diff --git a/.gitignore b/.gitignore
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+/.HA_VERSION
+/.cloud
+/.storage
+/.vscode
+/automations.yaml
+/configuration.yaml
+/deps
+/groups.yaml
+/home-assistant.log
+/home-assistant_v2.db
+/scenes.yaml
+/scripts.yaml
+/secrets.yaml
+/tts
+/custom_components/emt_madrid/__pycache__
+*.pyc
\ No newline at end of file
diff --git a/LICENSE b/LICENSE
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+++ b/LICENSE
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+MIT License
+
+Copyright (c) 2020 Fernando Martínez
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/README.md b/README.md
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--- /dev/null
+++ b/README.md
@@ -0,0 +1,99 @@
+_Please :star: this repo if you find it useful_
+
+# EMT Madrid bus platform for Home Assistant
+
+This is a custom sensor for Home Assistant that allows you tu have the waiting time for a specific Madrid-EMT bus stop. Each sensor will provide the arrival time for the next 2 buses of the line specified in the configuration.
+
+Thanks to [EMT Madrid MobilityLabs](https://mobilitylabs.emtmadrid.es/) for providing the data and [documentation](https://apidocs.emtmadrid.es/).
+
+![Example](example.png)
+
+## Prerequisites
+
+To use the EMT Mobilitylabs API you need to register in their [website](https://mobilitylabs.emtmadrid.es/). You have to provide a valid email account and a password that will be used to configure the sensor. Once you are registered you will receive a confirmation email to activate your account. It will not work until you have completed all the steps.
+
+## Manual Installation
+
+1. Using the tool of choice open the directory (folder) for your HA configuration (where you find `configuration.yaml`).
+1. If you do not have a `custom_components` directory (folder) there, you need to create it.
+1. In the `custom_components` directory (folder) create a new folder called `emt_madrid`.
+1. Download _all_ the files from the `custom_components/emt_madrid/` directory (folder) in this repository.
+1. Place the files you downloaded in the new directory (folder) you created.
+1. Restart Home Assistant
+1. Add `emt_madrid` sensor to your `configuration.yaml` file:
+
+   ```yaml
+   # Example configuration.yaml entry
+   sensor:
+     - platform: emt_madrid
+       email: !secret EMT_EMAIL
+       password: !secret EMT_PASSWORD
+       stop: "72"
+       line: "27"
+       name: "Bus 27 en Cibeles"
+       icon: "mdi:fountain"
+   ```
+
+### Configuration Variables
+
+**email**:\
+ _(string) (Required)_\
+ Email account used to register in the EMT Madrid API.
+
+**password**:\
+ _(string) (Required)_\
+ Password used to register in the EMT Madrid API.
+
+**stop**:\
+ _(string) (Required)_\
+ Bus stop ID.
+
+**line**:\
+ _(string) (Required)_\
+ Bus line that stops at the previous bus stop.
+
+**name**:\
+ _(string) (Optional)_\
+ Name to use in the frontend.
+_Default value: "Bus <bus_line> at <bus_stop>"_
+
+**icon**:\
+ _(string) (Optional)_\
+ Icon to use in the frontend.
+_Default value: "mdi:bus"_
+
+## Sensor status and attributes
+
+Once you have you sensor up and running it will update the data automatically every 30 seconds and you should have the following data:
+
+**state**:\
+ _(int)_\
+ Arrival time in minutes for the next bus. It will show "-" when there are no more buses coming and 30 when the arrival time is over 30 minutes.
+
+### Attributes
+
+**later_bus**:\
+ _(int)_\
+ Arrival time in minutes for the second bus. It will show "-" when there are no more buses coming and 30 when the arrival time is over 30 minutes.
+
+**bus_stop_id**:\
+ _(int)_\
+ Bus stop id given in the configuration.
+
+**bus_line**:\
+ _(int)_\
+ Bus line given in the configuration.
+
+### Second bus sensor
+
+If you want to have a specific sensor to show the arrival time for the second bus, you can add the following lines to your `configuration.yaml` file below the `emt_madrid` bus sensor. See the official Home Assistant [template sensor](https://www.home-assistant.io/integrations/template/) for more information.
