Is your beverage too cold? Too hot, maybe? Are you constantly burning your delicate lips on your scalding hot toddy? Do you frequently suffer from brain freeze caused by irresponsibly-chilled smoothies? Than has Akshay Baweja got the coaster for you! Just follow his Costie tutorial, and in no time at all you’ll be drinking your beverages with a smile on your face, content in the knowledge that the temperature is optimal.
Costie is a smart table top coaster with LEDs embedded within its surface. Through the magic of refraction, it will light up your glass with a rainbow of colors to signify the current temperature of the contents. It’ll even let you know if your glass is empty — or at least at room temperature. Building Costie should only cost about $14, so there’s no longer any excuse for torturing your mouth with improperly-temperatured beverages.
This will require a custom PCB, but it’s small enough to be affordable. Components are also surface-mounted, which can be tricky to solder. You’ll probably want a reflow setup for this one. Those components include an ATmega328, a temperature sensor, 20 WS2812B SMD LEDs, a small LiPo battery, and a wireless charging module. Follow Baweja’s instructions to assemble Costie and install the code through the Arduino IDE. The enclosure can be 3D-printed, laser-cut, or milled on a CNC machine. Put it all together, and you’ve got one fancy coaster!