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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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