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Temperature Control System

The goal of this project was to design a temperature monitoring system that controls and regulates the temperature of a particular environment.

We need two ATMega32 microcontrollers, one to read the value of temperature and another to take action upon it. Therefore, the two chips is connected using a communication protocol (SPI is advised in this case). The tasks of each chip are mentioned below:

The Master

  • Receives two temperature values A and B from LM35 sensors. (Temperatures range between 0 to 100 degrees.)
  • Constantly compares the two values, and as long as A is higher than B, converts the analog value of A to digital. The conversion should happen in real-time and as fast as possible therefore, no use of comparator interrupts is recommended.
  • Sends the digital value of A to the slave.
  • Prints the digital value of A on a 16x2 alphanumeric LCD.

The Slave

  • Receives the temperature value from the master.
  • For temperatures between 25 and 55 degrees, the cooler motor must be turned on, starting with a duty cycle of 50% plus 10% for every additional 5 degrees. (E.g., for a temperature of 37 degrees, the duty cycle is 70%)

  • Turns the heater on if the temperature is lower than 20 degrees.

  • Makes a red warning LED blink if the temperature is higher than 55 degrees (the cooler must stop working at this point).