You use a potential divider ( two resistors ) to cut down the voltage so that with maximum voltage you only get 5V at the arduino input.
I use the analog input of the Arduino to read voltage above 5volts? When you reach 220Km/h the voltage is 13.33 volts.
Can someone help me?
--[VIN -----[ 100k resistor]--- --------------------------------------> >-----(Arduino analog input)
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[47 k ohm]
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V (GND)