pcDuino controls a RC servo

Posted by: admin , November 12, 2013

[vc_row][vc_column width=”1/1″][vc_column_text]In this post, we are going to look at how to use pcDuino to control RC (hobby) servo motors. Servos have integrated gears and a shaft that can be precisely controlled. Standard servos allow the shaft to be positioned at various angles, usually between 0 and 180 degrees. Continuous rotation servos allow the rotation of the shaft to be set to various speeds.

In this tutorial, we are going to use a SG90 RC servo.

[/vc_column_text][vc_tour][vc_tab title=”BOM” tab_id=”1384279516-1-87″][vc_column_text]1. pcDuino experiment package

2. SG90 RC servo

3. Jumper wires[/vc_column_text][/vc_tab][vc_tab title=”Wire Diagram” tab_id=”1384279516-2-98″][vc_column_text]SG90 RC servo has three pins: VCC, GND, and control signal. We can wire VCC to 5V pin of pcDuino, and GND to ground of ground of pcDuino. We use pin 7 of pcDuino to act as the control signal.

[/vc_column_text][/vc_tab][vc_tab title=”Sample Code” tab_id=”1384280086316-2-4″][vc_column_text]We are going to use Arduino IDE comes with the pcDuino as the programming environment.

The code is as following:


int servopin=7;//Define servo PWM control as digital 7

int myangle;//define variable angle

int pulsewidth;//define variable pulse width

int val;

void servopulse(int servopin,int myangle)//define a pulse function

{

pulsewidth=(myangle*11)+500;//translate angle to a pulse width value between 500-2480

digitalWrite(servopin,HIGH);//pull the interface signal level to high

delayMicroseconds(pulsewidth);//delay in microseconds

digitalWrite(servopin,LOW);//pull the interface signal level to low

delay(20-pulsewidth/1000);

}

void setup()

{

pinMode(servopin,OUTPUT);//set the interface pin as output

}

void loop()//translate the number 0-9 to angle between 0 degree to 180 degree, and let LED blink the same times

{

val=9；
val=val*(180/9);//translate number to angle

for(int i=0;i&amp;lt;=50;i++)//wait enough time so that the servo can rotate to the specified angle

{

servopulse(servopin,val);//call the pulse function

}

}