a diagram of a digital electronic water meter?

I want to implement the electronic water meter digital cirsuit

I do not think you will find a circuit diagram for a digital water (liquid) meters so easily. But let's look at what must produce: 1) a flow sensor (a "turbine" pulse outputs of the wheel), difficult to build reliable by itself …. 2) A meter, see http://www.kpsec.freeuk.com/counting.htm 3) A display and driver. If you want to buy a complete electronic flow meter, as http://www.rittenhouse.ca/asp/product.asp?PG=1553 or more "professional" and master_cat_id http://www.flowmeters.com/products/index.cfm?task=cat_prod_page&master = Yes = 29 & cat = yes & cat_id = 163 # 29_163

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