal) {
	Buzzer = ON.
	Red LED = ON.
	Notify the user and admin.
	} else {
	Green LED = ON.
	}
	Step 6: repeat steps 3 to 7.
	Step 7: end.