+
+```yaml
+# Example configuration.yaml entry
+- platform: template
+  sensors:
+    siguiente_27:
+      friendly_name: "Siguiente bus 27"
+      unit_of_measurement: "min"
+      value_template: "{{ state_attr('sensor.bus_27_en_cibeles', 'later_bus') }}"
+```
diff --git a/custom_components/emt_madrid/__init__.py b/custom_components/emt_madrid/__init__.py
new file mode 100755
index 0000000..c449013
--- /dev/null
+++ b/custom_components/emt_madrid/__init__.py
@@ -0,0 +1 @@
+"""Madrid EMT bus sensor."""
\ No newline at end of file
diff --git a/custom_components/emt_madrid/manifest.json b/custom_components/emt_madrid/manifest.json
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index 0000000..be37f4e
--- /dev/null
+++ b/custom_components/emt_madrid/manifest.json
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+{
+  "domain": "emt_madrid",
+  "name": "EMT Madrid",
+  "documentation": "https://github.com/fermartv/EMT-Madrid/",
+  "issue_tracker": "https://github.com/fermartv/EMT-Madrid/issues",
+  "codeowners": ["@FerMartV"],
+  "version": "1.0.1"
+}
diff --git a/custom_components/emt_madrid/sensor.py b/custom_components/emt_madrid/sensor.py
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--- /dev/null
+++ b/custom_components/emt_madrid/sensor.py
@@ -0,0 +1,199 @@
+import requests
+import json
+import math
+
+import logging
+
+import voluptuous as vol
+
+"""Platform for sensor integration."""
+from homeassistant.components.sensor import PLATFORM_SCHEMA
+from homeassistant.const import (
+    ATTR_ATTRIBUTION,
+    CONF_EMAIL,
+    CONF_ICON,
+    CONF_NAME,
+    CONF_PASSWORD,
+    TIME_MINUTES,
+)
+
+import homeassistant.helpers.config_validation as cv
+from homeassistant.helpers.entity import Entity
+
+ATTRIBUTION = "Data provided by EMT Madrid MobilityLabs"
+
+CONF_STOP = "stop"
+CONF_LINE = "line"
+
+DEFAULT_NAME = "EMT Madrid"
+DEFAULT_ICON = "mdi:bus"
+
+ATTR_NEXT_UP = "later_bus"
+ATTR_BUS_STOP = "bus_stop_id"
+ATTR_BUS_LINE = "bus_line"
+
+BASE_URL = "https://openapi.emtmadrid.es/"
+ENDPOINT_LOGIN = "v1/mobilitylabs/user/login/"
+ENDPOINT_ARRIVAL_TIME = "v2/transport/busemtmad/stops/"
+
+PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
+    {
+        vol.Required(CONF_EMAIL): cv.string,
+        vol.Required(CONF_PASSWORD): cv.string,
+        vol.Required(CONF_STOP): cv.string,
+        vol.Required(CONF_LINE): cv.string,
+        vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
+        vol.Optional(CONF_ICON, default=DEFAULT_ICON): cv.string,
+    }
+)
+
+_LOGGER = logging.getLogger(__name__)
+
+
+def setup_platform(hass, config, add_entities, discovery_info=None):
+    """Set up the sensor platform."""
+    email = config.get(CONF_EMAIL)
+    password = config.get(CONF_PASSWORD)
+    bus_stop = config.get(CONF_STOP)
+    line = config.get(CONF_LINE)
+    name = config.get(CONF_NAME)
+    icon = config.get(CONF_ICON)
+    api_emt = APIEMT(email, password)
+    api_emt.update(bus_stop, line)
+    add_entities([BusStopSensor(api_emt, bus_stop, line, name, icon)])
+
+
+class BusStopSensor(Entity):
+    """Implementation of an EMT-Madrid bus stop sensor."""
+
+    def __init__(self, api_emt, bus_stop, line, name, icon):
+        """Initialize the sensor."""
+        self._state = None
+        self._api_emt = api_emt
+        self._bus_stop = bus_stop
+        self._bus_line = line
+        self._icon = icon
+        self._name = name
+        if self._name == DEFAULT_NAME:
+            self._name = "Next {} at {}".format(self._bus_line, self._bus_stop)
+
+    @property
+    def name(self):
+        """Return the name of the sensor."""
