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You will also be able to view the calculated distances in real time through the Serial Monitor.
3 LED 3 220 Ohm Resistor 1 Arduino UNO R3 1 Breadboard Connector Wires
Code:
//------------- Code Starts Here ---------------------------- //----------------------------------------- //Published by IntroductionToArduino.com //Created by Paul Illsley (www.paulillsley.com) //Please use and share so others can enjoy //----------------------------------------- // creating variables for the ultrasonic sensor data and assigning them to specific pins int trigger_pin = 8; int echo_pin = 12; // creating variables for distance calculations to be preformed later float duration; float cm; float inches; void setup() { // set up serial monitor at a baud rate of 9600 Serial.begin (9600); // declaring the pin modes as either output or input pinMode(trigger_pin, OUTPUT); pinMode(echo_pin, INPUT); } void loop() { // activating the ultrasonic sensor to collect pulse length data digitalWrite(trigger_pin, LOW); delayMicroseconds(5); digitalWrite(trigger_pin, HIGH); delayMicroseconds(10); digitalWrite(trigger_pin, LOW); // placing the pulse length data in the "duration" variable duration = pulseIn(echo_pin, HIGH); // calculate the distance from the pulse length data cm = (duration/2) / 29.1; inches = (duration/2) / 74; // Sending the raw and calculated distances (cm and inches) to the serial monitor Serial.print("duration(ms):"); Serial.print(duration); Serial.print(", cm:"); Serial.print(cm); Serial.print(", inches:"); Serial.print(inches); Serial.println(); // creating a statement saying: // if the distance (cm) is greater than 30 then turn on pin 11 (LED #1) // if the distance (cm) is greater than 15 and equal to or less than 30 then turn on pin 10 (LED #2) // if the distance (cm) is anything else, turn on pin 9 (LED #3) if(cm > 30.0) { digitalWrite(11,HIGH); digitalWrite(10,LOW); digitalWrite(9,LOW); } else if(cm > 15.0 && cm <= 30) { digitalWrite(11,LOW); digitalWrite(10,HIGH); digitalWrite(9,LOW); } else { digitalWrite(11,LOW); digitalWrite(10,LOW); digitalWrite(9,HIGH); } // delay 500 milliseconds (0.5 seconds) delay(500); } //------------- Code Stops Here ----------------------------
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