The purpose of this project is to ensure that a user knows when their tea is at a perfect temperature. This is done by monitoring the temperature using a sensor, and communicating it using different colored LEDs.

Project Panel

The ideal temperature range of a cup of tea is determined by the user. The red LED is lit when the temperature is above this range, green when within the range, and blue when the temperature is below the range. The LED blinks when the temperature is near the transition point from hot to ideal or from ideal to cold. The temperature sensor is secured in a koozie that holds the glass containing the tea. Consequently, the temperature readings are not based on the temperature of the tea but on the temperature of the glass. The ideal temperature range was adjusted based on this measurement. A distance sensor is also secured in the koozie. This sensor can identify when the glass is in the koozie. This ensures that the LEDs only light up when there is a glass present. An additional feature is included using a push button that allows the user to cause all three LEDs to blink. This feature could be used in a restaurant or cafe setting for a customer to communicate to a waiter that they have finished their drink and would like a refill.

Project Video

This video shows the breadboard with the LEDs while tea is cooling down inside the koozie.