Edit Readme

CO2-Ampel.ino

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+/* This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU General Public License for more details. */
+
+#include <ESP8266WiFi.h>
+#include <PubSubClient.h>
+#include <Adafruit_NeoPixel.h>
+#include <SparkFun_SCD30_Arduino_Library.h>
+#include <Wire.h>
+
+String matrixausgabe_text  = " "; // Ausgabetext als globale Variable
+
+volatile int matrixausgabe_index = 0;// aktuelle Position in Matrix
+
+IPAddress myOwnIP; // ownIP for mDNS 
+
+//-------------- definition mqtt-object ueber WiFi
+WiFiClient   espClient; 
+PubSubClient mqttclient(espClient);
+
+//--------- list of mqtt callback functions 
+#define MAX_MQTT_SUB 10 // maximal 10 subscriptions erlaubt
+typedef void (*mqtthandle) (byte*,unsigned int);
+typedef struct {       // Typdeklaration Callback
+  String topic;        // mqtt-topic
+  mqtthandle fun;      // callback function 
+}
+subscribe_type; 
+subscribe_type mqtt_sub[MAX_MQTT_SUB];
+int mqtt_sub_count=0;
+
+String MQTT_Rx_Payload = "" ;
+//--------- mqtt callback function 
+void mqttcallback(char* to, byte* pay, unsigned int len) {
+  String topic   = String(to);
+  String payload = String((char*)pay);
+  MQTT_Rx_Payload=payload.substring(0,len);
+  Serial.println("\ncallback topic:" + topic + ", payload:" + MQTT_Rx_Payload);
+  for (int i=0;i<mqtt_sub_count;i++) { // durchsuche alle subscriptions, bis topic passt 
+    if (topic==mqtt_sub[i].topic) 
+      mqtt_sub[i].fun(pay,len);         // Aufruf der richtigen callback-Funktion
+  }
+}
+
+//------------ reconnect mqtt-client
+void mqttreconnect() { // Loop until we're reconnected 
+  if (!mqttclient.connected()) { 
+    while (!mqttclient.connected()) { 
+      Serial.print("Attempting MQTT connection...");
+      if (mqttclient.connect("CO2Ampel" , "user", "passwort" )) {
+        Serial.println("connected");
+        for (int i=0;i<mqtt_sub_count;i++) { // subscribe topic
+          mqttclient.subscribe(mqtt_sub[i].topic.c_str());
+          Serial.println("\nsubscribe");
+          Serial.print(mqtt_sub[i].topic);
+        }
+      } 
+      else { 
+        Serial.print("failed, rc=");
+        Serial.print(mqttclient.state());
+        Serial.println(" try again in 5 seconds");
+        delay(5000);
+      }
+    }
+  } 
+  else { 
+    mqttclient.loop(); 
+  }
+}
+
+Adafruit_NeoPixel pixels = Adafruit_NeoPixel(2,13,NEO_GRBW + NEO_KHZ800);
+//Reading CO2, humidity and temperature from the SCD30 By: Nathan Seidle SparkFun Electronics 
+
+//https://github.com/sparkfun/SparkFun_SCD30_Arduino_Library
+
+SCD30 airSensorSCD30; // Objekt SDC30 Umweltsensor
+int co2 = 0 ;
+int temp = 0 ;
+int hum = 0 ;
+
+void setup(){ // Einmalige Initialisierung
+  Serial.begin(115200);
+  //----------------------------------MQTT-Client 
+  mqttclient.setServer("192.168.1.XX", 1883);
+  mqttclient.setCallback(mqttcallback);
+
+  pixels.begin();//-------------- Initialisierung Neopixel
+  delay(1);
+  pixels.show();
+  pixels.setPixelColor(0,0,0,0,0); // alle aus
+  pixels.setPixelColor(1,0,0,0,0);
+  pixels.show();                 // und anzeigen
+
+  Wire.begin(); // ---- Initialisiere den I2C-Bus 
+
+  if (Wire.status() != I2C_OK) Serial.println("Something wrong with I2C");
+
+  if (airSensorSCD30.begin() == false) {
+    Serial.println("The SCD30 did not respond. Please check wiring."); 
+    while(1) {
+      yield(); 
+      delay(1);
+    } 
+  }
+
+  airSensorSCD30.setAutoSelfCalibration(false); // Sensirion no auto calibration
+
+  airSensorSCD30.setMeasurementInterval(2);     // CO2-Messung alle 5 s
+
+  //------------ WLAN initialisieren 
+  WiFi.persistent(false);
+  WiFi.mode(WIFI_STA);
+  delay(100);
+  Serial.print ("\nWLAN connect to:");
+  Serial.print("WIFI");
+  WiFi.begin("SSID","PASSWORD-XXX");
+  while (WiFi.status() != WL_CONNECTED) { // Warte bis Verbindung steht 
+    delay(500); 
+    Serial.print(".");
+  };
+  Serial.println ("\nconnected, meine IP:"+ WiFi.localIP().toString());
+  matrixausgabe_text = " Meine IP:" + WiFi.localIP().toString();
+  myOwnIP = WiFi.localIP();
+  matrixausgabe_index=0;
+
+
+  pixels.setPixelColor(0,40,0,0,0);
+  pixels.show();
+  delay( 3000 );
+
+  // Forced Calibration Sensirion SCD 30
+  airSensorSCD30.setAltitudeCompensation(545); // Altitude in m ü NN 
+  airSensorSCD30.setForcedRecalibrationFactor(400); // fresh air 
+
+  delay( 3000 );
+
+  Wire.setClock(100000L);            // 100 kHz SCD30 
+  Wire.setClockStretchLimit(200000L);// CO2-SCD30
+}
+
+void loop() { // Kontinuierliche Wiederholung 
+  co2 = airSensorSCD30.getCO2() ;
+  temp = airSensorSCD30.getTemperature() ;
+  hum = airSensorSCD30.getHumidity() ;
+  if (( ( co2 ) < ( 700 ) ))
+  {
+    pixels.setPixelColor(0,0,30,0,0);
+    pixels.show();
+  }
+  else
+  {
+    if (( ( co2 ) > ( 700 ) ))
+    {
+      pixels.setPixelColor(0,30,30,0,0);
+      pixels.show();
+      if (( ( co2 ) > ( 1000 ) ))
+      {
+        pixels.setPixelColor(0,40,0,0,0);
+        pixels.show();
+      }
+    }
+    else
+    {
+    }
+  }
+  delay( 1000 );
+  mqttreconnect();
+  {
+    String pay=String(String(co2));
+    mqttclient.publish("sensor/CO2",pay.c_str());
+    Serial.print("\nmqtt publish: "); 
+    Serial.print(pay);
+  };
+  mqttreconnect();
+  {
+    String pay=String(String(temp));
+    mqttclient.publish("sensor/temp",pay.c_str());
+    Serial.print("\nmqtt publish: "); 
+    Serial.print(pay);
+  };
+  mqttreconnect();
+  {
+    String pay=String(String(hum));
+    mqttclient.publish("sensor/hum",pay.c_str());
+    Serial.print("\nmqtt publish: "); 
+    Serial.print(pay);
+  };
+  delay( 6000 );
+}

