wateringsystem controller 2.0 with ESP32

Description

This controller is the heart of my new wateringsystem.

Features

• Monitoring weather data (temperature, humidity and air pressure)
• Monitoring th soil moisture of the plant
• Monitoring of energy consumption
• super long deepsleep times to save energy
• easy to configurable with the help of Node-RED
• Controllable via MQTT
• widely-used sensors
• completly asynchron programming
• host by your own: complete control over your data (no external cloud service needed)
• OTA updates

Setup

• connect all parts to the ESP32
• connect power
• the ESP32 starting an own Wifi access point named "wateringsystem-{device ID}"
• connect to this Wifi with your smartphone
• use waaatering for Wifi password
• you will redirected to a config page
• insert your Wifi and MQTT broker credentials
• click on "save"
• the ESP32 will restarting and connect to your MQTT broker
• after about 1 minute you should see a new topic in your MQTT broker wateringsystem/{device ID}/out/info with a lot of information in the payload

MQTT API

The whole module is controllable via MQTT protocol. So it's easy to integrate in existing SmartHome systems (like Home Assistant or Node-Red).

Incoming commands

Topic: wateringsystem/{device ID}/in/{command}

command	description	payload
watering	Start watering for specific duration (in milliseconds!)	{ duration: number }
abort-watering	Abort watering before timer ends	-
sleep	Start deep-sleep for specific duration (in milliseconds!)	{ duration: number }
info	Send info via MQTT topic wateringsystem/out/info package	-
hard-reset	Reset config with WiFi and MQTT settings and start internal hotspot to reconfigure device.	-

Outcoming commands

Topic: wateringsystem/{device ID}/out/{command}

command	description	payload
info	status info	complex JSON. See "info-state" chapter
sleep	was send if sytem enter deep-sleep	{ duration: number }
wakeup	was send if sytem wakeup from deep-sleep	reason "timer"

Info state

field	description	type
version	version number of module firmware	string
soilMoisture	analog value of soil-moisture sensor	number
system.deviceId	Unique ID of the device. Will used also in MQTT topics.	string
system.freeHeap	free heap memory of CPU	number
energy.shuntVoltage	voltage between V- and V+ (in mV)	number
energy.busVoltage	voltage of power input pin (in V) (optimal value between 3.6 and 4.0)	number
energy.current	current (in mA)	number
energy.power	energy consumption (in mW)	number
energy.loadVoltage	load voltage (in V)	number
network.wifiRssi	wifi signal strength (RSSI)	number
network.wifiQuality	quality of signal strength (value between 0 and 100%)	number
network.wifiSsid	SSID of connected wifi	string
network.ip	ip address of the module	string

Sketch

TODOs

• buy sensor and ESP32
• soldering first prototype of the sketch
• test firmware
• test OTA updates
• create housing (3D print)
• create example flow with Node-RED
• add part list
• add video doc
• add WifiManager to easy setup