As part of a small project, data from several smart meters in a large meter cabinet (all equipped with a SML IR interface) had to be read more or less simultaneously and published via MQTT. To avoid installing an ESP8266 with Tasmota and IR reading head for each electricity meter, this firmware was developed for an ESP32 microcontroller that can read SML messages from up to eight smart meters simultaneously using RTOS tasks.
- based on sml_parser library
- read data from up to 6 smart meters simultaneously
- publish readings with timestamp to MQTT broker
- optional MQTT authentication
- TLS support
- ESP32 development board (e.g. Wemos LolinD32)
- multiple SML IR reading heads
- 3D printed IR reading head housing with 27mm neodymium ring magnet
- 5V USB power supply
To compile the firmware for the ESP32 controller just download Visual
Studio Code and install the PlatformIO
add-on. Open the project
directory and adjust the settings in include/config.h to your needs.
Since the software was developed on a MacBook you might need to adjust the upload port
settings
in the section [common] in platformio.ini. For further firmware updates
use the OTA option in the web interface.
Pull requests are welcome! For major changes, please open an issue first to discuss what you would like to change.
Copyright (c) 2023 Lars Wessels
This software was published under the Apache License 2.0.
Please check the license file.