用Tinkercad学arduino之 超声波测距LED警告
作者:互联网
项目地址:https://www.tinkercad.com/things/j0k4YgzXoDF-ultrasonic-distance-sensor-led-bar-graph-blocks
int distanceThreshold = 0; int cm = 0; int inches = 0; long readUltrasonicDistance(int triggerPin, int echoPin) { pinMode(triggerPin, OUTPUT); // Clear the trigger digitalWrite(triggerPin, LOW); delayMicroseconds(2); // Sets the trigger pin to HIGH state for 10 microseconds digitalWrite(triggerPin, HIGH); delayMicroseconds(10); digitalWrite(triggerPin, LOW); pinMode(echoPin, INPUT); // Reads the echo pin, and returns the sound wave travel time in microseconds return pulseIn(echoPin, HIGH); } void setup() { Serial.begin(9600); pinMode(2, OUTPUT); pinMode(3, OUTPUT); pinMode(4, OUTPUT); } void loop() { // set threshold distance to activate LEDs distanceThreshold = 350; // measure the ping time in cm cm = 0.01723 * readUltrasonicDistance(7, 7); // convert to inches by dividing by 2.54 inches = (cm / 2.54); Serial.print(cm); Serial.print("cm, "); Serial.print(inches); Serial.println("in"); if (cm > distanceThreshold) { digitalWrite(2, LOW); digitalWrite(3, LOW); digitalWrite(4, LOW); } if (cm <= distanceThreshold && cm > distanceThreshold - 100) { digitalWrite(2, HIGH); digitalWrite(3, LOW); digitalWrite(4, LOW); } if (cm <= distanceThreshold - 100 && cm > distanceThreshold - 250) { digitalWrite(2, HIGH); digitalWrite(3, HIGH); digitalWrite(4, LOW); } if (cm <= distanceThreshold - 250 && cm > distanceThreshold - 350) { digitalWrite(2, HIGH); digitalWrite(3, HIGH); digitalWrite(4, HIGH); } if (cm <= distanceThreshold - 350) { digitalWrite(2, HIGH); digitalWrite(3, HIGH); digitalWrite(4, HIGH); } delay(100); // Wait for 100 millisecond(s) }
标签:triggerPin,LED,cm,arduino,digitalWrite,HIGH,Tinkercad,distanceThreshold,LOW 来源: https://www.cnblogs.com/meetrice/p/14083015.html