# Microcontrolling

##### **Material:** 

- 1x Arduino Nano
- 1x ESP8266
- 3x LED (Aktor)
- 1x BME680 (Sensor)
- 1x LCD 1602 Modul(Aktor)
- 2x Widerstände (220Ω & 470Ω)

##### **Grobes Konzept:**

Messung und Monitoring der Luftqualität und anderen Umgebungsdaten. Ausgabe der Messung wird auf einem LCD-Display ausgegeben. Sobald ein bestimmter Grenzwert über- oder unterschritten werden, leuchten eine oder mehr LEDs auf.

##### **Zeitplan:**

1. Doppelstunde: Brainstorming was wir machen wollen.

- Alarmanlage mit Bewegungssensor
- MQTT-Luftqualitätsmesser
- MQTT-Lichtsteuerung

2\. Doppelstunde: Alle benötigten Materialien aufgezeichnet und rausgesucht. Begonnen die Dokumentation zu verfassen. Installieren der Arduino IDE.

##### **Verbindung zwischen den beiden Arduino aufgebaut:**

##### Serielle Kommunikation (UART):

1. **Hardware**: Die jeweiligen RX-Pins mit den TX-Pins des anderen Arduino verbunden.
2. **Gemeinsame Masse (GND)**: Verbinde die GND-Pins beider Arduinos.
3. **Programmierung**: 
    - Verwenden der `Serial`-Bibliothek in der Arduino-IDE.
    - Beispielcode (Sender): <div class="bg-black rounded-md"><div class="p-4 overflow-y-auto">`<span class="hljs-function"><span class="hljs-type">void</span> <span class="hljs-title">setup</span><span class="hljs-params">()</span> </span>{    Serial.<span class="hljs-built_in">begin</span>(<span class="hljs-number">9600</span>);}<span class="hljs-function"><span class="hljs-type">void</span> <span class="hljs-title">loop</span><span class="hljs-params">()</span> </span>{    Serial.<span class="hljs-built_in">println</span>(<span class="hljs-string">"Hallo von Arduino 1"</span>);    <span class="hljs-built_in">delay</span>(<span class="hljs-number">1000</span>);}`</div></div>
    - Beispielcode (Empfänger): <div class="bg-black rounded-md"><div class="p-4 overflow-y-auto">`<span class="hljs-function"><span class="hljs-type">void</span> <span class="hljs-title">setup</span><span class="hljs-params">()</span> </span>{    Serial.<span class="hljs-built_in">begin</span>(<span class="hljs-number">9600</span>);}<span class="hljs-function"><span class="hljs-type">void</span> <span class="hljs-title">loop</span><span class="hljs-params">()</span> </span>{    <span class="hljs-keyword">if</span> (Serial.<span class="hljs-built_in">available</span>() > <span class="hljs-number">0</span>) {        String message = Serial.<span class="hljs-built_in">readString</span>();        Serial.<span class="hljs-built_in">println</span>(<span class="hljs-string">"Empfangene Nachricht: "</span> + message);    }}`</div></div><div class="p-4 overflow-y-auto">  
        </div>

[![image.png](https://mach7.space/uploads/images/gallery/2023-11/scaled-1680-/GwlJHgN2TJ1HpMk1-image.png)](https://mach7.space/uploads/images/gallery/2023-11/GwlJHgN2TJ1HpMk1-image.png)

Code für den ESP8266:

