diff --git a/mainwindow.cpp b/mainwindow.cpp
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -42,6 +42,9 @@ MainWindow::MainWindow(QWidget *parent) 
     QObject::connect(ui->spYmax, SIGNAL(valueChanged(double)),
                      this, SLOT(onYScaleChanged()));
 
+    QObject::connect(ui->actionClear, SIGNAL(triggered(bool)),
+                     this, SLOT(clearPlot()));
+
     // setup number format buttons
     numberFormatButtons.addButton(ui->rbUint8,  NumberFormat_uint8);
     numberFormatButtons.addButton(ui->rbUint16, NumberFormat_uint16);
@@ -265,6 +268,15 @@ void MainWindow::addData(double data)
     ui->plot->replot();
 }
 
+void MainWindow::clearPlot()
+{
+    dataArray.fill(0.0);
+
+    // update plot
+    curve.setSamples(dataX, dataArray);
+    ui->plot->replot();
+}
+
 void MainWindow::onNumOfSamplesChanged(int value)
 {
     unsigned int oldNum = this->numOfSamples;