The PZEM-004T is a module designed for measuring voltage, current, power, energy and frequency in AC electrical systems. It can communicate with a microcontroller or computer via RS485 or UART interface and it can also be connected to a power meter.

The module can be used to monitor the power consumption of appliances and other electrical devices, and can also be used to measure the performance of solar panels and other renewable energy systems. It is widely used in smart home, industrial control, power metering and other fields.

In this project I built a wireless energy monitor system designed around a Texas Instruments CC2652RB ZigBee module running the PTVO custom firmware. It has been running for more that a year in my home and proved to be very reliable and accurate. I got practically the exact same energy consumption reading than was in my electricity bill.

Check out my blog article for a detailed explaination and pictures

https://csrlabs.io/diy-zigbee-energy-monitor-based-on-pzem-004t.html