FLOOR-HEATING-IO-MODULE

Description

• A floor heating controler device that is designed to operate 4 separate zones with TWAs (Thermal Wax Actuators) and 4 PT1000 temperature sensors per zone. The device is able to to get up to a specified temperature and will hold it there by use of a PI controller.
• The device is designed to be connected to a main controller, which can monitor it, communicate with it and set its set point temperature all through the MODBUS communication protocol.
• NOT YET TESTED Ability to connect to wireless thermostats using Zigbee and set temperature and retrieve temp reading.

Software Description

• A STM32WB55 Nucleo board was used to vevelop the softwrae. Running freeRTOS with multiple threads - MODBUS thread, PI thread, temperature ADC thread.

  - IO_MODULE_proj //main STMCubeIDE project folder
  |  - Core
    |  - Inc
      |  - main.h
      |  - IO_Config.h //configuration file, sets the number of rooms
      |  - app_freertos.h // io_module_t structure decleration and enums used for registers and coils
      |  - ModbusConfig.h //configuration file for Modbus
    |  - Src
      |  - main.c
      |  - app_freertos.c //code for PID, temperature threads and other used functions
      |  - PID0.c //functions used to calculate PID values
    |  - Middlewares/Third_Party
      |  - FreeRTOS/Source //freeRTOS files
      |  - MODBUS-LIB //Modbus library folder
      |  - OLED_SSD1306 //OLED library folder (configured but not initialized)
- IO_MODULE_proj_Zigbee_FreeRTOS //project folder with Zigbee 

• Temperature set point values are stored in "Holding_Registers_Database", see app_freertos.h to see addresses.
• The MODBUS library used is a fork of Modbus-STM32-HAL-FreeRTOS, the fork is available here
• Both ADC and UART have DMA enabled.
• MODBUS - thread "StartTaskModbusSlave", timer "TimerT35", semaphore. Found in Modbus.c
• ADC - thread "CalculateTemp_Thread". Found in app_freertos.c
• PI control - thread "ControlTask", timer "ControlExecTim and "TwaControlTim"
• Captured packets from Zigbee

Contributors

Contributor(s)	Contribution
r0tary	Modbus implementation, freeRTOS implementation
Dimi2509	ADC implemenattion, PI control implementation, freeRTOS implementation
rausitis	Zigbee implementation, freeRTOS implementation
Virtualiden-bot	Zigbee implementation
Azerio102	PI control implementation