diff --git a/src/demoreadersettings.cpp b/src/demoreadersettings.cpp
new file mode 100644
--- /dev/null
+++ b/src/demoreadersettings.cpp
@@ -0,0 +1,51 @@
+/*
+  Copyright © 2018 Hasan Yavuz Özderya
+
+  This file is part of serialplot.
+
+  serialplot is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  serialplot is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with serialplot.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "demoreadersettings.h"
+#include "ui_demoreadersettings.h"
+
+#include "utils.h"
+
+DemoReaderSettings::DemoReaderSettings(QWidget *parent) :
+    QWidget(parent),
+    ui(new Ui::DemoReaderSettings)
+{
+    ui->setupUi(this);
+
+    connect(ui->spNumChannels, SELECT<int>::OVERLOAD_OF(&QSpinBox::valueChanged),
+            [this](int value)
+            {
+                emit numChannelsChanged(value);
+            });
+}
+
+DemoReaderSettings::~DemoReaderSettings()
+{
+    delete ui;
+}
+
+unsigned DemoReaderSettings::numChannels() const
+{
+    return ui->spNumChannels->value();
+}
+
+void DemoReaderSettings::setNumChannels(unsigned value)
+{
+    ui->spNumChannels->setValue(value);
+}