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As British admittedly conform to th

Found at: gopher.blog.benjojo.co.uk:70/tealemetry-IOT-tea-coaster

 Building telemetry for tea aka Tealemetry
 ===
 As a British person, I admittedly conform to the stereotype
of tea consumption, and giving I’ve been consuming tea for
most of my life I have gained opinions on all kinds of tea
based variables. The biggest one being the acceptable tea drinking
temperature.
 So the thing is. Black tea (the best tea) needs to be
brewed with near boiling water to taste the best. But at the
same time this is incompatible with me being able to drink it
right away. On top of that because you have to wait for the
tea to cool down, it’s easy to forget about it, and then
it’s too late:

a graph showing the range of temperatures tea can be in

 a graph showing the range of temperatures tea can be in

FLIR camera

 Some people think that drinking tea at 30c or room
temperature is acceptable, I think _those people are incorrect_. However
after missing the acceptable temperature window too many times I
decided I need a way to be alerted when the tea is drinkable. I
got out my FLIR camera and confirmed that the heat spread over
a freshly brewed cup of tea is even at the bottom of the
mug.

a photo of a mug with a FLIR reading of 71C at the bottom of the mug

 a photo of a mug with a FLIR reading of 71C at the
bottom of the mug
 This started me thinking. You could design a tea coaster
that can read the temperature of the mug sitting on it. So I
set out to make a coaster with a slot for a temperature
sensor, and under it, space for a ESP8266 as the microcontroller.

a 3d model of the tea coaster

 a 3d model of the tea coaster
 Then used my flatmate’s 3D printer to print it out in
PLA: