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Topic: 360* Servo?? (Read 1 time) previous topic - next topic

dewyoder18

I am working on a project and need a servo that rotates 360*. Here is what i would like to accoumplish. Have 4 pir sensors pointed in 4 different directions. When one of those senses movement my arduino uno will tell a servo to turn to that sensor. And i will have a camera mounted to it also to take a pic. So my question is.... does someone make a servo that would work for my project? Thanks for your help!

retrolefty


I am working on a project and need a servo that rotates 360*. Here is what i would like to accoumplish. Have 4 pir sensors pointed in 4 different directions. When one of those senses movement my arduino uno will tell a servo to turn to that sensor. And i will have a camera mounted to it also to take a pic. So my question is.... does someone make a servo that would work for my project? Thanks for your help!



Be very careful in your selection of a servo that will do what you need it to do. Vendors are not consistent on what they mean by "360 degree servo". Some mean it's a modified continuous rotation servos that no longer can be commanded to go to a specific position and stop there, but rather have been modified to be a simple bi-directional variable speed geared motor drive assembly, I call these latter ones ex-servos. Others when calling their product a 360 degree servos mean a standard servo that has a full positioning range of 0-360 degrees, which is what your application calls for. And don't be surprised that no matter how careful you are in your servo selection, what you end up getting is a continuous rotation instead of a standard servo with 360 degree travel stop, such is the state of servo vendor descriptions and specifications of their products.

Good luck;

Lefty

zoomkat

Sail winch servos can rotate more than 360 deg.
Google forum search: Use Google Advanced Search and use Http://forum.arduino.cc/index in the "site or domain:" box.

kf2qd

Use a stepper motor. The you have much more control over position. The typical stepper has 200 steps per revolution and the positions are the same, no matter which direction you turn. A little more code, but more accuracy and repeatability.

juycce

i would use 2 normal servo(one above the other) insted of stepped motor,beacause for the stepped motor you need EasyDriver...requiers 7-30v,it get hot,and it draw current even to remain in same position....have fun ;)

ReggieTheDog

#5
Feb 06, 2013, 12:56 pm Last Edit: Feb 06, 2013, 01:02 pm by ReggieTheDog Reason: 1

i would use 2 normal servo(one above the other) insted of stepped motor,beacause for the stepped motor you need EasyDriver...requiers 7-30v,it get hot,and it draw current even to remain in same position....have fun ;)

Whether you need an esayDriver really depends upon 'the size' of your stepper motor doesn't it? I'd have thought that a camera would not take that much power to turn. Here is a great site for steppers and you'll see than the Amp draw and the voltage can be very low... circa 0.25A and 3v http://en.nanotec.com/steppermotor_lowcost.html

dewyoder18

Thank ya'll for your help!! I wish I would have done more research on servo's before I bought one but oh well I'll find a use for it sometime. But yea I have decided to go with a stepper motor maybe one like this one https://www.sparkfun.com/products/10551 and use this motor driver https://www.sparkfun.com/products/10267 . Do you think this is a good choice or would you recommend something else?

Thanks again  :smiley-mr-green:

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