View source for Lesson 7--Microduino Drive servo (no library)

{{Language | 第七课--Microduino 舵机驱动，不用库函数}}
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==Objective=
This lesson will teach you to derive servo by Microduino without library.

==Equipment==
*'''[[Microduino-Core]]'''
*'''[[Microduino-FT232R]]'''
*Other equipment:
**Breadboard Jumper            one box   
**Breadboard  	               one piece  
**USB Data cable               one
**Servo                        one

==Schematic==
[[File:第七课-Microduino控制舵机原理图.jpg|600px|center|thumb]]

==Program==
Download program:
https://github.com/Microduino/Microduino_Tutorials/tree/master/Microduino_Advanced/MicroduinoServoWithoutLibrary

<source lang="cpp">

int sp1=7;//Define the servo port pin 
int pulsewidth;//Define the pulse width
int val;
int val1;
int myangle1;

//servopulse function
void servopulse(int sp1,int val1)//Define a pulse function
{
  myangle1=map(val1,0,180,500,2480);
  digitalWrite(sp1,HIGH);//Set the servo port to high
  delayMicroseconds(myangle1);//Delay time
  digitalWrite(sp1,LOW);//Set the servo port to low
  delay(20-val1/1000);
}

void setup()
{
  pinMode(sp1,OUTPUT);//Set the servo port as output
  //Set the baud rate
  Serial.begin(9600);
  delay(500);
  Serial.println("servu=o_seral_simple ready" ) ;
}

void loop()//Map the number 0 to 9 as the Angle of 0 to 180, and let LED flashing the corresponding number
{
  val=Serial.read();//Read the serial port value
  
  if(val>'0'&&val<='9')
  {
    val1=val-'0';//Get the pure number
    val1=map(val1,0,9,0,180);//Convert angle to pulse width value of 500-2480
    Serial.print("moving servo to ");
    Serial.print(val1,DEC);
    Serial.println();
    for(int i=0;i<=50;i++)//Given enough time to make servo to rotate specified angle
    {
      servopulse(sp1,val1);//Invoke the pulse function
    }
  }

}

</source>

==Debug==
Step 1: Setup circuit, as following:

[[File:第七课-控制舵机电路.jpg|600px|center|thumb]]
Step 2: Copy the code to IDE and then compile, run it.

Step 3: Open the serial monitor, input 1 ~ 9.
[[File:第七课-串口监视器输入0到9.jpg|600px|center|thumb]]


==Result==
Enter a number, the servo will rotate corresponding angle.

==Video==