BotBrain CRS Continuous Rotation Robotics Servo

This worked quite well for me. Not sure why others complained about it. It is pretty torque-y too.Some specs from my (very quick) test:Brown = groundRed = power (5V and 3.3V both worked for me; lower voltage = more sluggish)Yellow = control (connect this to your board's PWM output)If you're using the Arduino servo library, writing 0 to the motor = full speed clockwise, 180 = full speed counter-clockwise, approximately 90 = stall. Writing anything beyond 180 is treated as 180 as far as I can tell. If you care about precision and want the servo to stall at exactly 90, you'll need to adjust a potentiometer. This potentiometer is located in a small hole above where the wires connect into the servo unit. Simply stick a small screwdriver in and turn it.The angular velocity of the servo does vary depending on the value you write to it, but this relation isn't linear. So while 0 may be full speed clockwise, 45 (which is midway from the stall point at 90) won't give you half the rotation rate. Angular velocity changes are more obvious nearer to the stall point. From my experience, this useful zone seems to be between 80 and 100.The servo consumes a substantial amount of current, especially near the stall point. If you find that you can't upload sketches to your Arduino while your servo is being driven, try disconnecting the USB cable, followed by the motor, then reconnect the USB cable and re-upload the sketch again before you reconnect the motor.Good luck!

Quality looks good, I haven't test em yet but I will add my comments later

I ordered two of these to use with an arduino. Both worked initial, but then failed to deliver any consistent rotation. Rotation rate was not consistent, and servos would often lock-up and fail to rotate at all. I would not recommend this servo.

I've had this servo for a year. It is attached to my desk window blinds to automatically open and close them based on light level outside. I'm using an Arduino with a light sensor to open in the AM and close at night (FYI that I'm also using OpenHAB to monitor/control it). In this configuration, the servo has gotten used consistently 2 times a day opening and closing the blinds in the AM and PM.Unfortunately it started having calibration problems a couple of months ago and now can't seem to both close and open the blinds without adjusting the "adjustment screw" on the servo. Basically, when it gets dark and the servo is told to spin clockwise, it only spins counterclockwise continuously. I expected it would have lasted much longer and been more precise.

Not a terrible servo, has very good torque. Calibration is rather difficult to do with an arduino. Out of the box it was perfect, but after a minor pot adjustment, it never worked the same. I got it to worked the way I needed it to with some programming tweaks and trial and error.

Works well, all which I received are entirely functional which is more than you can ask from most servo providers. Somewhat slow, but good torque for a rotational. All in all, seems to be a quality product.

No documentation available though it works to standards.

It did not came with any instructions and their website does not provide clear details of the PWM needed to handle this servo. I bought other ones (parallax) that work great and their website has documentation that covers all the needs. Honestly, it was a waist of money.