signalk-pzem017

ESP8266 reading Peacefair PZEM-017 values over ModbusRTU and passing date to SignalK server.

Voltage and current sensor based on Peacefair PZEM-017 with 200A/75mV shunt. The sensor can be ordered e.g. from AliExpress.

Libraries Used

• PlatformIO
• modbus-esp8266
• EspSoftwareSerial
• EspSigK

Equipment

• Wemos D1 ESP8266
• Peacefair PZEM-017
• 200A/75mV shunt
• MAX3485
• 120 ohm resistor

Wiring

Power Connector (two pins):

1. 5V DC for ESP8266 (red)
2. GND DC for ESP8266 (black)

Modbus Connector (four pins):

1. Modbus 5V DC (red)
2. Modbus A (striped blue)
3. Modbus B (striped yellow)
4. Modbus GND (black)

PCB

• Fritzing file

Configuration

• Copy template file lib/settings.cpp.sample as lib/settings.cpp
• Edit according to your environment
• make upload

OTA update

To enable OTA update set OTA password (variable otaPass in settings.cpp) to non-empty string.

To update image using PlatformIO pio tool:

PLATFORMIO_UPLOAD_FLAGS="--auth=ota-password" pio run -t upload --upload-port device.ip.address

Or with zeroconf address (hostname is your wifiHostname defined in settings.cpp):

PLATFORMIO_UPLOAD_FLAGS="--auth=ota-password" pio run -t upload --upload-port hostname.local