Looking for the perfect winter desk accessory? [Wq] has created a beautiful coaster made out of PCBs that can keep your drink warm with an internal heater. (Chinese).
An ESP8266 sits as the main controller, with an additional MQTT control option, where the whole unit is powered over a USB-C connection. On board PCB traces, in the shape of a Hilbert curve, create the heating element used to heat beverages placed on the coaster, where [Wq] reports a measured resistance of the PCB trace network at 1.2 ohms. [Wq] writes that an AON6324 MOSFET replaces the D4184 that was previously being used, but might need some testing to get working properly. There are two capacitive touch sensors which has a TTP223E capacitive touch controller attached to detect input, with a multi-colored FM-3528 RGB LED for user feedback.
We love the artistry that went into building the coaster. For adventurous hackers wanting to build their own, the bill of materials (BOM), source code and board files are all available. We’ve seen everything from coasters and to PCB reflow boards, so it’s nice to see experimentation with a combination of these ideas.
5 thoughts on “ESP8266 Coaster Keeps Your Drink Warm”
I wish I still had my original Mattel ThingMaker cup holder warmer. It wouldn’t work with today’s mugs though.
Reminds me i want to build a butter dish that keeps the butter at the perfect spreading temperature.
That’s a dangerous invention. The fact that butter is hard to spread is the only reason I am in reasonably good health.
It’s a beautiful design, but is it also a good product idea?
Most cups are made of thermally insulating materials (glass, ceramics), which are not suitable for this product. You would need a metal cup. Problem with a hot metal cup is that you will burn your lips (and your fingers if the cup doesn’t have an ear).
If you want your drink to keep warm, put it in a thermos bottle.
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