This video tutorial shows you how to use Tinkercad Circuits and Blockly@rduino to program an Arduino to read values from an ultrasonic distance sensor.

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Distance Sensor Lab: http://bit.ly/distanceLab
Blocky@rduino: http://bit.ly/Blocklyrduino
Tinkercad: https://www.tinkercad.com/

Since I cannot find a ultrasonic distance sensor block on Blockly@rduino, I used the code below instead:

int distance;

long readUltrasonicDistance(int triggerPin, int echoPin)
{
pinMode(triggerPin, OUTPUT);
digitalWrite(triggerPin, LOW);
delayMicroseconds(2);
digitalWrite(triggerPin, HIGH);
delayMicroseconds(10);
digitalWrite(triggerPin, LOW);
pinMode(echoPin, INPUT);
return pulseIn(echoPin, HIGH);
}

Use the following line of code within the void loop() section of your code to read the distance in centimeters:
distance = 0.01723 * readUltrasonicDistance(2, 3);