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To be honest you are better off stepping down rather than stepping up. Simply because step down converters tend to be a higher efficiency and can deliver more current than a step up converter. With step up converters you effectively convert current into voltage. With step down it's the other way around - voltage into current. Since button cells have very ...


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Why not use three button cells and a buck converter to lower the voltage from 4.5V down to 3V?


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Generally, to step up voltages you can use a boost converter. But I doubt that using coin cells to supply an esp32 is a good idea, because they probably won't last very long and are relatively expensive. Even if you use sleep modes, the voltage margin will be small (of course, that depends on the boost converter).


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Your approach looks reasonable, but you don't have enough power. The motors will draw 10A, which is the full output of your power supply/battery. That doesn't leave any left over for your Arduino system. You should have a high enough capacity power supply/battery for your total peak power requirement plus a little margin (say 10%-20%) The Arduino and all ...


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Sometimes Tx and Rx are connected directly despite the fact, that it works on different voltages, sometimes resistor dividor is used, sometimes it goes through resistor. Why no consensus? What are differences? There is some uncertainty as to whether the ESP8266 has 5V tolerant inputs or not. This uncertainty stems from differences in an early Chinese ...


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