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Geyserwise Thermostat
Just the thermostat, available from some online sellers without buying the rest of a Geyserwise controller.
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Sonoff THR320
Smart relay, designed to interface with external 1Wire sensors.
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ATTiny85
Optional, used to interface between the Sonoff THR320 and the analog thermistor in the Geyserwise thermostat.
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DS18b20 1Wire temperature sensor
Alternative to the ATTiny85. You want a bare IC, not one encased in a stainless steel casing, because it won't fit in the tube.
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