Modifying the Peacefair PZEM-004T AC Comms Module (with schematic)

The PZEM004T module is a mains powered module that measures voltage, current, power factor, apparent power and frequency. It has no display but provides these values over a serial interface. In this video, I am going to modify it to measure from 0 volts AC onwards and in a second step to take its operating power from the serial port. This makes using the module much simpler.
There will be a follow-on video, about accuracy and using the software I wrote to use the module.

00:00 the PZEM-004T
01:38 specs
02:52 serial protocol
03:52 wiring diagram
04:49 current transformer
05:16 interface cable
06:23 the PCB
07:49 V9881D chip
09:13 schematic & function
13:45 modification options
14:59 measure from 0V
19:36 ..and power from serial
25:07 modified PCB complete

The x1 / x10 feature is explained here: https://youtu.be/Pb9Fp5J7lTI
The schematics and software is here: https://github.com/TheHWcave/Peacefair-PZEM-004T-

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Видео Modifying the Peacefair PZEM-004T AC Comms Module (with schematic) канала TheHWcave