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!
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!
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
Sail winch servos can rotate more than 360 deg.
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.
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 
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
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 Nanotec - Precise and Reliable Motion Control Solutions
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 Small Stepper Motor - ROB-10551 - SparkFun Electronics and use this motor driver EasyDriver - Stepper Motor Driver - ROB-12779 - SparkFun Electronics . Do you think this is a good choice or would you recommend something else?
Thanks again 