diff --git a/.github/screenshot.png b/.github/screenshot.png
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index 0000000..2c647e6
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diff --git a/.gitignore b/.gitignore
index 894a44c..0a212a2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,6 @@
+# VS Code
+.vscode/
+
 # Byte-compiled / optimized / DLL files
 __pycache__/
 *.py[cod]
diff --git a/CHANGELOG.md b/CHANGELOG.md
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index 0000000..ef48dcc
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+++ b/CHANGELOG.md
@@ -0,0 +1,11 @@
+# Changelog
+
+### Legend :
+❌ Removed | ✔️ Added | 💫 Fixed | ✨ Improved
+
+## Version 0.1 - 29/05/19
+- ✔️ Upload monitor (Mbits/sec)
+- ✔️ Download monitor (Mbits/sec)
+- ✔️ Data consumed monitor (up & down) -> useful if you use your mobile data
+
+To close it, you need to close the terminal.
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diff --git a/README.md b/README.md
index d72ad1c..8ab876a 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,28 @@
-# NetworkTracker
-A simple python network tracker
+# Bandwidth monitor
+![Latest release](https://img.shields.io/github/release/N3ROO/BandwidthMonitor.svg)
+![opissues](https://img.shields.io/github/issues/N3ROO/BandwidthMonitor.svg) 
+![clissues](https://img.shields.io/github/issues-closed/N3ROO/BandwidthMonitor.svg)
+
+A simple python bandwidth monitor (upload / download).
+
+![preview](.github/screenshot.png)
+
+## 1. Getting started
+### 1.1 Prerequisites
+- [psutil](https://psutil.readthedocs.io/en/latest/index.html?highlight=net_io_counters)
+
+### 1.2 How to use it
+Run `python main.py`.
+
+### 1.3 Setting up your dev environment
+Open the folder with your favorite code editor, and the job is done. Run `pyinstaller bandwidth_monitor.spec` to generate an executable.
+
+## 2. Miscellaneous
+### 2.1 Changelog
+The changelog is available [here](CHANGELOG.md).
+
+### 2.2 Authors
+- **N3ROO** - *Initial work* - [Github](https://github.com/N3ROO) [Website](https://n3roo.github.io/)
+
+### 2.3 License
+This project is licensed under the MIT license - see the [LICENSE](LICENSE) file for details
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diff --git a/src/Tracker.py b/src/Tracker.py
new file mode 100644
index 0000000..021b5d1
--- /dev/null
+++ b/src/Tracker.py
@@ -0,0 +1,73 @@
+import psutil
+import time
+from threading import Thread
+
+
+# Index : number of bytes sent
+__BYTES_SENT__ = 0
+# Index : number of bytes received
+__BYTES_RECV__ = 1
+# Index : number of packets sent
+__PACKETS_SENT__ = 2
+# Index : number of packets received
+__PACKETS_RECV__ = 3
+# Index : total number of errors while receiving
+__ERR_IN__ = 4
+# Index : total number of errors while sending
+__ERR_OUT__ = 5
+# Index : total number of incoming packets which were dropped
+__DROP_IN__ = 6
+# Index : total number of outgoing packets which were dropped
+__DROP_OUT__ = 7
+
+
+class Tracker:
+
+    def __init__(self):
+        self.__reset_bytes_recv_vars__()
+        self.__reset_bytes_sent_vars__()
+        self.init_total_sent = self.__get_bytes_sent_total__()
+        self.init_total_recv = self.__get_bytes_recv_total__()
+
+
+    def get_total_data_used(self):
+        """ Returns the data used since the start 4G/3G ...
+        """
+        return ((self.__get_bytes_sent_total__() - self.init_total_sent) +
+                (self.__get_bytes_recv_total__() - self.init_total_recv))
+
+
+    def get_current_upload_speed(self):
+        """ Returns the current upload speed in bytes per seconds.
+        """
+        dtime = time.time() - self.last_bytes_sent_time
+        dsent = self.__get_bytes_sent_total__() - self.last_bytes_sent_total
+        self.__reset_bytes_sent_vars__()
+        return dsent / dtime if dtime != 0 else 0
+
+
+    def get_current_download_speed(self):
+        """ Returns the current downlaod speed in bytes per seconds.
