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There is a subtle design choice in this board that took be hours to figure out. According the connection schematic the blue leg of the LS3528RGB LED is connected to IO19 through a 1k resister (R2-1). However the power leg is connected to Vusb not 3.3V like the other RGB LED. This means that the LED connected to IO19 is only usable when the board is ...


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The regulator van take up to 21V. Use 2 x 18659 Li-Ion batteries in series.


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As with any electronics, once you get outside of normal operating parameters, behaviour becomes undefined. It's up to you to avoid that. The smartest thing to do is to employ a battery protection circuit or some means to shut down the system (or prevent it from waking up from deep sleep) before the voltage drops too low. This will also prevent your battery ...


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