ESP32 Gateway: Plant to MQTT

MQTT firmware für lilygo higrow v1.1

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• firmware for lilygo higrow v1.1 (change pins for other versions)
• mqtt publish {temperature, humidity, soil watering, battery} every 20 minutes
• optimized for low battery consumption (should wake up ~5s * 3 every hour)

Requirenments

• DHT.h https://github.com/adafruit/DHT-sensor-library
• WiFi.h
• PubSubClient.h https://pubsubclient.knolleary.net/
• ArduinoJson.h https://arduinojson.org/?utm_source=meta&utm_medium=library.properties

Install

• Download plant_mqtt.ino
• Set wifi settings (ssid and passsword)
• Set mqtt settings (mqttServer, mqttPort, mqttUser, mqttPassword)
• Deploy to your esp32 / lilygo / ...

Node-RED and InfluxDB integration

• Install and setup default MQTT Node
• Install and setup node-red-contrib-stackhero-influxdb-v2 ( https://flows.nodered.org/node/node-red-contrib-stackhero-influxdb-v2 )
• Create custum function with content of mqtt_to_influxdb.js :

Further Improvements (maybe... maybe not):

• MQTT over TLS ( + verify certificate fingerprint )

Credits

• https://github.com/BeardedTinker/LilyGO-TTGO-HiGrow for a lot of inspiration and copied code