我正在研究 arduino 和 HC_SR04。我搜索了大部分文档，但它们并没有解决我们的问题。
我的问题是如何读取从 library 获取的值<NewPing>。
#define echopin 11 //set echopin
#define trigpin 12 //set trigpin
#include <Servo.h>;
Servo robotArm;
#include <NewPing.h>
#define MAX_DISTANCE 400
NewPing sonar(trigpin, echopin, MAX_DISTANCE);
int distance;
void setup() {
// put your setup code here, to run once:
Serial.begin(9600);
robotArm.attach(9); //attach our servo
robotArm.writeMicroseconds(150);
}
void loop() {
// put your main code here, to run repeatedly:
robotArm.write(90); //always set to servo 90 to position it to the middle
//codes of ultrasonic sensor
distance=digitalRead(echopin);
if (distance <= 20) //if ultrasonic sensor detects on obstacle less than 20 cm in 90 degree angle
{
robotArm.write(0); //dervo rotates at full speed to the right
delay(60);
}
else
{
robotArm.write(90); //else servo stays at 90 degree angle
delay(60);
}
Serial.print(distance); //print distance
Serial.println("cm"); //print distance unit cm
}