Electronic Digital

a schematic of an electronic digital water meter?

I want to implement the cirsuit of the electronic digital water meter

I don’t think you will find a circuit diagram for a digital water (fluid) meter so easily. But let’s analyze what you need to build one:
1) A flow sensor (a “turbine” wheel that outputs pulses), tricky to build a reliable one by yourself….
2) A counter, see http://www.kpsec.freeuk.com/counting.htm
3) A display, and its driver.
Unless you want to buy a complete electronic flow meter, like http://www.rittenhouse.ca/asp/product.asp?PG=1553
or more “professional”,

http://www.flowmeters.com/products/index.cfm?task=cat_prod_page&master=yes&master_cat_id=29&cat=yes&cat_id=163#29_163

The Atanasoff-Berry Computer In Operation

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