Adding code

docs/hardware.md

@@ -77,6 +77,139 @@ while True:
     sleep(3000)
 ```
 
+![](https://i.imgur.com/ExQyuu5.jpg)
+
+```python=
+import network
+import config
+from machine import Pin
+from time import sleep
+from umqtt.simple import MQTTClient
+
+
+class HomeAutomation:
+
+    def __init__(self, ledpin: int, lightpin: int, ssid: str,
+                 password: str, host: str, port: int, topic: str):
+        """
+
+        :param ledpin:
+        :param lightpin:
+        :param ssid:
+        :param password:
+        :param host:
+        :param port:
+        :param topic:
+        """
+        self.ledpin = Pin(ledpin, Pin.OUT)
+        self.lightpin = Pin(lightpin, Pin.OUT)
+        self.ssid = ssid
+        self.password = password
+        self.host = host
+        self.port = port
+        self.topic = topic
+
+    def boardTest(self):
+        """
+        Testing the board by blinking LED
+        :return:
+        """
+        print("INFO: Blinking LED")
+        for i in range(0, 5, 1):
+            self.ledpin.value(not self.ledpin.value())
+            sleep(1)
+            i = i + 1
+        print("INFO: Board is fine")
+
+    def turn_on(self):
+        """
+        Turns on the lights
+        :return:
+        """
+        self.lightpin.value(1)
+        print("INFO: Turning on lights")
+
+    def turn_off(self):
+        """
+        Turns off the lights
+        :return:
+        """
+        self.lightpin.value(0)
+        print("INFO: Turning off lights")
+
+    def wifiConnect(self):
+        """
+        Connects to the config wifi
+        :return:
+        """
+        print("INFO: Connecting to wifi")
+        station = network.WLAN(network.STA_IF)  # create station interface
+        station.active(True)  # activate the interface
+        if station.isconnected():
+            print("INFO: Connected to wifi initially")
+        else:
+            while True:
+                try:
+                    scanned_wifi = station.scan()  # scan for access points
+                    for i in scanned_wifi:
+                        if i[0].decode('utf-8') == self.ssid:
+                            # Connect to wifi
+                            station.connect(self.ssid, self.password)
+                            print("INFO: Connected to wifi")
+                            break
+                        else:
+                            print("INFO: Wifi Not found")
+                            self.wifiConnect()
+                    break
+                except OSError as e:
+                    print("Error: ", e)
+
+    def on_message(self, topic, msg):
+        """
+        This callback is used to process messages
+        that are published to a subscribed topic.
+        :param topic:
+        :param msg:
+        :return:
+        """
+        message = msg.decode("utf-8")
+        if message == "ON":
+            self.turn_on()
+        elif message == "OFF":
+            self.turn_off()
+
+    def main(self):
+        """
+        Main function runs the board test, connects to wifi and mqtt server
+        and finally waits for oncoming messages
+        :return:
+        """
+        self.boardTest()
+        self.wifiConnect()
+        print("INFO: Connecting to MQTT")
+        client = MQTTClient("umqtt_client", self.host, self.port)
+        client.set_callback(self.on_message)
+        client.connect()
+        print("INFO: Connected to MQTT")
+        client.subscribe(self.topic)
+        while True:
+            client.wait_msg()
+
+
+def run():
+    homeautomation = HomeAutomation(ledpin=2, lightpin=5,
+                                    ssid=config.WIFI_ESSID,
+                                    password=config.WIFI_PASSWORD,
+                                    host=config.MQTT_HOST,
+                                    port=config.MQTT_PORT,
+                                    topic=config.MQTT_TOPIC)
+    homeautomation.main()
+
+
+if __name__ == "__main__":
+    run()
+
+```
 ## APPLICATIONS
 
 * home automation