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Build a simple MQTT battery monitor device.
Wifi Controller - geni.us/wemos1min (Amazon)
Used an ESP8266 Wemos d1 mini, a power shield and some resistors to remotely monitor my car battery and send the readings to Home Assistant (or any other home automation platform that supports MQTT).
Buy the components
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╚═ Wifi Controller
■ geni.us/wemos1min (Amazon)
■ s.click.aliexpress.com/e/_Af36zD (AliExpress)
╚═ Power Shield
■ geni.us/uO30 (Amazon)
■ s.click.aliexpress.com/e/_A2Tnkg (AliExpress)
Schematics and Code
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www.instructables.com/id/DIY-...
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