+        return self._name
+
+    @property
+    def state(self):
+        """Return the state of the sensor."""
+        return self._api_emt.get_stop_data(self._bus_line, "arrival")
+
+    @property
+    def unit_of_measurement(self):
+        """Return the unit of measurement."""
+        return TIME_MINUTES
+
+    @property
+    def icon(self):
+        """Return sensor specific icon."""
+        return self._icon
+
+    @property
+    def extra_state_attributes(self):
+        """Return the device state attributes."""
+        return {
+            ATTR_NEXT_UP: self._api_emt.get_stop_data(self._bus_line, "next_arrival"),
+            ATTR_BUS_STOP: self._bus_stop,
+            ATTR_BUS_LINE: self._bus_line,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
+        }
+
+    def update(self):
+        """Fetch new state data for the sensor."""
+        self._api_emt.update(self._bus_stop, self._bus_line)
+
+
+class APIEMT:
+    """
+    Interface for the EMT REST API. Docs at https://apidocs.emtmadrid.es/
+    """
+
+    def __init__(self, user, password):
+        """ Initialize the class and retrieve the token from the API. """
+        self._user = user
+        self._password = password
+        self.token = self.update_token()
+
+    def update(self, stop, line):
+        """ Update the arrival times data from the API. """
+        url = "{}{}{}/arrives/{}/".format(BASE_URL, ENDPOINT_ARRIVAL_TIME, stop, line)
+        headers = {"accessToken": self.token}
+        data = {"stopId": stop, "lineArrive": line, "Text_EstimationsRequired_YN": "Y"}
+        response = self.api_call(url, headers, data)
+        try:
+            self.set_stop_data(response, line)
+        except:
+            _LOGGER.error("Invalid stop ID")
+            raise Exception("Unable to get the arrival times from the API")
+
+    def set_stop_data(self, data, target_line):
+        """ Create a dictionary to store the arrival time data in the following format:
+            {
+                line:{
+                    'arrival': arrival_time,
+                    'next_arrival': arrival_time
+                }
+            }
+         """
+        arrival_data = {}
+
+        for bus in data["data"][0]["Arrive"]:
+            estimated_time = math.trunc(bus["estimateArrive"] / 60)
+            if estimated_time > 30:
+                estimated_time = 30
+            line = bus["line"]
+            if line not in arrival_data:
+                arrival_data[line] = {"arrival": estimated_time}
+            elif "next_arrival" not in arrival_data[line]:
+                arrival_data[line]["next_arrival"] = estimated_time
+
+        if target_line not in arrival_data:
+            arrival_data[target_line] = {"arrival": "-"}
+        if "next_arrival" not in arrival_data[target_line]:
+            arrival_data[target_line]["next_arrival"] = "-"
+        self._arrival_time = arrival_data
+
+    def get_stop_data(self, line, bus):
+        """ Get the data of the next bus ("arrival") or the one after that ("next_arrival") """
+        return self._arrival_time[str(line)][bus]
+
+    def api_call(self, url, headers, payload=None, method="POST"):
+        """ Request data from the API. """
+        if method == "POST":
+            payload = json.dumps(payload)
+            response = requests.post(url, data=payload, headers=headers)
+
+        elif method == "GET":
+            response = requests.get(url, headers=headers)
+
+        else:
+            raise Exception("Invalid HTTP method: " + method)
+
+        if response.status_code != 200:
+            _LOGGER.error("Invalid response: %s", response.status_code)
+        return response.json()
+
+    def update_token(self):
+        """ Update or create the token when the sensor is initialized. """
+        headers = {"email": self._user, "password": self._password}
+        url = BASE_URL + ENDPOINT_LOGIN
+        response = self.api_call(url, headers, None, "GET")
+        try:
+            self.token = response["data"][0]["accessToken"]
+        except:
+            if response["code"] == "80":
+                _LOGGER.error("Invalid credentials")
+            else:
+                _LOGGER.error("Unable to retrieve the token from the API")
+            raise Exception("Unable to connect to the API")
+        return self.token
+
diff --git a/example.png b/example.png
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diff --git a/hacs.json b/hacs.json
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+++ b/hacs.json
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+{
+  "name": "EMT-Madrid bus",
+  "render_readme": true,
+  "country": "ES",
+  "domains": ["sensor"]
+}