This project introduces us to the HC-SR04 Ultrasonic Sensor. We will be creating an alarm circuit with a buzzer and warning LEDs. You will understand how an ultrasonic sensor works and how to interact with it in code. This is a very handy addition to your electronics projects for obstacle avoidance.

Learning Objectives:

• How an ultrasonic sensor (HC-SR04) works
• The pinouts and how to connect an ultrasonic sensor in a circuit
• How the pulseIn() function works

pulseIn() function

Ultrasonic_Sensor_Code