Example: air traffic controller
DC motor circuits - SparkFun Electronics
Arduino lacks a true analog output! Use Pulse-width modulation (PWM) to simulate a variable DC supply voltage! PWM is a common technique for supplying variable power levels to “slow” electrical devices such as resistive loads, LEDs, and DC motors! Arduino Uno has 6 PWM pins: Digital I/O pins 3, 5, 6, 9,10, and 11!!
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