The water counter on ESP8266 for Arduino IDE

You may use an MQTT server to integrate into a home automation software.

A mini wifi board with 4MB flash based on ESP-8266EX - Wemos D1 mini https://www.wemos.cc/en/latest/d1/d1_mini.html

Micro SD Card Shield for Wemos D1 mini - https://www.wemos.cc/en/latest/d1_mini_shield/micro_sd.html

Added software debounce

Optional:

Lithium (LiPo) Battery shield, charging & boost for Wemos D1 mini - https://www.wemos.cc/en/latest/d1_mini_shield/battery.html

A triple(x3) Base for Wemos D1 mini - https://www.wemos.cc/en/latest/d1_mini_shield/tripler_base.html

Resistor 12kOm 0.125W for Battery shield (for external power control, see https://github.com/anyuta1166/watermeter/blob/master/doc/images/Wemos1.jpg)

Lithium (LiPo) Battery 18650 2600mAh 3.7V - https://github.com/anyuta1166/watermeter/blob/master/doc/images/battery.jpg