fliphess / esp8266_p1meter

dsmr 4.2 P1 meter to mqtt using esp8266 nodemcu

esp8266_p1meter

Software for the ESP2866 that sends P1 smart meter data to an mqtt broker (with OTA firmware updates)

08-05-2021: I've not used this sketch myself for several years now and as such it became a bit outdated: It supports only older meters with version 2.2 and 2.0 and the development has halted. I recommend people with newer meters to have a look at this fork instead.

Connection of the P1 meter to the ESP8266

ESP8266 Pin	P1 Pin
GND	GND
3V3	RTS
DATA (RXD)	D2

To connect my Landys and Gyr E350 (ZCF110), I used a 10K resistor connected between DATA (RXD) and RTS. Many howto's mention RTS requires 5V (VIN) to activate the P1 port, but for me 3V3 suffices.

Data Sent

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

sensors/power/p1meter/consumption_low_tarif 2209397
sensors/power/p1meter/consumption_high_tarif 1964962
sensors/power/p1meter/actual_consumption 313
sensors/power/p1meter/instant_power_usage 313
sensors/power/p1meter/instant_power_current 1000
sensors/power/p1meter/gas_meter_m3 968922
sensors/power/p1meter/actual_tarif_group 2
sensors/power/p1meter/short_power_outages 3
sensors/power/p1meter/long_power_outages 1
sensors/power/p1meter/short_power_drops 0
sensors/power/p1meter/short_power_peaks 0

As I don't have solar panels (yet) I do not collect the data for power returns as I don't have any. They are however easy to add if you know the codes used.

Home Assistant Configuration

I use this for home assistant sensors.yaml:

- platform: mqtt
  name: P1 Consumption Low Tarif
  unit_of_measurement: 'kWh'
  state_topic: "sensors/power/p1meter/consumption_low_tarif"
  value_template: "{{ value|float / 1000 }}"

- platform: mqtt
  name: P1 Consumption High Tarif
  unit_of_measurement: 'kWh'
  state_topic: "sensors/power/p1meter/consumption_high_tarif"
  value_template: "{{ value|float / 1000 }}"

- platform: mqtt
  name: P1 Actual Power Consumption
  unit_of_measurement: 'kW'
  state_topic: "sensors/power/p1meter/actual_consumption"
  value_template: "{{ value|float / 1000 }}"

- platform: mqtt
  name: P1 Instant Power Usage
  unit_of_measurement: 'kW'
  state_topic: "sensors/power/p1meter/instant_power_usage"
  value_template: "{{ value|float / 1000 }}"

- platform: mqtt
  name: P1 Instant Power Current
  unit_of_measurement: 'A'
  state_topic: "sensors/power/p1meter/instant_power_current"
  value_template: "{{ value|float / 1000 }}"

- platform: mqtt
  name: P1 Gas Usage
  unit_of_measurement: 'm3'
  state_topic: "sensors/power/p1meter/gas_meter_m3"
  value_template: "{{ value|float / 1000 }}"

- platform: mqtt
  name: P1 Actual Tarif Group
  state_topic: "sensors/power/p1meter/actual_tarif_group"

- platform: mqtt
  name: P1 Short Power Outages
  state_topic: "sensors/power/p1meter/short_power_outages"

- platform: mqtt
  name: P1 Long Power Outages
  state_topic: "sensors/power/p1meter/long_power_outages"

- platform: mqtt
  name: P1 Short Power Drops
  state_topic: "sensors/power/p1meter/short_power_drops"

- platform: mqtt
  name: P1 Short Power Peaks
  state_topic: "sensors/power/p1meter/short_power_peaks"

The automations 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:

• https://github.com/jantenhove/P1-Meter-ESP8266
• https://github.com/neographikal/P1-Meter-ESP8266-MQTT
• http://gejanssen.com/howto/Slimme-meter-uitlezen/
• https://github.com/rroethof/p1reader/
• http://romix.macuser.nl/software.html
• http://blog.regout.info/category/slimmeter/
• http://domoticx.com/p1-poort-slimme-meter-hardware/