set servo angle

Other Hardware Motors, Mechanics, Power and CNC
1

I am new to Arduino, and have started a simple project to move a servo motor to a specific angle. I am using an Adruino UNO and a Futaba S3003 servo.I bought on ebay, both powered by the same 6v battery. The servo signal wire is connected to either pin 4 or 6
The command I am using in my sketch is

Servo.write(angle);

where angle is a number , eg Servo,write(180); The problem is the servo will only move to the nearest fixed angle ie 0,45,90,135 or180. I wish to move it a a dfifferent angle eg 170 but it always moves to the nearest fixed one.

Have I bought the wrong hardware to enable me to do this? I have tried with 2 servos, both the same model.

2

@graygee

Your topic was Moved to it's current location / section as it is more suitable.

Could you take a few moments to Learn and Use The Forum

It will help you get the best out of the forum in the future.

  • Your OS and version can be valuable information, please include it along with extra security you are using.

  • Always list the version of the IDE you are using and the board version if applicable.

  • Use quote or add error messages as an attachment NOT a picture.

  • How to insert an image into your post. ( Thanks @sterretje )

  • Add your sketch where applicable but please use CODE TAGS ( </> )

  • Add a SCHEMATIC were needed even if it is hand drawn

  • Add working links to any specific hardware as needed (NOT links to similar items)

  • Remember that the people trying to help cannot see your problem so give as much information as you can

COMMON ISSUES

  • Ensure you have FULLY inserted the USB cables.

  • Check you have a COMMON GROUND where required. ( Thanks @Perry)

  • Where possible use USB 2.0 ports or a USB 2.0 POWERED HUB to rule out USB 3.0 issues.

  • Try other computers where possible.

  • Try other USB leads where possible.

  • You may not have the correct driver installed. CH340/341 or CP2102 or FT232 VCP Drivers - FTDI

  • There may be a problem with the board check or remove your wiring first.

  • Remove any items connected to pins 0 and 1.

COMPUTER RELATED

  • Close any other serial programs before opening the IDE.

  • Ensure you turn off any additional security / antivirus just to test.

  • There may be a problem with the PC try RESTARTING it.

  • You may be selecting the wrong COM port.

  • Avoid cloud/network based installations where possible OR ensure your Network/Cloud software is RUNNING.

  • Clear your browsers CACHE.

  • Close the IDE before using any other serial programs.

  • Preferably install IDE’s as ADMINISTRATOR or your OS equivalent

ARDUINO SPECIFIC BOARDS

  • CH340/341 based clones do not report useful information to the “get board info” button.

  • NANO (Old Types) some require you to use the OLD BOOTLOADER option.

  • NANO (ALL Types) See the specific sections lower in the forum.

  • NANO (NEW Types) Install your board CORE’s.

  • Unless using EXTERNAL PROGRAMMERS please leave the IDE selection at default “AVRISP mkII”.

  • Boards using a MICRO usb connector need a cable that is both DATA and CHARGE. Many are CHARGE ONLY.

CREATE editor install locations.

  • On macOs ~/Applications/ArduinoCreateAgent-1.1/ArduinoCreateAgent.app/Contents/MacOS/config.ini

  • On Linux ~/ArduinoCreateAgent-1.1/config.ini

  • On Windows C:\Users[your user]\AppData\Roaming\ArduinoCreateAgent-1.1

Performing the above actions may help resolve your problem without further help.

Language problem ?

Try a language closer to your native language:

Thanks to all those who helped and added to this list.

3

both powered by the same 6v battery

Not a good idea, the Arduino needs 7.2V on the VIN pin OR 5V on the 5V pin. There is no reason a servo would do the action you describe.
Please post :
Your FULL schematic of how everything is connected.
Your CODE you have used to test the servo.

Also, have you got a potentiometer? you can make a servo tester useing one, along with the code provided with the IDE.

4

I've used quite a few S3003s and none have them have behaved as you described. So I guess it's something that you are doing which you've told us nothing about.

When I think about it I've never seen any hobby servo that only moves in jumps like that. If you have a potentiometer try the Knob example from the IDE. If your servo doesn't move smoothly with the pot then you have bad servos and certainly not real Futaba S3003s.

Steve