It’s to limit the current flowing through the motor. The motor is rated 75mA and 3V. (so when sourcing with the +5V, we need a resistor of at least 2/0.075 = 26.6Ω).
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It’s to limit the current flowing through the motor. The motor is rated 75mA and 3V. (so when sourcing with the +5V, we need a resistor of at least 2/0.075 = 26.6Ω).