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Car battery voltage monitor by ESP8266 and email ? Answered

I see there a lot of nice ESP8266 projects around that report stuff via email or SMS, but has anyone seen one that can monitor a cars battery voltage periodically (say twice a day) and report when it gets below 12.0V ?
The purpose would be to keep an eye on batteries of cars in storage, or cars in extreme winter conditions, and report a warning on email if it's low via a home WiFi network.

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