All you need is a printed shell, a Wemos-compatible development board with an ESP32 MCU, an optical interface board, and a few small parts like a ring magnet ... meter adapter added to your smart ...

His meter might not have an LED, but it did have a magnet attached to the counter disk which activated an internal hall sensor. With some hacking, he was able to attach an external Hall-effect ...

This is the second part of a three-part series on the topic of smart meters and wireless technology. Last week we looked at ...