Initial import

.gitignore

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+build*/
+*.user

source/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.6)
+project(qEcho)
+
+set(CMAKE_INCLUDE_CURRENT_DIR ON)
+
+find_package(Qt5Widgets)
+
+set(CMAKE_AUTOMOC ON)
+set(CMAKE_AUTOUIC ON)
+
+add_executable(${PROJECT_NAME}
+    main.cpp
+    mainwindow.cpp
+    mainwindow.h
+    mainwindow.ui
+    blinkthread.cpp
+    blinkthread.h
+    distancethread.cpp
+    distancethread.h
+)
+
+target_link_libraries(${PROJECT_NAME} wiringPi Qt5::Widgets)
+

source/blinkthread.cpp

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+#include "blinkthread.h"
+#include <wiringPi.h>
+
+BlinkThread::BlinkThread()
+{
+    wiringPiSetup();
+    pinMode(m_blinkPin, OUTPUT);
+}
+
+void BlinkThread::run()
+{
+    while (true)
+    {
+        digitalWrite(m_blinkPin, HIGH);
+        emit ledOn();
+        delay(500);
+
+        digitalWrite(m_blinkPin, LOW);
+        emit ledOff();
+        delay(500);
+    }
+}

source/blinkthread.h

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+#pragma once
+
+#include <QThread>
+
+class BlinkThread : public QThread
+{
+    Q_OBJECT
+
+private:
+    const int m_blinkPin = 15;
+
+public:
+    BlinkThread();
+
+protected:
+    void run() override;
+
+signals:
+    void ledOn();
+    void ledOff();
+};
+

source/distancethread.cpp

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+#include "distancethread.h"
+#include <wiringPi.h>
+
+volatile unsigned int timestampHigh = 0;
+volatile unsigned int timestampLow = 0;
+
+DistanceThread::DistanceThread()
+{
+    wiringPiSetup();
+    pinMode(m_triggerPin, OUTPUT);
+    pinMode(m_echoPin, INPUT);
+}
+
+void DistanceThread::run()
+{
+    wiringPiISR(m_echoPin, INT_EDGE_BOTH, []
+    {
+        if (digitalRead(29) == HIGH)
+        {
+            timestampHigh = micros();
+        }
+        else
+        {
+            timestampLow = micros();
+        }
+    });
+
+    while (true)
+    {
+        digitalWrite(m_triggerPin, HIGH);
+        delayMicroseconds(10);
+        digitalWrite(m_triggerPin, LOW);
+        delayMicroseconds(40);
+
+        unsigned int delayUS = timestampLow - timestampHigh;
+        if (delayUS < 25e3)
+        {
+            emit distanceUpdated(delayUS / 0.58);
+        }
+
+        delay(100);
+    }
+}

source/distancethread.h

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+#pragma once
+
+#include <QThread>
+
+class DistanceThread : public QThread
+{
+    Q_OBJECT
+
+private:
+    const int m_triggerPin = 28;
+    const int m_echoPin = 29;
+
+public:
+    DistanceThread();
+
+protected:
+    void run() override;
+
+signals:
+    void distanceUpdated(double distMeters);
+};
+

source/main.cpp

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+#include "mainwindow.h"
+#include <QApplication>
+#include <iostream>
+
+int main(int argc, char **argv)
+{
+	std::cout << "qEcho" << std::endl;
+
+    QApplication a(argc, argv);
+    MainWindow w;
+    w.show();
+
+    return a.exec();
+}
+

source/mainwindow.cpp

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+#include "mainwindow.h"
+#include "ui_mainwindow.h"
+
+#include "blinkthread.h"
+#include "distancethread.h"
+
+MainWindow::MainWindow(QWidget *parent) :
+    QMainWindow(parent),
+    ui(new Ui::MainWindow)
+{
+    ui->setupUi(this);
+
+    ui->progressBar->setRange(0, 300);
+    ui->progressBar->setFormat("%v cm");
+    ui->progressBar->setValue(0);
+
+    BlinkThread *blinkThread = new BlinkThread();
+    connect(blinkThread, &BlinkThread::ledOn, this, &MainWindow::ledOn);
+    connect(blinkThread, &BlinkThread::ledOff, this, &MainWindow::ledOff);
+    blinkThread->start();
+
+    DistanceThread *distanceThread = new DistanceThread();
+    connect(distanceThread, &DistanceThread::distanceUpdated, this, &MainWindow::distanceUpdated);
+    distanceThread->start();
+}
+
+MainWindow::~MainWindow()
+{
+    delete ui;
+}
+
+void MainWindow::ledOn()
+{
+    ui->label->setText("On");
+}
+
+void MainWindow::ledOff()
+{
+    ui->label->setText("Off");
+}
+
+void MainWindow::distanceUpdated(double distMeters)
+{
+    ui->progressBar->setValue(distMeters / 100);
+}

source/mainwindow.h

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+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QMainWindow>
+
+namespace Ui {
+class MainWindow;
+}
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    explicit MainWindow(QWidget *parent = 0);
+    ~MainWindow();
+
+private:
+    Ui::MainWindow *ui;
+
+private slots:
+    void ledOn();
+    void ledOff();
+    void distanceUpdated(double distMeters);
+};
+
+#endif // MAINWINDOW_H

source/mainwindow.ui

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+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>MainWindow</class>
+ <widget class="QMainWindow" name="MainWindow">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>359</width>
+    <height>189</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>qEcho</string>
+  </property>
+  <widget class="QWidget" name="centralwidget">
+   <layout class="QVBoxLayout" name="verticalLayout">
+    <item>
+     <widget class="QProgressBar" name="progressBar">
+      <property name="value">
+       <number>24</number>
+      </property>
+     </widget>
+    </item>
+    <item>
+     <widget class="QLabel" name="label">
+      <property name="text">
+       <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;&lt;br/&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+      </property>
+     </widget>
+    </item>
+   </layout>
+  </widget>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>