查看“Control DC motor”的源代码

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==Objective==

The course will show you how to use “Processing” to control the speed of the DC motor. 

==Equipment==
*'''[[Microduino-Core]]'''
*'''[[Microduino-FT232R]]'''

*Other Hardware Equipment 
**A USB cable 
**A box of jumpers 
**A breadboard
**A DC motor 
**A potentiometer  
**A resistor of 2.2K Ω 
**A diode  
**A transistor NPN


==Schematic==

[[File:processingDCMotorSchematics.jpg|600px|center|thumb]]

==Program==

Refer to MicroduinoDCMotorControl

ProcessingDCMotorControl

==Debugging==

Step 1：Build hardware environment in accord with the schematic, just like this:  
[[File:processingDCMotorConnectionDiagram.jpg|600px|center|thumb]]


Step 2：Here the code we need：

The code of the two ends (Processing and Microduino)  

Microduino:

//Send output value to the motor after getting the serial data 

  if(Serial.available())//if serial is available
  {
    leitura=Serial.read();//read serial data
    Serial.println(leitura);
    vel=map(leitura,0,255,0,1023);//map
    if(leitura>0)//run motor by leitura
    {
      analogWrite(motorPin,vel);
      delay(1);
    }
    else//stop motor
    {
      analogWrite(motorPin,LOW);
    }
  }

Processing:

//List all the serial ports and get data of the first serial port 
  // List all the available serial ports in the output pane.
  // You will need to choose the port that the Wiring board is
  // connected to from this list. The first port in the list is
  // port #0 and the third port in the list is port #2.
  println(Serial.list());
  // Open the port that the Wiring board is connected to (in this case #0)
  // Make sure to open the port at the same speed Wiring is using (9600bps)
  port = new Serial(this, Serial.list()[0], 9600);

//Draw and update
  void draw() 
  {
    background(0);
    update(mouseX/10); 
    println(mouseX);
  }

//Transmit the x-coordinate value of the mouse through the serial port and draw the current value on Processing 
  void update(int x) 
  {
    port.write(x);
    stroke(255);  
    line(mouseX, 0, mouseX, 160);   
    text (mouseX, mouseX, 180);
  }

Step 3：Download the code and compile successfully. . 

Step 4：Move your mouse around in “Processing” after the system goes well to see speed change of the motor. 

==Result==

A simple speed indicator will be displayed on the screen. The speed of the motor will change along with the change of your mouse on the x-coordinate. 
[[File:processingDCMotorResult.jpg|600px|center|thumb]]


==Video==


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