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

Language	English

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 registor one Diode one USB cable one Schematic Desription： 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);//Mapp 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 http://v.youku.com/v_show/id_XNjgyMzYwMTQw.html