What is it?

A FeatherWing built around the Vangotech V9203 3-Phase Energy Monitor ASIC to measure 3-phase voltage, current and power for extra low voltage (12V AC) and current clamps.

Why did you make it?

While performing teardowns of Eastron Energy Monitors from Aliexpress I came across ASIC's from Vangotech. I wanted to try out their 3-phase offerings and sourced some sample ASIC's and this Featherwing was born. The ASIC's are hard to get from standard part sources and this Featherwing makes the evaluation easy.

What makes it special?

This Energy monitor can perform 3-phase measurements from 12V AC transformers and uses a very accurate V9203 ASIC. This ASIC is hard to get outside of China, PCBWay has sourced this from the manufacturer directly. The FeatherWing also features high efficiency 5v buck converter for powering the Feather and a very robust molex nanofit connector for connecting current clamps. A single unit is available with an RJ45 connector as well (pictured).

The Featherwing is well supported with an Arduino Driver , though more work on supporting the software layer is appreciated. Discount coupons for my store will be made available to code contributors.