Alright here is a microwave.(oven) for food heating.
The functions of the buttons are the following :-
-> The first one is to set the number in ones(upto 9)
->The second one is to set in tens,that means the first seven segment display will be affected
-> The third one is to start the countdown from any number you have set.
-> The fourth one is to rest the thing after it has ended(when the last three seven segment display displays "END")
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The motor will control the rotating tray on which the food will be kept and the fan(in real life it's an induction motor but here I have used DC).Also the two lights are for the interior lighting.The motor and the lights go of when the countdown stops.If you want to use it again
Press the fourth button.
Thank you for reading.