Microwave Oven Controller Project

Aim:

This project simulates the embedded controller in a microwave oven.

Hardware Used:

• LCD

• Keypad

• One External Push Buttons

• TM4C123G Launch Pad ( Tiva C )

Procedure Details:

While not cooking (stopped), enter a choice to begin cooking:

Case A:

If A is pushed on the keypad (for popcorn),

• LCD shows Popcorn
• Cooking for 1 Minute while the remaining cook time counts down (in seconds) on the LCD,
• LCD is cleared after cooking completes.

Case B & C:

If B (for Beef) or C (for chicken) is pushed on the keypad,

• Beef weight? or Chicken weight? (respectively) appeares on the LCD.

• Then the user must enter an integer value between 1 and 9 on the keypad to indicate how many kilos are there to be defrosted.

         NOTE:  Only whole kilo values are to be entered. 
  

• After a valid number is entered, LCD display is cleared and the value of the weight is displayed for 2 seconds.

• Cooking starts while the remaining cook time counts down (in seconds) on the LCD

        Beef is defrosted at a rate of 0.5 minutes per kilo. 
        Chicken is defrosted at a rate of 0.2 minutes per kilo.
  

• If an illegal number is entered** , LCD shows “Err” for 2 seconds, then shows previous message.

Case D:

If D is pushed on the keypad.

• Cooking Time? appeares on the LCD.
• After that the user can enter a value between 1 and 30 to indicate the cooking time required in minutes and seconds.
• This value is displayed on the LCD as it is entered, right to left.

For example :

Pressing 1 displays 00:01 , Then pressing 2 displays 00:12 , Then pressing 4 displays 01:24 , Then pressing 5 displays 12:45.

• Press button1 (SW1) to clear the LCD display.
• Press button2 (SW2) to start cooking and counting down (in seconds) the cooking time on the LCD.

Start/Stop/Pause cooking conditions:

Switch SW3 (external push button) simulates the microwave oven door latch where:

1. Switch being down would be simulating the open-door situation
2. Switch being up would be simulating the door closed situation.

Only when the latch is closed should the oven be able to be started.

• When SW1 is pressed for first time, the oven operation pauses (keeping remaining time on the display).
• When SW1 is pushed for second time after pressing it for first time, time is cleared and the cooking stops.
• When SW2 is pushed after the oven is paused and the door is closed, then cooking resumes from the time it was paused.

While cooking, Opening the door pauses the cooking and keep the remaining time on display.

When the microwave is running, The array of LEDs is ON. When it is stopped, they go off.

If paused, The array of LEDs blinks (wait time on and wait time off) till the cooking is resumed or stopped.

When the microwave completes its function and timer has counted down to zero (regular timed cooking or defrosting),

• The array of LEDs should flash 3 times (wait time on and wait time off),
• The buzzer should produce an audible tone/alarm during these 3 second times periods.

Demo Video

• Microwave-Oven-Controller-Video