Lesson 40--Microduino DC Motor Drive (Potentiometer PWM control speed)

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Objective This tutorial will teach you how to control the speed of a DB motor via the potentiometer. Equipment Microduino-Core Microduino-FT232R Other equipment Breadboard Jumper one box Breadboard one piece DC motor one Potentiometer one NPN transistor one 2.2k resistor one Diode one USB cable one Schematic Description: When connect the NPN transistor, Base (B) connects with 2.2K resistor, emitter (E) connects the GND and collector (C) connects to motor. As follows: Program int potPin = A0; //Potentiometer input pin int motorPin = 9;//Motor pin int potValue = 0;//Define the value of potentiometer int motorValue = 0;//Define the value of motor void setup() { Serial.begin(9600); } void loop() { potValue = analogRead(potPin); //Read the value of potentiometer motorValue = map(potValue, 0, 1023, 0, 255);//Map to a value among 0~255 analogWrite(motorPin, motorValue);//Output PWM to motor //Display Serial.print("potentiometer = " ); Serial.print(potValue); Serial.print("\t motor = "); Serial.println(motorValue); delay(2); } Debug Step 1: Copy the code to IDE and compile it Step 2: Set up circuit, as follows: Step 3: Run program Step 4: Adjust potentiometer, and check the speed of the motor Result Twist potentiometer to adjust the motor's speed Video