BoardPilotPZEM-004T v3 AC energy meter (UART) with ESP32
Supply 5 V
Bus GPIO
Measures voltage, current, power, energy, frequency, power factor
Pins and ESP32 wiring
| Pin | Role | ESP32 pin | Notes |
|---|---|---|---|
| 5V | Power | VIN | TTL side supply. Isolated from mains by optocouplers |
| RX | Input (the ESP32 drives it) | D25 | UART: the meter receives data here. Connect to an ESP32 TX pin (9600 baud, Modbus RTU) |
| TX | Output (the part drives it) | D26 | UART: the meter sends here. Idles at the 5 V supply: add a divider before the ESP32 RX pin |
| GND | Ground | GND | |
| L | Not wired to the ESP32 | — | MAINS 230 V! Only a qualified person connects this. Never to the ESP32 |
| N | Not wired to the ESP32 | — | MAINS 230 V! Only a qualified person connects this. Never to the ESP32 |
| CT+ | Not wired to the ESP32 | — | Current transformer lead (100 A version). The measured wire passes through the CT |
| CT- | Not wired to the ESP32 | — | Current transformer lead (100 A version) |
Suggested wiring for the 30-pin ESP32 DevKit, avoiding flash, input-only and strapping pins. BoardPilot checks it for you as you wire.
This module is sold for 5 V. Its outputs may be 5 V: use a level shifter or a voltage divider on ESP32 inputs.
Sources
- Peacefair PZEM-004T V3.0 user manual, Measures voltage 80 to 260 V, current, power, energy, frequency, power factor
- Peacefair PZEM-004T V3.0 user manual, TTL serial 9600 baud, Modbus-RTU; TTL side powered with 5 V
Try it in 3D in BoardPilot
Learn the basics
Lesson: UART, I2C and SPI Lesson: GPIO: pins in and out Lesson: Hardware basics for software developers UART (serial port) Baud rate GPIO Level shifter Logic level (HIGH and LOW)
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Part data: CC BY 4.0, free to reuse with credit to BoardPilot.