Make sure the baud rate is also set to 9600 in the serial monitor. Later you will display the measured distance in the serial monitor, which can be accessed with Ctrl+Shift+M or Tools > Serial Monitor. Next you initialize serial communication at a baud rate of 9600. In the setup(), you start by setting the trigPin as an output and the echoPin as an input. The distance variable is used to store the calculated distance. Duration stores the time between sending and receiving the sound waves.
Next I defined two variables: duration and distance. So everywhere you mention trigPin, the compiler will replace it with the value 2 when the program is compiled. The compiler will replace any references to this constant with the defined value when the program is compiled. The statement #define is used to give a name to a constant value. The trigger pin is connected to digital pin 2 and the echo pin to digital pin 3 on the Arduino. Print the distance on the Serial Monitor (Ctrl+Shift+M):įirst, the trigger pin and the echo pin are defined. Read the echoPin, pulseIn() returns the duration (length of the pulse) in microseconds: Trigger the sensor by setting the trigPin high for 10 microseconds: Begin Serial communication at a baudrate of 9600: * Example code for HC-SR04 ultrasonic distance sensor with Arduino. By measuring how much time passed between sending and receiving the sound waves, the distance between the sensor and the object can be calculated. If there is an object in front of the sensor, the sound waves get reflected back and the receiver of the ultrasonic sensor detects them. These sound waves travel through the air with the speed of sound, roughly 343 m/s. Ultrasonic sensors work by emitting sound waves with a frequency that is too high for a human to hear. How does an ultrasonic distance sensor work? is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to products on.
MaxBotix MB1240 ultrasonic distance sensor Arduino tutorial.MaxBotix MB7389 weather-resistant distance sensor tutorial.How to use a SHARP GP2Y0A710K0F IR Distance Sensor with Arduino.How to use a SHARP GP2Y0A21YK0F IR Distance Sensor with Arduino.Waterproof JSN-SR04T Ultrasonic Distance Sensor with Arduino Tutorial.In that case, the articles below might be useful: Cheap ultrasonic distance/proximity sensors are great but in some projects, you might need a waterproof sensor like the JSN-SR04T or an IR sensor that isn’t influenced by temperature changes.
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