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Magnetic Smart Meter readinghead for phototransistor (SML -> ESPHome, Volkszaehler etc.)

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Speeter

@Speeter_1185247

An elegant way to make a smart meter actually smart for <5€

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Updated at source: Jul 23, 2026

Model information

Source: Printables
Category: Other House Equipment
License: Creative Commons — Attribution — Share Alike

Details Files (1)Makes & comments (Makes: 0) (Comments: 0)Remixes (0)Collections (1)

Simply add a magnet and electronics and start reading data from your power meter!

Kompatibel mit den in Deutschland verbreiteten Smart Metern. Eignet sich z.b. für die Nutzung mit ESPHome + Homeassistant mittels eines ESP8266/ESP32 und einem einfachen Fototransistor. (Hardwarekosten insgesamt < 5€ incl. ESP) Dokumentation dazu hier

Beispielcode ESPHome:

uart:
 - id: uart_bus1
   rx_pin: GPIO3
   baud_rate: 9600
   data_bits: 8
   parity: NONE
   stop_bits: 1sml:

id: sml1
uart_id: uart_bus1

sensor:

platform: sml
name: "1.8.0"
sml_id: sml1
obis_code: "1-0:1.8.0"
unit_of_measurement: kWh
accuracy_decimals: 3
device_class: energy
state_class: total_increasing
filters:
multiply: 0.0001
throttle: 15s


platform: sml
name: "2.8.0"
sml_id: sml1
obis_code: "1-0:2.8.0"
unit_of_measurement: kWh
accuracy_decimals: 3
device_class: energy
state_class: total_increasing
filters:
multiply: "0.0001"
throttle: 15s


platform: sml
name: "power"
sml_id: sml1
obis_code: "1-0:16.7.0"
unit_of_measurement: W
accuracy_decimals: 2
device_class: power
state_class: measurement
filters:
throttle_average: 5s

Magnetic Smart Meter readinghead for phototransistor (SML -> ESPHome, Volkszaehler etc.)

Model information

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