Without a "servo", how can you still provide a temperature gauge? Your brief is to provide a temperature gauge to help a kid who don't really understand the measurement of temperature (degrees Celsius or Fahrenheit) on what to wear based on the temperature in the room. Sit with a friend to discuss what you would suggest to the child to wear and how to depict it pictorially. Clue: Maybe to wear a shirt if cool, a water bottle when hot etc. also the child may not understand temperature measurement but you do!

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