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Arduino Tutorial Series Running A

Servo Motor Without A Library

Posted on January 10, 2013byadmin

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Home Arduino Tutorials About Me
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Yet another version of running a servo motor without using a

library. My first example have no speed control. This more

complex version provides user an option for controlling the

speed. However, increasing the speed is limited to servo motor

capacity. On the other hand, it can be set to a very slow mode,slower and even slower than one century.

The wiring.
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tan on Fixing the Slow Arduino

IDE | More Than 20 SecondsDelay

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The sketch.

// attach red wire to 5 volts

// attach black wire to ground

// attach the yellow wire pin 8

const byte servopin = 8;

// to variables the will make the

// servo turn to zero degree every

// restart/reset

int currentPosition = 500;

int commandPosition = 500;
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// larger rotateSpeed value means

// slower and smaller value means

// faster

byte rotateSpeed = 1;

// changing the increment value

// will also change the servo speed

// larger value increases speed

// lower value lowers speed

int increment = 2;

void setup(){ //void setup start

Serial.begin(9600);

pinMode(servopin,OUTPUT);

}// void setup end

void rotate(){//void rotate start

/******************************************

Use the variable currentPosition to

turn the servo motor

The next four lines of codes are the basicto run the servo motor. The delayMicroseconds

can hold value from 500(0 degrees) to

2500(180 degrees)

******************************************/

digitalWrite(servopin,HIGH);

delayMicroseconds(currentPosition);

digitalWrite(servopin,LOW);
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delayMicroseconds(20);

}//void rotate end

void loop(){// void loop start

/******************************************

Set of command to assign value to variable

commandPosition. Open the serial monitor and

letter a,b,c,d,e consecutively.

The commandPosition variable can be assigned

with any value from analog sensor such as

temperature and potentiometer.

******************************************/

if (Serial.available() > 0) { //if serial avail

int data = Serial.read();

if (data =='a'){

commandPosition = 500;

}

if (data =='b'){


} if (data =='c'){


}

if (data =='d'){


}

if (data =='e'){
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}

}// if serial.available end

/******************************************

Set of command to assign value from

commandPosition to currentPosition

******************************************/

if (commandPosition > currentPosition){

currentPosition = currentPosition + increment;

rotate();

}

if (commandPosition < currentPosition){

currentPosition = currentPosition - increment;

rotate();

}

if (commandPosition == currentPosition){

currentPosition = commandPosition;

digitalWrite(servopin,LOW); // stop sending pu

} // as soon as the desired position

// reached

// Rotation speeddelay(rotateSpeed);

}//void loop end

I realized I never posted a the first version after hitting the publish

button.
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ONE THOUGHT ON ARDUINO TUTORIAL SERIES RUNNING A SERVO MOT OR

WITHOUT A LIBRARY

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This entry was posted in arduinoand tagged arduino, servo motorby

admin. Bookmark the permalink.

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Rod on September 1, 2013 at 2:22 amsaid:

Thank you so much for posting this. The standard Servo

library is not compatible with SoftwareSerial because of

issues with interrupts. Thats where going back to basics

is what gets the job done. Very simple code. I could
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customize it within minutes thanks to how well it is

commented. You definitely saved the day!

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