a switching voltage converter would be the best, but also most complicated solution.
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Of course I'd need a switching converter that also steps up at the same time. Such beasts exist, but not with the power I need...
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Oh, sehr cool, danke! Merke ich mir fürs Upgrade, jetzt erst mal die IDGAF-Lösung. :)
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TI hat sehr viel für fast alle Anwendungsbereiche, schöne Tools dazu und gute Dokumentation, wie das aufzubauen sind. Und fertige Eval-Kits.
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außerdem verschenken sie oft sogar Samples. Schaltregler haben aber durchaus ihre Tücken, ich arbeit mich gerade auch rein.
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powergating the sensor might be essential to long run time. And do not bother to do raw UDP instead of MQTT, it is not worth the hassle.
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I figured that much, there's a FET designated for that purpose already. And: that wouldn't even occur to me.
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Also use a super low drop LDO... Super low... Every mV kills some mW

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Also, that would get rid of the 3.3k resistor between VCC and GND in the ESP32 Core design. That thing alone kills the battery in a month.
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the esp32 support 2,3 - 3.6 i would give it a shot running on one cell. How long do you need it to run?
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For months.
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ping sharan he did a similar thing some month ago and has probably some results
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Works great, let it go to sleep controlled when voltage drops below 2.9V to save the cell. 4*24Byte per Hour for ~1 Year
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Get a "Lithium Batterie Saft LS14500/AA" with 3,6V. No need for any regulator
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