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    Potentiometers and Arduino Analog Input

    makeabilitylab.github.io/physcomp/arduino/potentiometers.html

    Yapay zekadan makale özeti

    Potentiometer Basics
    • Potentiometer is a three-terminal resistor with sliding/rotating contact
    • Resistance between outer legs (1-3) remains constant
    • Middle leg (2) varies with wiper position
    • Total resistance (R_total) always equals sum of outer leg resistances
    Potentiometer Usage
    • Can be used as variable resistor with two legs
    • Can be used as voltage divider with three legs
    • Additional fixed resistor needed for voltage divider configuration
    • LED dimmer example demonstrates correct potentiometer usage
    Analog Input
    • Arduino Uno has 6 analog inputs (A0-A6)
    • Arduino Leonardo has 12 analog inputs (A6-A11)
    • Analog input pins measure voltage between 0-5V
    • Arduino's 10-bit ADC converts 0-5V to 0-1023
    • Higher resolution boards use 12-bit ADCs (0-4095)
    Circuit Implementation
    • Incorrect configuration: only two legs connected to A0
    • Correct configuration: all three legs connected as voltage divider
    • Voltage across potentiometer must be measured
    • Analog input voltage calculated using R_2/R_1 + R_2 formula

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