+        """
+        dtime = time.time() - self.last_bytes_recv_time
+        dsent = self.__get_bytes_recv_total__() - self.last_bytes_recv_total
+        self.__reset_bytes_recv_vars__()
+        return dsent / dtime if dtime != 0 else 0
+
+
+    def __reset_bytes_sent_vars__(self):
+        self.last_bytes_sent_total = self.__get_bytes_sent_total__()
+        self.last_bytes_sent_time = time.time()
+
+
+    def __reset_bytes_recv_vars__(self):
+        self.last_bytes_recv_total = self.__get_bytes_recv_total__()
+        self.last_bytes_recv_time = time.time()
+
+
+    def __get_bytes_sent_total__(self):
+        return psutil.net_io_counters(pernic=False)[__BYTES_SENT__]
+
+
+    def __get_bytes_recv_total__(self):
+        return psutil.net_io_counters(pernic=False)[__BYTES_RECV__]
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diff --git a/src/bandwidth_monitor.py b/src/bandwidth_monitor.py
new file mode 100644
index 0000000..9dad947
--- /dev/null
+++ b/src/bandwidth_monitor.py
@@ -0,0 +1,92 @@
+import logging
+import time
+import numpy
+import matplotlib.pyplot as plt
+
+from Tracker import Tracker
+from datetime import datetime
+
+
+logger = logging.getLogger(__name__)
+# Data shown on the plot represents the last 1 minutes
+DATA_DURATION = 5
+# The data variable
+speeds_recv = []
+speeds_sent = []
+times = []
+
+def main():
+    """ Executes the program.
+    """
+    tracker = Tracker()
+    plt.ion()
+    last_total_data_used = 0
+
+    while True:
+        # Retrieve the up and down speeds
+        time.sleep(0.5)
+        down_speed = 8 * (tracker.get_current_download_speed() / (2**20))
+        up_speed = 8 * (tracker.get_current_upload_speed() / (2**20))
+
+        # Store it
+        add_data(down_speed, up_speed)
+
+        # Data used
+        total_data_used = round(tracker.get_total_data_used() / (2**20), 3)
+        write_data_used(last_total_data_used, total_data_used)
+        last_total_data_used = total_data_used
+
+        # Update & display the plot
+        recv_curve, = plt.plot(times, speeds_recv)
+        sent_curve, = plt.plot(times, speeds_sent)
+
+        plt.legend([recv_curve, sent_curve], ['Download', 'Upload'])
+        plt.ylabel('Mb/s', fontsize=8)
+        ax = plt.gca()
+        ax.tick_params(axis='x', labelsize=6)
+        ax.tick_params(axis='y', labelsize=6)
+        ax.get_figure().canvas.set_window_title('Internet speed - N3RO')
+
+        plt.draw()
+        plt.pause(0.0001)
+        plt.clf()
+
+
+def add_data(down_speed, up_speed):
+    if len(times) > 1:
+        if divmod((times[-1] - times[0]).total_seconds(), 60)[0] >= DATA_DURATION:
+            del times[0]
+            del speeds_recv[0]
+            del speeds_sent[0]
+    speeds_recv.append(down_speed)
+    speeds_sent.append(up_speed)
+    times.append(datetime.now())
+
+
+def write_data_used(last_total_data_used, total_data_used):
+    if total_data_used != last_total_data_used:
+        if total_data_used > last_total_data_used + 0.5:
+            print('!! ' + str(total_data_used) + ' Mo used.')
+        elif total_data_used > last_total_data_used + 1:
+            print('! ' + str(total_data_used) + ' Mo used.')
+        else:
+            print(str(total_data_used) + ' Mo used.')
+
+
+if __name__ == '__main__':
+    logger = logging.getLogger()
+    logger.setLevel(logging.DEBUG)
+    formatter = logging.Formatter('%(asctime)s ' +
+                                  '-- %(levelname)s ' +
+                                  '-- [%(filename)s:%(lineno)s ' +
+                                  '-- %(funcName)s() ] ' +
+                                  '-- %(message)s')
+    stream_handler = logging.StreamHandler()
+    stream_handler.setLevel(logging.DEBUG)
+    stream_handler.setFormatter(formatter)
+    logger.addHandler(stream_handler)
+
+    try:
+        main()
+    except Exception as e:
+        logger.exception('Unexpected error')
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