Grüner Daumen dank Technologie: Wie NodeRed, MQTT, Awtrix und der Pflanzenwächter das Pflanzenleben retten

Meine Holde liebt Pflanzen, noch und nöcher. Wir haben einige Exemplare der Gattung „Gestrüpp“, wie ich es gerne nenne, in unserer Wohnung stehen doch leider vergisst sie gerne mal das Gießen.
Das rief mich auf den Plan und ich machte mir ein paar Gedanken darüber.
Ein Bodenfeuchte-Sensor musste her doch wie sollte die Benachrichtigung von statten gehen? Per Handy? WhatsApp sogar? Nein, ich entschied mich für einen anderen Weg. Da ich ein Home Assistant System am laufen habe, eine Awtrix und mehrere Alexas…Alexen… ach egal, kam ich auf die Idee den Pflanzenwächter, wie ich ihn nenne, mit diesen Dingen zu verknüpfen.

Was benötigst du um das ganze nachzubauen?

Wemos D1 mini
TP4056
18650 Akkuhalter und Akku
Kapazitiven Bodenfeuchte Sensor
Bei Bedarf ein gedrucktes Gehäuse

Das Ganze wird nach folgendem Schemata zusammengeklöppelt:

In der Realität sieht das ganze so bei mir aus:

Als Code habe ich den von der Seite: https://diyi0t.com/soil-moisture-sensor-tutorial-for-arduino-and-esp8266/ verwendet. Warum das Rad nochmal neu erfinden 😉

#include "ESP8266WiFi.h" // Enables the ESP8266 to connect to the local network (via WiFi)
#include "PubSubClient.h" // Allows us to connect to, and publish to the MQTT broker

#define SensorPin A0 

// WiFi
const char* ssid = "KabelBox-0174";
const char* wifi_password = "943476385562******";

// MQTT
// Make sure to update this for your own MQTT Broker!
const char* mqtt_server = "192.168.0.8";
const char* plant_topic = "plant";
const char* mqtt_username = "cdavid";
const char* mqtt_password = "cdavid";
// The client id identifies the ESP8266 device. Think of it a bit like a hostname (Or just a name, like Greg).
const char* clientID = "client_plant_test";


// Initialise the WiFi and MQTT Client objects
WiFiClient wifiClient;
PubSubClient client(mqtt_server, 1883, wifiClient); // 1883 is the listener port for the Broker


void connect_MQTT(){
  Serial.print("Connecting to ");
  Serial.println(ssid);

  // Connect to the WiFi
  WiFi.begin(ssid, wifi_password);

  // Wait until the connection has been confirmed before continuing
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  // Debugging - Output the IP Address of the ESP8266
  Serial.println("WiFi connected");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

  // Connect to MQTT Broker
  // client.connect returns a boolean value to let us know if the connection was successful.
  // If the connection is failing, make sure you are using the correct MQTT Username and Password (Setup Earlier in the Instructable)
  if (client.connect(clientID, mqtt_username, mqtt_password)) {
    Serial.println("Connected to MQTT Broker!");
  }
  else {
    Serial.println("Connection to MQTT Broker failed...");
  }
}


void setup() { 
  Serial.begin(9600);
  connect_MQTT();
  Serial.setTimeout(2000);

  float sensorValue = analogRead(SensorPin);
  Serial.println(sensorValue);

  // PUBLISH to the MQTT Broker
  if (client.publish(plant_topic, String(sensorValue).c_str())) {
    Serial.println("Moisture sent!");
    Serial.println(plant_topic);
  }
  // Again, client.publish will return a boolean value depending on whether it succeded or not.
  // If the message failed to send, we will try again, as the connection may have broken.
  else {
    Serial.println("Moisture failed to send. Reconnecting to MQTT Broker and trying again");
    client.connect(clientID, mqtt_username, mqtt_password);
    delay(10); // This delay ensures that client.publish doesn't clash with the client.connect call
    client.publish(plant_topic, String(sensorValue).c_str());
  }
  
  delay(1000);
  ESP.deepSleep(0.2*60e6);
}

void loop() {
}

Achtet darauf das ihr als MQTT-Server eure Daten eintragt und das, wenn der Code so übernommen wird, euer Wemos nur alle Stunde aufwacht.

Mein NodeRed Flow sieht so aus:

Und hier der Flow zum Importieren:

