# PowerMeter This repository holds a PZEM-004T and ESP8266 based power/energy meter. More information at: https://primalcortex.wordpress.com/2019/07/06/measuring-home-energy-consumption-with-the-pzem004t-and-esp8266/. Note that the master branch is for use with the PZEM-004T Version 2.0 that uses standard serial communications. The Version 3.0 uses modbus which does not work with this version. The repository structure is as follows: The *PowerMeter* repository/folder contains the firmware for an ESP8266 and PZEM-004T based power/energy meter. This is the firmware that should be used to have a full functional ESP8266 based powermeter. The PowerMeter is designed to use Wemos D1 ESP8266 boards. The *PZEM004T-Test* repository contains a simple program for testing the ESP8266 to PZEM004 communications and the retrieving of data from the PZEM004T. The *Node-Red* folder contains a flow that receives published telemetry data from the Power Meter, saves it on an InfluxDB database and creates a Node-Red Dashboard UI to show the latest collected data. The *Grafana* folder contains a very simple grafana dashboard that retrieves data from the InfluxDB database and displays it. It's a no frills dashboard... # Screenshots: Some screenshots of the PowerMeter working: *ESP8266 based Power Meter Web Interface:*  *The Node-Red UI:*  *The simple Grafana dashboard:*