Wow, adding even the simplest sensor to a device seems to add a lot of $. Bonavita electric kettles? $38 without temperature, $66 with. amazon.com/Bonavita-BV382
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I’d guess the cost increase in bill of materials is probably: 15% extra electronics, 35% any analog sensor, 50% display/UI elements. Modular UI or using an existing digital display if there is one would likely cut cost by 50%
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A general strategy is: add WiFi and appify all display.
A great app would be a universal IoT remote control app that can talk to a lot of standard sensor-laden devices via a modular UI/control.
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IoT spillover helps, but steam whistle kettles went off patent like 125 yrs ago. Very specific example / solution though.
More interested in adding fractional operation modes to HVAC. This thing where fans and compressors are binary is ridiculous.
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Temperature sensor kettles are for off-boiling point though, for stiff like pour over coffee. My kettle has auto shutoff at boiling, so that’s a cheap feature. It’s monitoring/actuating sub-boiling temperatures that’s the desirable leading edge feature
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Time and an analog thermometer? Convenience and precision each have a cost.