[{"id":"cc5b01a60ddd89af","type":"alexa-remote-routine","z":"dc90222c4b9124e8","name":"","account":"0e787775aee37eea","routineNode":{"type":"speak","payload":{"type":"regular","text":{"type":"str","value":"die palme muss gegossen werden"},"devices":["G090XG06924102H5"]}},"x":1280,"y":400,"wires":[[]]},{"id":"cacdd34665d1312e","type":"delay","z":"dc90222c4b9124e8","name":"","pauseType":"delay","timeout":"5","timeoutUnits":"seconds","rate":"1","nbRateUnits":"1","rateUnits":"second","randomFirst":"1","randomLast":"5","randomUnits":"seconds","drop":false,"allowrate":false,"outputs":1,"x":1020,"y":400,"wires":[["cc5b01a60ddd89af"]]},{"id":"44d39ad607b7cdf2","type":"time-range-switch","z":"dc90222c4b9124e8","name":"","lat":"","lon":"","startTime":"10:00","endTime":"21:00","startOffset":0,"endOffset":0,"x":770,"y":400,"wires":[["cacdd34665d1312e"],[]]},{"id":"a8ae512013d957dd","type":"function","z":"dc90222c4b9124e8","name":"function 3","func":"msg.payload = { \"name\": \"test\", \"force\": true, \"icon\": 909, \"text\":\"Die Palme muss gegossen werden\", \"color\": [51, 204, 51] };\nmsg.headers = { \"content-type\": \"application/json\" };\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":560,"y":420,"wires":[["44d39ad607b7cdf2","9299b4670246e0a8"]]},{"id":"ccfa1653b9909d9b","type":"function","z":"dc90222c4b9124e8","name":"function 4","func":"msg.payload = { \"name\": \"test\", \"force\": true, \"icon\": 909, \"text\":\"Die Palme hat genug Wasser\", \"color\": [51, 204, 51] };\nmsg.headers = { \"content-type\": \"application/json\" };\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":560,"y":540,"wires":[["9299b4670246e0a8"]]},{"id":"9299b4670246e0a8","type":"mqtt out","z":"dc90222c4b9124e8","name":"","topic":"awtrix/notify","qos":"","retain":"","respTopic":"","contentType":"","userProps":"","correl":"","expiry":"","broker":"a457f1fd2ae80ec8","x":770,"y":600,"wires":[]},{"id":"36572a998b542371","type":"mqtt in","z":"dc90222c4b9124e8","name":"","topic":"plant","qos":"2","datatype":"auto-detect","broker":"a457f1fd2ae80ec8","nl":false,"rap":true,"rh":0,"inputs":0,"x":150,"y":460,"wires":[["389a6da9a7352d4b","0956848d25333157"]]},{"id":"389a6da9a7352d4b","type":"switch","z":"dc90222c4b9124e8","name":"","property":"payload","propertyType":"msg","rules":[{"t":"gte","v":"450","vt":"str"},{"t":"lt","v":"449","vt":"str"}],"checkall":"true","repair":false,"outputs":2,"x":310,"y":460,"wires":[["a8ae512013d957dd"],["ccfa1653b9909d9b"]]},{"id":"0956848d25333157","type":"ha-sensor","z":"dc90222c4b9124e8","name":"","entityConfig":"994cbe9a7979d880","version":0,"state":"payload","stateType":"msg","attributes":[],"inputOverride":"allow","outputProperties":[],"x":310,"y":540,"wires":[[]]},{"id":"0e787775aee37eea","type":"alexa-remote-account","name":"Alexa","authMethod":"proxy","proxyOwnIp":"192.168.1.110","proxyPort":"3456","cookieFile":"authFile1","refreshInterval":"10","alexaServiceHost":"layla.amazon.de","amazonPage":"amazon.de","acceptLanguage":"de-DE","onKeywordInLanguage":"on","userAgent":"","useWsMqtt":"on","autoInit":"off"},{"id":"a457f1fd2ae80ec8","type":"mqtt-broker","name":"awtrix","broker":"192.168.1.110","port":"1883","clientid":"","autoConnect":true,"usetls":false,"protocolVersion":"3","keepalive":"60","cleansession":true,"birthTopic":"","birthQos":"0","birthPayload":"","birthMsg":{},"closeTopic":"","closeQos":"0","closePayload":"","closeMsg":{},"willTopic":"","willQos":"0","willPayload":"","willMsg":{},"userProps":"","sessionExpiry":""},{"id":"994cbe9a7979d880","type":"ha-entity-config","server":"1b6d8224.9376fe","deviceConfig":"dbd4c679ca923095","name":"","version":"6","entityType":"sensor","haConfig":[{"property":"name","value":"Palme"},{"property":"icon","value":""},{"property":"entity_category","value":""},{"property":"entity_picture","value":""},{"property":"device_class","value":"moisture"},{"property":"unit_of_measurement","value":"%"},{"property":"state_class","value":""}],"resend":false,"debugEnabled":false},{"id":"1b6d8224.9376fe","type":"server","name":"Home Assistant","addon":true,"rejectUnauthorizedCerts":true,"ha_boolean":"","connectionDelay":false,"cacheJson":true,"heartbeat":false,"heartbeatInterval":"","areaSelector":"friendlyName","deviceSelector":"friendlyName","entitySelector":"friendlyName","statusSeparator":"","enableGlobalContextStore":false},{"id":"dbd4c679ca923095","type":"ha-device-config","name":"","hwVersion":"","manufacturer":"Node-RED","model":"","swVersion":""}]

Hier solltet ihr darauf achten das beim MQTT-Node Eure Daten eingetragen werden.

Ihr bekommt jetzt, jede Stunde, eine Nachricht auf eure Awtrix gesendet und stündlich, zwischen 10:00 und 21:00 Uhr eine Erinnerung auf eure Alexa sofern eure Pflanze zu trocken ist.
Die Daten im Switch-Node sind erst einmal experimentell und ihr müsst austesten wann eure Pflanze zu trocken ist.
Sollte sie genug gegossen sein bekommt ihr auch eine Nachricht auf die Awtrix.

Ich hoffe ich konnte so ein Problem für euch lösen, Uns hat es sehr weitergeholfen.
Achso, wie lange der Akku im Betrieb hält habe ich noch nicht ausgetestet. Wird aber nachgeholt und hier mitgeteilt.

Viel Spaß beim Basteln.

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