This is possible because we know the sound’s velocity in the air.Įxpressed in cm per micro second = 0.0343 cm/µs.The time between the transmission and reception of the signal allows us to calculate the distance to an object.The transmitter (echo pin) receives it.When the signal finds an object, it is reflected.The transmitter (trig pin) sends a signal: a high-frequency sound.The ultrasonic sensor uses sonar to determine the distance to an object. Considering the travel time and the speed of the sound is 343m/s the object distance from the sensor can be calculated. The HC-SR04 device emits an ultrasound at 40kHz which travels through the air and if there is an object or obstacle on its path, the sound will bounce back to the module.
Light the RED LED if the object is less than 70cm away from the sensor and sound the buzzer.Light the YELLOW LED if the object is between 70cm and 100cm away from sensor.Light the GREEN LED if the object is greater than 100cm away from sensor.We will use Green, Yellow, Red leds and buzzer to signal distance of object as follows: This project will use an ultrasonic sensor to detect motion and light different leds and sound a buzzer depending on the distance of an object from the sensor: The following components are required for this project This project will use an ultrasonic range sensor as a proximity meter.
0 kommentar(er)
