qba667 / vdmot_controller

Controller for HmIP-VdMot actuators

VdMot_Controller

This is a controller for HmIP-VdMot actuators.

It controls up to 12 HmIP-VdMot actuators or other DC motor valves and is based on custom hardware/software.

It's an alternative to the original HmIP-FALMOT-C12 hardware. My intention was to create a cheap solution to operate my 18 valves (floor heating + radiators). I wanted a pure offline system (no cloud connection) and to be free of the constraint to use further components like CCU2/CCU3.

Features:

• controls up to 12 HmIP-VdMot actuators or other DC motor valves
• learns valve movement by counting motor revolutions based on Back EMF
  • so positioning accuracy should be (very) good
• valve current is evaluated and can be monitored
• interfaces
  • actual: MQTT, JSON
  • optional: MODBUS-RTU via RS485, CAN via external MCP2515
• integrated 1-wire master
  • a lot of additional temperature sensors like DS18B20 could be connected
  • sensor values can be linked to a valve for combined data evaluation
  • usefull for hydraulic balancing ("Hydraulischer Abgleich")

Status

• b-sample hardware is working
• c-sample hardware is working
• c2-sample hardware finished and working
• valve learning, opening and closing is working
• connection to FHEM or [IOBroker] established via MQTT
• read and set values via JSON
• first productive test passed
• tests of 2 different actuators done, see system/actuators.md
• one wire sensors working
  • sensors can be coupled to a valve
  • therefore the sensor adresses are stored and assigned at startup
• eeprom working
• STM32 can be flashed by ESP32 via WebUI without additional hardware
• simple test of RS485 interface with modbus-rtu master sucessfully performed
• simple test of CAN interface via MCP2515 sucessfully performed
• replaced relay with fet transistors

Hardware

• find description of hardware here hardware/hardware.md

Software

For details please see software.md

• written in C / C++
• uses great arduino libraries
• developed using PlatformIO
• STM32 BlackPill
  • controls the valves / dc-motors
    • endstop by real current measurement
    • counting motor revolutions by back-EMF
    • state detection
  • controlls 1-wire devices via GPIO
    • optional via DS2482-100 1-wire bus master ic
• ESP32 / WT32-ETH01
  • communication with MQTT broker or JSON interface
  • visualize system status
    • valve state
    • temperature sensors
    • optional: integrated control algorithm
  • OTA software update (of ESP32 and STM32)

License

This project is licensed under the terms of the GNU General Public License v3.0 license.