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Voltage is the difference in electric potential between two points of an electric circuit, measured in Volts (V). Voltage can be constant (DC) or varying (AC).
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need at least 5 volts but 3.7 lithium polymer battery does not supply enough Voltage
Using a lower voltage display like an led based one will simplify the system. My favorite thing to use is the adafruit feather huzzah8266 with the charlieplex display board on top. …