`#include <ArduinoMqttClient.h>#include <Adafruit_NeoPixel.h>#include <ESP8266WiFi.h>#include <Wire.h>#include <LiquidCrystal.h>#define wifi_ssid "Bunker"#define wifi_password "DasIstNichtDasPasswort"WiFiClient espClient;MqttClient mqttClient(espClient);const char broker[] = "nioy.de";int        port        = 1883;const char willTopic[] = "arduino/error";#define MQTT_Topic_Status "JJ-Test/Wetterstation/ESP8266_Status"#define MQTT_Topic_LCD "JJ-Lab/Wetterstation/LCD"const long interval = 2000;unsigned long previousMillis = 0;bool debug = false;unsigned long delayTime = 20;unsigned long lastHeapCheck = 0;const unsigned long heapCheckInterval = 60000;unsigned long lastMessageTime = 0;const unsigned long timeout = 10000;int cnt=129600;const int rs = 16, en = 0, d4 = 2, d5 = 14, d6 = 12, d7 = 13;LiquidCrystal lcd(rs, en, d4, d5, d6, d7);void setup() {  lcd.begin(16, 2);  lcd.print("Starte nun...");  Serial.begin(9600);  pinMode(LED_BUILTIN, OUTPUT);  digitalWrite(LED_BUILTIN, HIGH);  delay(60);  Serial.println(" ");  Serial.println("Moin Moin ....");  Serial.println("Der Arduino Startet nun     //JJ");  lcd.setCursor(0, 0);  lcd.print("Attempting to");  lcd.setCursor(0, 1);  lcd.print("connect to WPA");  Serial.print("Attempting to connect to WPA SSID: ");  Serial.println(wifi_ssid);  while (WiFi.begin(wifi_ssid, wifi_password) != WL_CONNECTED) {    Serial.print(".");    delay(5000);  }  digitalWrite(LED_BUILTIN, LOW);  Serial.print("Ich habe die IP Addresse : ");  Serial.print(WiFi.localIP());  lcd.begin(0, 2);  lcd.print(WiFi.localIP());  delay(60);  Serial.println("You're connected to the network");  Serial.println();  /*  String willPayload = "oh no!";  bool willRetain = true;  int willQos = 1;  mqttClient.beginWill(willTopic, willPayload.length(), willRetain, willQos);  mqttClient.print(willPayload);  mqttClient.endWill();  */  Serial.print("Attempting to connect to the MQTT broker: ");  Serial.println(broker);  if (!mqttClient.connect(broker, port)) {    Serial.print("MQTT connection failed! Error code = ");    Serial.println(mqttClient.connectError());    while (1);  }  Serial.println("You're connected to the MQTT broker!");  Serial.println();  mqttClient.onMessage(onMqttMessage);  Serial.print("Subscribing to topic: ");  Serial.println(MQTT_Topic_LCD);  int subscribeQos = 1;  mqttClient.subscribe(MQTT_Topic_LCD, subscribeQos);  // topics can be unsubscribed using:  // mqttClient.unsubscribe(MQTT_Topic_LED);  Serial.print("Waiting for messages on topic: ");  Serial.println(MQTT_Topic_LCD);  Serial.println();  mqttClient.beginMessage(MQTT_Topic_Status);  mqttClient.print("Ready");  mqttClient.endMessage();  /*  if ( hello_start )  {  }  */  ESP.wdtEnable(WDTO_8S);}void loop() {  Serial.println(cnt);  if(cnt==20){    mqttClient.beginMessage(MQTT_Topic_Status);    mqttClient.print("Reset ESP8266 equal");    mqttClient.endMessage();    delay(120);  }  if(cnt==0){    Serial.println("Reset..");    mqttClient.beginMessage(MQTT_Topic_Status);    mqttClient.print("Reset ESP8266 now....");    mqttClient.endMessage();    delay(120);    ESP.restart();  }  cnt--;  delay(50);  ESP.wdtFeed();  mqttClient.poll();  unsigned long currentMillis = millis();  if (currentMillis - lastHeapCheck >= heapCheckInterval) {    lastHeapCheck = currentMillis;    Serial.print("Free Heap: ");    Serial.println(ESP.getFreeHeap());    mqttClient.beginMessage(MQTT_Topic_Status);    mqttClient.print(ESP.getFreeHeap());    mqttClient.endMessage();  }  if (currentMillis - previousMillis >= interval) {    previousMillis = currentMillis;    bool retained = false;    int qos = 1;    bool dup = false;    mqttClient.beginMessage(MQTT_Topic_Status);    mqttClient.print("Online");    mqttClient.endMessage();  }  mqttClient.poll();  if (currentMillis - previousMillis >= interval) {    previousMillis = currentMillis;    bool retained = false;    int qos = 1;    bool dup = false;    mqttClient.beginMessage(MQTT_Topic_Status);    mqttClient.print("Online");    mqttClient.endMessage();  }  mqttClient.poll();}void onMqttMessage(int messageSize) {  if (debug) {    Serial.print("Received a message with topic '");    Serial.print(mqttClient.messageTopic());    Serial.print("', duplicate = ");    Serial.print(mqttClient.messageDup() ? "true" : "false");    Serial.print(", QoS = ");    Serial.print(mqttClient.messageQoS());    Serial.print(", retained = ");    Serial.print(mqttClient.messageRetain() ? "true" : "false");    Serial.print("', length ");    Serial.print(messageSize);    Serial.println(" bytes:");  }  if (strcmp(mqttClient.messageTopic().c_str(), MQTT_Topic_LCD) == 0)  {    lastMessageTime = millis();    Serial.println("Neue Nachricht empfangen:");    Serial.println("Topic: " + mqttClient.messageTopic());    Serial.print("Payload: ");    // Konvertiere das Payload-Array in einen String    String payloadString;    for (int i = 0; i < messageSize; i++) {      payloadString += (char)mqttClient.read();    }    Serial.println(payloadString);    int maxLineLength = 16;    String line1 = payloadString.substring(0, maxLineLength);    String line2 = payloadString.length() > maxLineLength ? payloadString.substring(maxLineLength) : "";    lcd.setCursor(0, 0);    lcd.print(line1);    lcd.setCursor(0, 1);    lcd.print(line2);  }}`