diff --git a/src/datarecorder.h b/src/datarecorder.h
new file mode 100644
--- /dev/null
+++ b/src/datarecorder.h
@@ -0,0 +1,68 @@
+/*
+  Copyright © 2017 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/>.
+*/
+
+#ifndef DATARECORDER_H
+#define DATARECORDER_H
+
+#include <QObject>
+
+class DataRecorder : public QObject
+{
+    Q_OBJECT
+public:
+    explicit DataRecorder(QObject *parent = 0);
+
+    /**
+     * @brief Starts recording data to a file in CSV format.
+     *
+     * File is opened and header line (names of channels) is written.
+     *
+     * @param fileName name of the recording file
+     * @param channelNames names of the channels for header line, if empty no header line is written
+     * @return false if file operation fails (read only etc.)
+     */
+    bool startRecording(QString fileName, QStringList channelNames);
+
+    /**
+     * @brief Adds data to a channel.
+     *
+     * Multiple rows of data can be added at a time. Each channels
+     * data should be ordered consecutively in the `data` array:
+     *
+     * [CH0_SMP0, CH0_SMP1 ... CH0_SMPN, CH1_SMP0, CH1_SMP1, ... , CHN_SMPN]
+     *
+     * If `numOfChannels` changes during recording, no data will be
+     * lost (ie. it will be written to the file) but this will produce
+     * an invalid CSV file. An error message will be written to the
+     * console.
+     *
+     * @param data samples array
+     * @param length number of samples in `data`, must be multiple of `numOfChannels`
+     * @param numOfChannels how many channels samples this data carries
+     */
+    void addData(double* data, unsigned length, unsigned numOfChannels);
+
+    /// Stops recording, closes file.
+    void stopRecording();
+
+private:
+    unsigned lastNumChannels;   ///< used for error message only
+};
+
+#endif // DATARECORDER_H