1. 概述
本传感器主要用于测距，它具有高精度、盲区（2cm）超近、性能稳定的特点。传感器自带4个定位孔，方便你将传感器固定在其他设备。
2. 规格参数
工作电压：5V（DC）
工作电流：15mA
工作频率：40khz
最大探测距离：3-5m
最小探测距离：2cm
感应角度：不大于15度
高精度：可达3mm
3. 连接图
4. 测试代码
#define echoPin 7 // Echo Pin
#define trigPin 8 // Trigger Pin
#define LEDPin 13 // Onboard LED
int maximumRange = 200; // Maximum range needed
int minimumRange = 0; // Minimum range needed
long duration, distance; // Duration used to calculate distance
void setup() {
Serial.begin (9600);
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
pinMode(LEDPin, OUTPUT); // Use LED indicator (if required)
}
void loop() {
/* The following trigPin/echoPin cycle is used to determine the
distance of the nearest object by bouncing soundwaves off of it. */
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
//Calculate the distance (in cm) based on the speed of sound.
distance = duration/58.2;
if (distance >= maximumRange || distance <= minimumRange){
/* Send a negative number to computer and Turn LED ON
to indicate “out of range” */
Serial.println(“-1”);
digitalWrite(LEDPin, HIGH);
}
else {
/* Send the distance to the computer using Serial protocol, and
turn LED OFF to indicate successful reading. */
Serial.println(distance);
digitalWrite(LEDPin, LOW);
}
//Delay 50ms before next reading.
delay(50);
}
5. 测试结果
按照上图接好线，烧录好代码，上电后，打开串口监视器，即可看到超声波传感器和前方障碍物之间的距离，单位为cm，显示如下图。
