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This code is used to display voltage and frequency measurements on an OLED display. The voltage measurement is done by using an analog input and a voltage divider circuit with resistors R1 and R2, ...
Arduino board requires a USB cable connected to a laptop/PC or an external AC/DC adaptor for power supply. If you want a portable Arduino-based project, you need a battery for power supply. 9V PP3 is ...
to convert 12v ~ 5v R1 = 13kOm R2 = 20kOm || constant for arduino nano : KF 0.00488758553 ; error 0.021 ; ...
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