# 3-phase power consumption measurement

**URL:** <https://discourse.nodered.org/t/3-phase-power-consumption-measurement/68489>\
**Category:** Hardware\
**Created:** [2 October 2022 14:40 UTC](https://discourse.nodered.org/t/3-phase-power-consumption-measurement/68489 "2022-10-02T14:40:38Z")\
**Posts on this page:** 1\
**Showing post:** 206

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**Author:** ![dynamicdave](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/dynamicdave/32/96_2.png) [@dynamicdave](https://discourse.nodered.org/u/dynamicdave)\
**Post date:** [13 April 2023 08:02 UTC](https://discourse.nodered.org/t/3-phase-power-consumption-measurement/68489/206 "2023-04-13T08:02:56Z")

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Here's a link to the thread about connecting a PZEM-004T to a Wemos D1 Mini flashed with Tasmota.

> [@Need to write one function that will return 3 values](https://discourse.nodered.org/t/need-to-write-one-function-that-will-return-3-values/30931/12):
>
> This is the module I used PZEM-04 0-100A from BangGood with a serial connection to Wemos. I cut the USB connector off the end of the lead and fed the Tx and Rx signals through level shifters as the PZEM-04 used 5V logic and the Wemos is 3v3. It took quite a lot of trail-and-error to find the best pins to use on the Wemos with Tasmota. I can draw out the circuit/schematic over the weekend if you need it.

It includes one of my "rough" sketches showing the connections/diagram.

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