mqtt-watermeter

Combining Mysensors Water Meter Pulse Sensor[link] with GoodWeLogger[link] to create a watermeter that sends its data over MQTT.

For example to use with Hass.io [link]

Requirements

• ESP8266 (Wemos/LOLIN D1 mini)
• TCRT5000 IR module
• Basic soldering and wiring skills
• (For Wemos d1 mini) CH340G driver [link]

Arduino IDE

• Add boards Preferences -> Additional Board Manager URLs Add http://arduino.esp8266.com/stable/package_esp8266com_index.json Than install wemos boards (esp8266 by ESP8266 Community) tools -> board -> boards manager
• Install lib pubsubclient[link]

Connection scheme

ESP8266	TCRT5000
3.3v	VCC
GND	GND
RX	D0

Installation

Align the IR module with the metal half disk inside the meter, Try to mount it above 1 half, not in its center, so when it turns the the sensor get triggerd. Adjust the trimpot so it just triggered when the disk is underneath.

Settings

Copy Settings.example.h to Settings.h and fill in the correct data.

Setting	default	Description
WIFI_HOSTNAME	WaterMeterPuls	device name on network
WIFI_SSID	-	Wifi name to connect to
WIFI_PASSWORD	-	Wifi password
MQTT_HOST_NAME	-	MQTT broker address
MQTT_PORT	1833	MQTT broker port
MQTT_USER_NAME	-	MQTT user name
MQTT_PASS	-	MQTT password
MQTT_QUICK_UPDATE_INTERVAL	1000	(?) Send interval (ms)
MQTT_REGULAR_UPDATE_INT	10000	(?) Send interval (ms)
MQTT_TOPIC	watermeter	MQTT topic prefix
DATA_PIN	3	Pin of IR module D0
PULSE_FACTOR	1000	Number of blinks per m3 of your meter (One rotation/liter)
MAX_FLOW	40	Max flow (l/min) value to report. This filters outliers
SEND_FREQUENCY	3000	Time (ms) between posts
DEBUGE_MODE	true	debug mode

MQTT

Subscribe to watermeter/<topic> in your MQTT client. prefix can be changes in the settings.

Topic	Description	Unit
vol	total m3 since reboot	m3
puls	total pulses since reboot	int
flow	water flow in l/min	l/min

Example:

watermeter/vol:  0.005
watermeter/puls: 76
watermeter/flow: 37.0425