Hi,
I am trying basic servo example using the below code
#include <Servo.h>
Servo myservo;
void setup(){
//attaches servo on pin 9
myservo.attach(9);
myservo.write(0);
delay(1000);
myservo.write(90);
delay(1000);
myservo.write(180);
}
void loop(){
}
but the servo moving back and forth for 20 degree's only.. why is that ?
and Built-in led also blinking. i deliberately set it off before running servo example.
Am i doing anything wrong ?
Are you sure that the program is being uploaded to the Arduino ?
Add a Serial.begin() then a print statement at the start and end of the setup() program. Do you see the printed messages ?
How are you powering the servo ? Is anything else connected to the Arduino ?
Hi,
Thanks for reply.
UKHeliBob:
Are you sure that the program is being uploaded to the Arduino ?
Yes. Program is uploaded to arduino
UKHeliBob:
Are you sure that the program is being uploaded to the Arduino ?
Add a Serial.begin() then a print statement at the start and end of the setup() program. Do you see the printed messages ?
i am only getting the first message. see the attached image
UKHeliBob:
How are you powering the servo ? Is anything else connected to the Arduino ?
Only single servo is connected to the arduino.. nothing else is connected.
sweep example is running fine..
and why 'L' led is blinking ?
The serial output in your screenshot does not match the program shown.
Are you still sure that the program is being uploaded to the Arduino ?
UKHeliBob:
The serial output in your screenshot does not match the program shown.
My bad.. please see the attached image
UKHeliBob:
Are you still sure that the program is being uploaded to the Arduino ?
yes
What type of servo is it (please provide a link) and is it powered from the Arduino ?
Tower Pro Micro Servo 9g Link
and it is powered from arduino
Although the usual advice is not to power servos directly from the Arduino you will probably be OK with that small servo as long as you don't operate it for long periods and don't have a load on the output, but no guarantees, so don't blame me if you damage, or have already damaged your Arduino. It would be better and safer to power it from an external source, such as 4 AA batteries.
To summarise your problem, the sweep example works OK but the code in the attachment to reply #4 does not move the servo and there is no serial output after "o degress". In addition, the built in LED flashes. Is that right ?
How often does the LED flash and how long is it on and off ?
Which Arduino board are you using ?
i am using Uno.
the code in the attachment to reply #4 does not move the servo
the servo is moving like 20 degrees back and forth continuously.
i think led is flashing whenever servo is moving
try to postition the servo at 180 only and see what happens:
#include <Servo.h>
Servo myservo;
void setup(){
//attaches servo on pin 9
myservo.attach(9);
myservo.write(180);
}
void loop()
{
}
does it go all the way to 180?
try again sending it to zero...
BulldogLowell:
does it go all the way to 180?
yes, it is moving to 180 and o
after reaching to the 180 the servo is still vibrating ?
anilkunchalaece:
yes, it is moving to 180 and oafter reaching to the 180 the servo is still vibrating ?
that is sort-of normal. while servos are supposed to have a 0-180 range, mostly they don't.
there are ways to eliminate that, but you could try wih software using writeMicroseconds() and find the full rotation value that doesn't give you that chatter/buzzing.
So, how are you powering your Arduino? It may be that low power is causing the servo to sort of move to its destination.
A video would be nice!
BulldogLowell:
how are you powering your Arduino?
Using Computer usb2 port
please find video in this link
and the code used is
#include <Servo.h>
Servo myservo;
void setup(){
Serial.begin(9600);
//attaches servo on pin 9
myservo.attach(9);
Serial.println("pos 0");
myservo.write(0);
delay(1000);
Serial.println("pos 90");
myservo.write(90);
delay(1000);
Serial.println("pos 180");
myservo.write(180);
delay(1000);
}
void loop(){
as you can see in the video it only printing pos 0 and pos90 and continuously moving 20 degrees back and forth
yes, weird but probably power related.
Try moving the Servo's power pin from 5V to Vin.
** edit - you can do this because your power source from the USB is 5V. So you are moving the power to regulated 5V USB instead of the regulator on the Arduino, which (in addition to powering your Arduino) outputs to the 5V pin.
BulldogLowell:
Try moving the Servo's power pin from 5V to Vin.
I didn't understand.
BulldogLowell:
yes, weird
Hurray... 
finally someone agree with me in this forum..
and sweep is working fine
@BulldogLowell
Thankyou.. if i change servo power to Vin, it is working fine.
what is the max current rating of Vin pin ?
In the USB 1.0 and 2.0 specs, a standard downstream port is capable of delivering up to 500mA (0.5A); with USB 3.0, it moves up to 900mA (0.9A).
the video helped a lot!