9.12 Example: SonarRangerDisplay
/* sonarRangerDisplay This script uses the Velleman VMA 306 SONAR to determine the distance to an objectThe round-trip distance is displayed on the serial plotter. Be sure to turn on the serial monitor from the Arduino IDE. */ #define VCC 2 #define TRIG 3 #define ECHO 4 #define GND 5 long distance, duration; void setup(){ Serial.begin(9600); pinMode(VCC, OUTPUT); pinMode(TRIG, OUTPUT); pinMode(ECHO, INPUT); pinMode(GND, OUTPUT); digitalWrite(VCC, HIGH); digitalWrite(GND, LOW); } void loop(){ // send 10 uSec pulse to TRIG digitalWrite(TRIG, LOW); digitalWrite(TRIG, HIGH); delayMicroseconds(10); digitalWrite(TRIG, LOW); // read the echo delay duration=pulseIn(ECHO, HIGH); distance=duration * 0.017; Serial.print(25); // These 4 lines will keep the Serial.print(" "); // serial plotter scale between Serial.print(0);// 0 and 25 provided that the Serial.print(" ");// object distance/2.54 is less than 25 Serial.println(distance/2.54); }