Датчик расстояния

Модуль ультразвукового датчика расстояния (HC-SR04) может измерять расстояния от 2 сантиметров до 5 метров (если вам повезет).

Вы могли бы, например, использовать его для проверки уровня воды в баке или в качестве датчика парковки в вашем гараже.

Он работает методом отправки коротких ультразвуковых звуковых импульсов, которые не слышны человеку, и ждет, пока импульсы вернутся в микрофон. Затем HC-SR04 вычисляет расстояние, измеряя время задержки для каждого импульса.

Подключение

Начните с подключения радиомодуля.

Датчик	Arduino	Коментарии
VCC	VCC	Красный
TRIG	D6	Синий
ECHO	D5	Зелёный
GND	GND	Чёрный

Пример

В этом примере используется внешняя библиотека NewPing, найденная здесь. Пожалуйста, установите его и перезапустите среду разработки Arduino перед тем, как компилировать.

/**
 * The MySensors Arduino library handles the wireless radio link and protocol
 * between your home built sensors/actuators and HA controller of choice.
 * The sensors forms a self healing radio network with optional repeaters. Each
 * repeater and gateway builds a routing tables in EEPROM which keeps track of the
 * network topology allowing messages to be routed to nodes.
 *
 * Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
 * Copyright (C) 2013-2015 Sensnology AB
 * Full contributor list: https://github.com/mysensors/Arduino/graphs/contributors
 *
 * Documentation: http://www.mysensors.org
 * Support Forum: http://forum.mysensors.org
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 *******************************
 *
 * REVISION HISTORY
 * Version 1.0 - Henrik EKblad
 * 
 * DESCRIPTION
 * This sketch provides an example how to implement a distance sensor using HC-SR04 
 * http://www.mysensors.org/build/distance
 */

// Enable debug prints
#define MY_DEBUG

// Enable and select radio type attached
#define MY_RADIO_RF24
//#define MY_RADIO_RFM69

#include <MySensors.h>  
#include <NewPing.h>

#define CHILD_ID 1
#define TRIGGER_PIN  6  // Arduino pin tied to trigger pin on the ultrasonic sensor.
#define ECHO_PIN     5  // Arduino pin tied to echo pin on the ultrasonic sensor.
#define MAX_DISTANCE 300 // Maximum distance we want to ping for (in centimeters). Maximum sensor distance is rated at 400-500cm.
unsigned long SLEEP_TIME = 5000; // Sleep time between reads (in milliseconds)

NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE); // NewPing setup of pins and maximum distance.
MyMessage msg(CHILD_ID, V_DISTANCE);
int lastDist;
bool metric = true;

void setup()  
{ 
  metric = getControllerConfig().isMetric;
}

void presentation() {
  // Send the sketch version information to the gateway and Controller
  sendSketchInfo("Distance Sensor", "1.0");

  // Register all sensors to gw (they will be created as child devices)
  present(CHILD_ID, S_DISTANCE);
}

void loop()      
{     
  int dist = metric?sonar.ping_cm():sonar.ping_in();
  Serial.print("Ping: ");
  Serial.print(dist); // Convert ping time to distance in cm and print result (0 = outside set distance range)
  Serial.println(metric?" cm":" in");

  if (dist != lastDist) {
      send(msg.set(dist));
      lastDist = dist;
  }

  sleep(SLEEP_TIME);
}

/**

* The MySensors Arduino library handles the wireless radio link and protocol

* between your home built sensors/actuators and HA controller of choice.

* The sensors forms a self healing radio network with optional repeaters. Each

* repeater and gateway builds a routing tables in EEPROM which keeps track of the

* network topology allowing messages to be routed to nodes.

* Created by Henrik Ekblad <henrik.ekblad@mysensors.org>

* Full contributor list: https://github.com/mysensors/Arduino/graphs/contributors

* Documentation: http://www.mysensors.org

* Support Forum: http://forum.mysensors.org

* This program is free software; you can redistribute it and/or

* modify it under the terms of the GNU General Public License

* version 2 as published by the Free Software Foundation.

*******************************

* REVISION HISTORY

* Version 1.0 - Henrik EKblad

* DESCRIPTION

* This sketch provides an example how to implement a distance sensor using HC-SR04

* http://www.mysensors.org/build/distance

// Enable debug prints

#define MY_DEBUG

// Enable and select radio type attached

#define MY_RADIO_RF24

//#define MY_RADIO_RFM69

#include <MySensors.h>

#include <NewPing.h>

#define CHILD_ID 1

#define TRIGGER_PIN 6 // Arduino pin tied to trigger pin on the ultrasonic sensor.

#define ECHO_PIN 5 // Arduino pin tied to echo pin on the ultrasonic sensor.

#define MAX_DISTANCE 300 // Maximum distance we want to ping for (in centimeters). Maximum sensor distance is rated at 400-500cm.

unsigned long SLEEP_TIME = 5000; // Sleep time between reads (in milliseconds)

NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE); // NewPing setup of pins and maximum distance.

MyMessage msg(CHILD_ID, V_DISTANCE);

int lastDist;

bool metric = true;

void setup()

{

metric = getControllerConfig().isMetric;

}

void presentation() {

// Send the sketch version information to the gateway and Controller

sendSketchInfo("Distance Sensor", "1.0");

// Register all sensors to gw (they will be created as child devices)

present(CHILD_ID, S_DISTANCE);

}

void loop()

{

int dist = metric?sonar.ping_cm():sonar.ping_in();

Serial.print("Ping: ");

Serial.print(dist); // Convert ping time to distance in cm and print result (0 = outside set distance range)

Serial.println(metric?" cm":" in");

if (dist != lastDist) {

send(msg.set(dist));

lastDist = dist;

}

sleep(SLEEP_TIME);

}

Документация

HC-SR04.pdf