README.md

@@ -1,3 +1,32 @@
-# CO2-Ampel-Octopus
+# CO2 Ampel mit Sensor SCD30 und Octopus als Mikrocontroller
+
+## Bauteile die benötigt werden:  
+ 
+* https://www.tindie.com/products/FabLab/iot-octopus-badge-for-iot-evaluation/
+* https://www.sensirion.com/de/umweltsensoren/kohlendioxidsensor/kohlendioxidsensoren-co2/
+* Oder https://www.seeedstudio.com/Grove-CO2-Temperature-Humidity-Sensor-SCD30-p-2911.html
+* (Optional) MQTT Broker 
+* (Optional) NodeRED auf einem Raspberry Pi oder anderen Rechner
+
+## Datenblatt für den SCD30 
+
+* https://www.mouser.de/datasheet/2/682/Sensirion_CO2_Sensors_SCD30_Datasheet-1510853.pdf
+
+## Enhalten sind in diesem Repository:
+
+*  INO-File für Ardunio IDE und zur Programmierung des Octopus
+*  NodeRED Flow zur Anzeige von CO2/Temperatur/Luftfeuchte inkl. Dashboard
+
+## Weiterführende Informationen zu dem Projekt gibt es hier:
+
+* https://www.umwelt-campus.de/forschung/projekte/iot-werkstatt/ideen-zur-corona-krise
+* WICHTIG Kalibrierung des Sensor https://www.youtube.com/watch?v=od_XsBE6hU4
+
+![Screenshot](https://git.unixweb.net/jhummel/CO2-Ampel-Octopus/raw/branch/master/images/Die-CO2-Ampel.jpg)
+
+![Screenshot](https://git.unixweb.net/jhummel/CO2-Ampel-Octopus/raw/branch/master/images/SCD30-CO2-Ampel.jpg)
+
+![Screenshot](https://git.unixweb.net/jhummel/CO2-Ampel-Octopus/raw/branch/master/images/CO2-Ampel-mit-NodeRED-Dashboard.png)
+
+
 
-CO2 Ampel mit Octopus für SCD30 Sensor

flow-Co2-Ampel.json

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