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:
- 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):
- Hardware: Die jeweiligen RX-Pins mit den TX-Pins des anderen Arduino verbunden.
- Gemeinsame Masse (GND): Verbinde die GND-Pins beider Arduinos.
- Programmierung:
- Verwenden der
Serial-Bibliothek in der Arduino-IDE. - Beispielcode (Sender):
void setup() { Serial.begin(9600); } void loop() { Serial.println("Hallo von Arduino 1"); delay(1000); } - Beispielcode (Empfänger):
void setup() { Serial.begin(9600); } void loop() { if (Serial.available() > 0) { String message = Serial.readString(); Serial.println("Empfangene Nachricht: " + message); } }
- Verwenden der
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);
}
}
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