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For example Olimex ESP32-POE or LilyGo T-Internet-POE Steps to build your own DTU Use of GPIOs In general, ESP32 chips allow to use any function on any GPIO pin. There are a few restrictions, which are documented at the respective ESP32 (-S3) DevKit subpages. Freely wire the logic pins between your ESP32 (-S3) module and peripheral components.
This project was started from this discussion (Mikrocontroller.net). It was the goal to replace the original Hoymiles DTU (Telemetry Gateway) with their cloud access. With a lot of reverse engineering the Hoymiles protocol was decrypted and analyzed.
In addition to the manufacturer's DTU, there are 2 open source projects for a DIY DTU: AhoyDTU and OpenDTU. The hardware basis of the projects is an ESP32 and an additional radio module. Depending on the inverter type, an nRFL24L01+ radio module is required for the HM series and a CMT2300A radio module for the HMS series.
My vaccum robot decided to eat the cable of my ESP32 which was running OpenDTU and in the process the USB connector was ripped of the board. So I had to replace the ESP32 and flash and install OpenDTU. This process is documented here for my future self and others.
It was the goal to replace the original Hoymiles DTU (Telemetry Gateway) with their cloud access. With a lot of reverse engineering the Hoymiles protocol was decrypted and analyzed. Support For support using OpenDTU you can find us on GitHub or Discord: GitHub Discussions Discord Chat Donate The firmware is opensource and free to use!
Steps to build your own DTU Use of GPIOs In general, ESP32 chips allow to use any function on any GPIO pin. There are a few restrictions, which are documented at the respective ESP32 (-S3) DevKit subpages. Freely wire the logic pins between your ESP32 (-S3) module and peripheral components.
Software for ESP32 to talk to Hoymiles/TSUN/Solenso Inverters, VE.Direct devices, battery management systems, and related peripherals - hoylabs/OpenDTU-OnBattery
使用ESP32为主控，带以太网和4G模组的DTU采集器。
Read Data from Small Inverters Via MCUs ESP32 With OpenDTU for Balcony Power Plants The reliable micro-inverters from Hoymiles do not have integrated Wi-Fi connectivity. In order to read out the current power, daily and cumulative energy production, and other data, an extra Data Transfer Unit (DTU) is required.
Flash ESP32 Multiple USB-Ports Your board may be equipped with multiple USB ports. This is mostly the case for ESP32-S3 boards. One of the port connects to a USB-UART bridge on the board, while the other connects to the ESP32 natively using USB. The former port may be labeled "UART" or "COM" and the latter port may be labeled "USB".