ESPHome SML Smart Energy Meter Reader with display
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Read your electricity meter through its infrared port — **no direct mains wiring required!** This build combines an aff
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- Creative Commons — Attribution — Noncommercial
ESPHome SML Smart Meter Reader
Read your electricity meter through its infrared port — no direct mains wiring required!
This build combines an affordable ESP32-C3 with OLED display and a BPW40 photodiode right on your meter. All values are streamed to Home Assistant in real time.
What does it do?
Reads SML data from your meter via infrared (IR) — no tapping into live wires
Shows on the tiny OLED display:
Current power (W)
Grid import total (kWh)
Grid export total (kWh)
Pushes all values over Wi-Fi to Home Assistant
Blue status LED blinks whenever data arrives
Built-in web dashboard (port 80)
OTA updates over Wi-Fi
Bill of materials (all together about 5$)
Part | Notes |
|---|---|
ESP32-C3 OLED board (ABRobot 0.42") | Includes a 72×40 SSD1306 display |
BPW40 photodiode | Receives the meter's IR signal |
1 kΩ resistor | Pull-down for the photodiode signal |
3D-printed case + magnet holder | STL files included in this project |
Neodymium magnet (5 mm ⌀ × 3 mm) | Keeps the case on the meter cover |
USB-C cable + power supply | Powers the ESP32 |
3D printable files
Two STL files are part of this release:
File | Description |
|---|---|
| Main enclosure for ESP32 and photodiode |
| Matching lid for the enclosure |
Print recommendations
Material: PLA or PETG
Layer height: 0.2 mm
Infill: 20% is sufficient
Supports: Not required
Important: The photodiode chamber must be light-tight
Tip: Depending on your printer, the diode leg holes may be tight. A 3 mm drill bit cleans them up nicely.