Arduino + HC SR04超声波+电位器

Question

我正在使用Arduino Uno + HC SR04超声波距离传感器，我想添加一个电位计来手动设置最小/最大距离。到目前为止，我已经能够测量距离（例如，移动物体更近/更远），但没有设置最大值或最小值。通过这个电位计，我想在值达到最小值或最大值时停止程序。不幸的是，我不知道如何把它放在代码中，所以任何帮助都将非常感激。对于任何参考，这是我的工作代码到目前为止没有安装电位器。

void setup()
{
    pinMode (2, OUTPUT);
    pinMode (5, OUTPUT);

    Serial.begin(9600);
}

void loop()
{
    digitalWrite(2, HIGH);
    long duration, cm;

    pinMode(3, OUTPUT);
    digitalWrite(3, LOW);
    delayMicroseconds(2);
    digitalWrite(3, HIGH);
    delayMicroseconds(3);
    digitalWrite(3, LOW);

    pinMode(4, INPUT);
    duration = pulseIn(4, HIGH);

    cm = microsecondsToCentimeters(duration);

    Serial.print(cm);
    Serial.println(" cm");

    delay(150);
}

long microsecondsToCentimeters(long microseconds)
{
    return microseconds / 29 / 2;
}

Answer 1

我真的不明白你的意思：

“我想停止距离传感器测量，例如传感器没有检测到5cm内的任何物体（5cm是通过电位器设定的最小值）”

然后向左打开以放置所需的功能

PS：对不起，我有一些个人问题

// http://www.parsicitalia.it/files/HC-SR04-Datasheet.pdf
// HC-SR04
// Sentry Angle : max 15 degree
// Sentry Distance : 2cm - 500cm
// High-accuracy : 0.3cm
// Input trigger signal : 10us TTL impulse
// Echo signal : output TTL PWL signal
// Size : 45*20*15mm

int _trigPin = 11;    //Trig - green Jumper
int _echoPin = 12;    //Echo - yellow Jumper
int _sensorMaxRng = 500; //cm
int _sensorMinRng = 2; //cm

int _potentiometer = 9; // Potentiometer - Analog Pin
int _val = 0;
int _borderLineVal = 0;

long _duration, _cm, _inches, _potentioRng;

void setup() {
    Serial.begin(9600);

    pinMode(trigPin, OUTPUT);
    pinMode(echoPin, INPUT);
}

void loop()
{
    cleanRefreshSensor();

    _val = analogRead(_potentiometer); //reading the Potentiometer value interval: 0 - 1023
    _potentioRng = (long)((_sensorMaxRng - _sensorMinRng) / 1023);
    Serial.println(_val);
    Serial.println(_potentioRng);

    pinMode(_echoPin, INPUT);
    _duration = pulseIn(_echoPin, HIGH); // duration is the time (in microseconds) from the sending of the ping to the reception of its echo off of an object

    // convert the time into a distance
    // The speed of sound is "340 m/s" or "29 microseconds/centimeter"
    _cm = _duration / 2 / 29.1; //Calculate the distance based on the speed of sound divided by 2 ( signal going and coming back)
    _inches = _duration / 2 / 74;

    Serial.print(_inches);
    Serial.print(" in, ");
    Serial.print(_cm);
    Serial.print(" cm");
    Serial.println();

    if(_cm > _potentioRng){
        Serial.print(" IN ");
    }
    else
    {
        Serial.print(" OUT ");
    }

    delay(150);
}

// The sensor is triggered by a HIGH pulse of 10 or more microseconds
// Give a short LOW pulse beforehand to ensure a clean HIGH pulse:
void cleanRefreshSensor()
{
    digitalWrite(_trigPin, LOW);
    delayMicroseconds(5);
    digitalWrite(_trigPin, HIGH);
    delayMicroseconds(10);
    digitalWrite(_trigPin, LOW);
}