Read Your Smart Meter with an optical port
Do you have a smart meter without a P1 port, or want to read an additional water or energy meter that only has an optical interface? The new Smart Gateways IEC 62056‑21 TTL Infrared Optical Read Head provides a powerful and flexible solution for energy enthusiasts, tweakers, and home automation professionals.
This read head is specifically designed for direct connection to microcontrollers such as the ESP32 or ESP8266, and integrates seamlessly with platforms like ESPHome and Home Assistant, delivering reliable real-time meter data without the need for USB adapters or extra drivers.
What is it exactly?
The IEC 62056‑21 TTL Infrared Optical Read Head is an advanced hardware interface that captures real-time data from your smart meter via UART TTL communication (3.3V). With the included RJ12 cable and magnetic mounting, it connects easily to your meter, making it perfect for long-term, reliable meter reading.
Key Features:
- Direct RX/TX connection for stable TTL communication
- Clear status LEDs (TX and RX) for instant feedback
- RJ12 connector with fixed pinout for hassle-free wiring
- Strong magnetic mounting for secure placement
- Compatible with ESPHome, Home Assistant, and other home automation platforms
The Ultimate Companion for ESPHome & Home Assistant
In home automation, stability and real-time data are everything. While USB-based read heads often require drivers and additional hardware (like a Raspberry Pi), our TTL-based optical probe works directly at the source.
- ESPHome & Home Assistant: Connect the read head to an ESP32 and stream your meter readings live to Home Assistant via WiFi or Ethernet, for accurate, real-time energy monitoring.
- Domoticz: Integrate the hardware into your existing system for precise logging of energy and water consumption.
- Direct ESP32 Connection: The read head communicates via RX/TX TTL (3.3V), avoiding USB instability or extra power usage from converters. Simply connect the probe directly to the pins of your ESP32 development board for reliable, plug-and-play integration.
Why Choose This Smart Meter Probe?
At Smart Gateways, we understand what makes a sensor reliable for years of trouble-free operation in your meter cabinet:
- Strong Magnetic Mounting: The read head features a powerful magnet. Simply attach it to the optical interface of your meter, and it stays securely in place for accurate, uninterrupted readings.
- Direct Status LEDs: No guessing if it’s working. The built-in green (TX) and white (RX) LEDs provide real-time feedback of data being exchanged between your meter and controller.
- Easy Installation: The included 50 cm RJ12 cable comes with a standard connector and clear color-coded wiring, making setup quick and error-free.
Technical Details (For Builders & Tweakers)
The IEC 62056‑21 TTL Infrared Optical Read Head is compatible with almost all meters that follow the international IEC 62056‑21 standard (formerly IEC 1107).
| Feature | Specification |
|---|---|
| Communication | UART TTL (3.3V) – ideal for ESP32/ESP8266 |
| Protocol | Supports IEC 62056‑21 & DLMS/COSEM |
| Mounting | Integrated N38 magnet for secure attachment |
| Feedback | Status LEDs (Transmit / Receive) |
| Cable | 4-wire RJ12 cable (50 cm) included |
Compatible with meters from brands such as:
- Landis+Gyr
- Iskraemeco
- Elster / Honeywell
- Sagemcom
Important Notice:
Before purchasing, make sure your smart meter can be read via an optical interface. Some meters may have the optical port disabled, or the IEC 62056‑21 standard may be implemented differently. This product provides hardware only — no software is included.
For examples of how to use this read head, refer to our guide and configuration examples on Github: ESPHome IEC 62056‑21 TTL Probe Guide
How to Connect It
Connecting the read head to an ESP32 or similar microcontroller is simple and straightforward thanks to the color-coded RJ12 cable:
- Red: 3.3V Power
- Black: GND (Ground)
- Yellow: RX (connect to TX on your ESP)
- Green: TX (connect to RX on your ESP)
Important Notice:
This product is hardware only — it functions as a smart meter interface. To read energy or consumption data, you need additional software, such as an ESP32 development board with ESPHome, or your own custom script. No software is included.
Thanks to the direct TTL (3.3V) connection, integration with Home Assistant, ESPHome, or other home automation platforms is simple, stable, and reliable, providing real-time energy data without the complications of USB converters or drivers.
For a practical ESPHome example and configuration guide for the IEC 62056‑21 TTL Optical Read Head, see: ESPHome Guide for TTL Optical Probe
Conclusion: The Missing Link in Your Energy Monitoring
With the Smart Gateways IEC 62056‑21 TTL Infrared Optical Read Head, you can finally access the meter data that was previously unreachable. Whether you have a smart meter without a P1 port or want to monitor an additional water or energy meter, this optical read head provides the most stable bridge between your meter and your dashboard.
By focusing on direct TTL communication and full compatibility with ESPHome, Home Assistant, and Domoticz, this product delivers exactly what smart home enthusiasts and IoT developers need: complete control, without relying on cloud solutions or unstable USB converters. The strong magnet and clear status LEDs make installation robust and foolproof.
In short: Stop guessing and start measuring. This optical read head is the reliable, professional, and smart choice for every modern meter cabinet.