Embedded-Temperature-Controlling-System

• This system is designed to provide a temperature controlled functionality with some timing constraints.
• The system provides the ability to reach a targeted temperature requested by a user interface.
• It provides information for the user about the system state, the current temperature and the selected set temperature.
• It enables the user to calibrate the heater output through a potentiometer interfaced with ADC.

Applied Concepts:

• layered architecture.

  1. MCAL
  2. HAL
  3. Service
  4. Application

• Design Patterns:

  • Proxy pattern: all the micro-controller abstraction layer (MCAL) is implemented with a proxy pattern that encapsulates and abstracts the hardware.
  • Periodic Polling: the core Scheduler of the main application is implemented with periodic polling pattern
  • State Machine: system states are treated as state machine.

• Real-time Design Constraints: Some components required periodicity and maximum jitter, such as:

  • Temperature sensor update: every 200ms.
  • The calibrator update: every 500ms.
  • LCD Animation steps: every 100ms.
  • Heating checker: checks if the system doesn't reach the targeted temperature for 3 consecutive minutes.
  • Jitter is assumed 10% of periodicity of each component.

System Components

System is consisted of the following:

1. Atmega32 Microcontroller.
2. LM016 character LCD.
3. TC72 SPI to temperature convertor.
4. 4X3 Keypad.
5. PWM to voltage convertor module.
6. Calibration resistor.

System States Flow