esp8266_p1meter

Software for the ESP8266 that sends P1 smart meter data to an mqtt broker (with OTA firmware updates)

about this fork

This fork adds support for the Landys and Gyr E360 smartmeter in Sweden. The P1 Port is called in nordic countries HAN-Port H1 which provides different values compared to the Dutch standard ESMR 5.0

The has issues with DSMR5.0 meters who like to send telegrams every 1 second at a high 115200 baud rate. This causes the used SoftwareSerial to struggle to keep up and thus only receives corrupted messages. This fork switches to using the main Hardware serial port (RX) for communication with the meter.

Getting started

This setup requires:

An esp8266 (nodeMcu and Wemos d1 mini have been tested)
A 10k ohm resistor
A 4 pin RJ11 or 6 pin RJ12 cable Both cables work great, but a 6 pin cable can also power the esp8266 on most DSMR5+ meters.

Compiling up using Arduino IDE:

Ensure you have selected the right board
Using the Tools->Manage Libraries... install PubSubClient and WifiManager
In the file Settings.h change OTA_PASSWORD to a safe secret value
Flash the software

Compiling up using PlatformIO:

Ensure the correct board type is selected in project configuration
In the file Settings.h change OTA_PASSWORD to a safe secret value
Upload the software.

Finishing off:

You should now see a new wifi network ESP****** connect to this wifi network, a popup should appear, else manually navigate to 192.168.4.1
Configure your wifi and Mqtt settings
To check if everything is up and running you can listen to the MQTT topic hass/status, on startup a single message is sent.

Connecting to the P1 meter

Connect the esp8266 to an RJ11 cable/connector following the diagram.

P1 pin	ESP8266 Pin
2 - RTS	3.3v
3 - GND	GND
4 -
5 - RXD (data)	RX (gpio3)

On most Landys and Gyr models a 10K resistor should be used between the ESP's 3.3v and the p1's DATA (RXD) pin. Many howto's mention RTS requires 5V (VIN) to activate the P1 port, but for me 3V3 suffices.

Optional: Powering the esp8266 using your DSMR5+ meter

Expand to see wiring description

When using a 6 pin cable you can use the power source provided by the meter.

P1 pin	ESP8266 Pin
1 - 5v out	5v or Vin
2 - RTS	3.3v
3 - GND	GND
4 -
5 - RXD (data)	RX (gpio3)
6 - GND	GND

Data Sent

All metrics are send to their own MQTT topic. The software sends out to the following MQTT topics:

sensors/power/p1meter/consumption

Home Assistant Configuration

Use the p1_sensors_sv.yaml for Home Assistant integration

The automatons are yours to create. And always remember that sending alerts in case of a power outtage only make sense when you own a UPS battery :)

Thanks to

This sketch is mostly copied and pasted from several other projects. Standing on the heads of giants, big thanks and great respect to the writers and/or creators of:

UdoK/esp8266_p1meter_sv