Done a few things in the programming.
Things added:
-added a buzzer for sound notification
-when state changes to hot, it will beep once for 20ms
-when state changes to cold, it will beep once for 10ms, wait 10ms, then beep 20ms
-when state changes to super hot, it will keep beeping every 10ms (can't be stopped bcoz in while loop)
-fixed the light system (below 1V and beyond 0.3 V blue LED lights upl below 0.3 V, white LEDs light up)
-added 'OFF' indication in LCD when temperature sensor is not turned on
Future updates:
-fixing 'while loop' system in the thermal sensor
-added long beep to super cold state
-using LM35DZ to make a better, more accurate sensor
-adding more features to the LCD such as moving text, blinking text, etc.
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