diff --git a/src/ledwidget.cpp b/src/ledwidget.cpp
new file mode 100644
--- /dev/null
+++ b/src/ledwidget.cpp
@@ -0,0 +1,129 @@
+/*
+  Copyright © 2018 Hasan Yavuz Özderya
+
+  This file is part of serialplot.
+
+  ledwidget 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.
+
+  ledwidget 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 ledwidget.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "ledwidget.h"
+#include <QPainter>
+#include <QPainterPath>
+#include <QRadialGradient>
+
+LedWidget::LedWidget(QWidget* parent) : QWidget(parent),
+    m_color(107,223,51),
+    m_on(true)
+{
+    resize(20,20);
+}
+
+QSize LedWidget::sizeHint() const
+{
+    return QSize(20,20);
+}
+
+QSize LedWidget::minimumSizeHint() const
+{
+    return QSize(10, 10);
+}
+
+void LedWidget::setColor(QColor ledColor)
+{
+    if (m_color == ledColor) return;
+    m_color = ledColor;
+    update();
+    emit colorChanged(m_color);
+}
+
+bool LedWidget::isOn()
+{
+    return m_on;
+}
+
+void LedWidget::setOn(bool on)
+{
+    if (on == m_on) return;
+    m_on = on;
+    update();
+    emit onChanged(on);
+}
+
+void LedWidget::turnOn()
+{
+    setOn(true);
+}
+
+void LedWidget::turnOff()
+{
+    setOn(false);
+}
+
+void LedWidget::toggle()
+{
+    setOn(!m_on);
+}
+
+void LedWidget::paintEvent(QPaintEvent* event)
+{
+    Q_UNUSED(event)
+
+    const qreal r = std::min(width(), height()) / 2; // maximum radius including glow
+    const qreal glowOffset = std::max(2., r/5.);
+    const qreal borderOffset = std::max(1., r/10.);
+    const qreal shineOffset = std::max(1., r/20.);
+    const QPointF center(width()/2, height()/2);
+
+    const qreal gr = r;
+    const qreal br = gr - glowOffset;   // border shape radius
+    const qreal ir = br - borderOffset; // inner fill radius
+    const qreal sr = ir - shineOffset;
+
+    QColor borderColor(130,130,130);
+    QColor shineColor(255, 255, 255, m_on ? 200 : 50);
+    QColor fillColor(m_color);
+
+    QPainter painter(this);
+    painter.setRenderHints(QPainter::Antialiasing);
+
+    // draw border
+    painter.setPen(Qt::NoPen);
+    painter.setBrush(borderColor);
+    painter.drawEllipse(center, br, br);
+
+    // draw infill
+    if (!m_on) fillColor = fillColor.darker();
+    painter.setBrush(fillColor);
+    painter.drawEllipse(center, ir, ir);
+
+    // draw glow
+    if (m_on)
+    {
+        QColor glowColor(m_color);
+        glowColor.setAlphaF(0.5);
+        QRadialGradient glowGradient(center, gr, center);
+        glowGradient.setColorAt(0, glowColor);
+        glowGradient.setColorAt((r-glowOffset)/r, glowColor);
+        glowGradient.setColorAt(1, Qt::transparent);
+        painter.setBrush(glowGradient);
+        painter.drawEllipse(center, gr, gr);
+    }
+
+    // draw shine
+    QRadialGradient shineGradient(center, sr, center-QPoint(sr/2,sr/2));
+    shineGradient.setColorAt(0, shineColor);
+    shineGradient.setColorAt(1, Qt::transparent);
+    painter.setBrush(shineGradient);
+    painter.drawEllipse(center, sr, sr);
+}