I simply love the Smart Coaster DIY project since I have burnt my lips too many times to count while drinking coffee. With a learning sensor from http://www.aniomagic.com/learning_sensors.php Aniomagic, a smart coaster was built that monitors the temperature of the drink: green means it’s just right, red means it’s way too hot, and white means that it requires heating.
Check out the instructions here.
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