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Author Topic: 120 degres servo  (Read 968 times)
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Bacau, Romania
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hello
I have a servo like this: http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=6222
The problem is the following: servo is only 120 degrees and I need to do 180 degrees. I could reach 180 Arduino board? He is capable of making 180 degrees, but is limited to 120 grade.Can I overcome this limitation?
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Seattle, WA USA
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If the servo is physically limited to 120 degrees, nothing you do in software is going to change that. Time to go shopping...
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however it could be that the pulse widths are not properly setup. if i recall there was a method that let you set the minimum and maximum pulse positions. it could be that the code just needs to be adapted for his servo
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If it is a digital servo, it may need to be reprogrammed to rotate 180 deg.
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is not physically limited to 120 degrees.
how can I see what is the minimum and maximum puls?
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Post your code, and we can help you troubleshoot.
Remember to use the # code button.
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I don't think you connected the grounds, Dave.
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Quote
is not physically limited to 120 degrees.
how can I see what is the minimum and maximum puls?

Look around the forum for zoomkat's oft-posted serial servo example code.

(how do you know it is not limited?)
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The standard servo test code you can use to see what is going on with your servo.

Code:
// zoomkat 10-4-10 serial servo test
// type servo position 0 to 180 in serial monitor
// for writeMicroseconds, use a value like 1500
// for IDE 0019 and later
// Powering a servo from the arduino usually DOES NOT WORK.

String readString;
#include <Servo.h>
Servo myservo;  // create servo object to control a servo

void setup() {
  Serial.begin(9600);
  myservo.attach(7);  //the pin for the servo control
  Serial.println("servo-test-21"); // so I can keep track of what is loaded
}

void loop() {

  while (Serial.available()) {
    delay(1); 
    if (Serial.available() >0) {
      char c = Serial.read();  //gets one byte from serial buffer
      readString += c; //makes the string readString
    }
  }

  if (readString.length() >0) {
    Serial.println(readString);  //so you can see the captured string
    int n;
    char carray[6]; //converting string to number
    readString.toCharArray(carray, sizeof(carray));
    n = atoi(carray);
    myservo.writeMicroseconds(n); // for microseconds
    //myservo.write(n); //for degees 0-180
    readString="";
  }
}

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