Embedded_Systems_Project_AVR

Old school project to create a PID controller for temperature control running a small DC motor fan using Atmel AVR XMEGA-B1 Explained board.

• Requirements:

  • Install and create a new project for the Atmel AVR board (atxmega128b1 recommended).
  • Import the .c and header files into your project.
  • LM19 temperature sensor.
  • Other materials explained further below.

• Description: *The PID-controller controls a temperature in an empty vessel. Temperature is controlled by changing rotational speed of the DC-motor (PWM output duty cycle). The motor runs a fan that ventilates the vessel, which in turn is heated by a resistive load (during testing).

  *A reference value for the temperature can be changed with bush buttons, USART, USB or capacitive buttons. The change of the reference value is handled by a common source (atomic operation). Finally, the temperature value is read by a temperature sensor (LM19) connected to the AVR's internal AD-converter.

• State-machine diagram

  • The functionality of the setup:

• USART

  • Keyboard controls for the USART communication:

• Hardware Setup:

  • (explanation, TODO)