Questions tagged [otherservos]

The otherservos tag should only be used for questions which do not fall into the servomotor or rcservo (hobbyservo) tags.

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1answer
53 views

Double/Triple inverted pendulum always on a cart?

All of the examples of keeping a double/triple inverted pendulum balanced using a PID controller I've seen seem to be on a cart. Like this one https://www.youtube.com/watch?v=cyN-CRNrb3E How come the ...
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2answers
152 views

Applying MoCap data to real life robot

I have a Kinect Sensor, and iPi software I use to create motion capture data to use in film editing. I am looking at creating a small, Raspberry Pi driven bipedal robot just for fun, and I was ...
3
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2answers
749 views

What is the best way to attach a 3D printed part to a servo for robotics use?

I am trying to make custom parts that fit directly onto a servo. Doing this has proved more difficult than I've expected so far. I was hoping to avoid incorporating the provided servo horns into the ...
2
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1answer
171 views

Using SLAM to create 2D topography

I have a small mobile robot with a LidarLite laser range finder attached to a servo. As of now I have the range finder side-sweeping in a 30 degree arc, taking continuous distance readings to the side ...
5
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2answers
2k views

Why can't you buy continuous servos with absolute positioning?

I've been looking at parts for a beginners robotics kit (I teach at a museum) and have been wondering about servos. You can buy continuous servos with relative position encoders. But I can't find ...
2
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2answers
124 views

How can I tell if a servo motor is capable of being controlled degree by degree?

I want to create a rotating control mechanism that can turn a surface to face any direction in a sphere. My dad (an electrical engineer) said I can probably do it by connecting two servo motors ...
2
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1answer
3k views

Type of servo and torque calculation required for a 2axis robot arm

I am trying to build a 2-axis robot arm with pan and tilt mechanism. The gripper/holder will hold an object weighing 300 grams. The total weight of the arm including the motors will be around 2 kg. I ...
1
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1answer
366 views

Driving a non-circular timing belt

I'd like to create a camera slider similar to this one. The only part I'm not sure on is how to setup the camera drive. It looks like I can buy a similar timing belt here, but I'm not sure how to ...
2
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1answer
3k views

Design and construction of universal robotic arm (5kg, 1m)

i am working on my master's thesis about design and construction of universal robotic arm. Goal of my work is to design 5 DOF robotic arm. Something like on the picture: I need it to be able to ...
5
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2answers
2k views

What type of servos are used in industrial robot arms like Universal Robot UR5?

I've noticed that the industrial robot arms have very smooth, fast, and strong movement. Does anyone know what type of servos they use. I'm trying to build my own and don't want to have the jerky ...
2
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1answer
678 views

Battery system for a robot with a RaspberryPi or microcontroller

I'm building a robot which is actually a rotating ball. All my circuitry will be inside this ball. I'm using a Raspberry Pi as the brains. Apart from Raspberry Pi, I've an H-bridge IC (L298N), a 6-...
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1answer
279 views

beaglebone black power supply for hexapod [duplicate]

I am trying to build a hexapod with camera interfacing using a beaglebone black for college project. I'm not sure what power supply to give so it can power up to bot, having in mind that it should be ...
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1answer
1k views

Connecting multiple servos to a robotic arm

I am computer programmer and it's really been long since I have done electronics. I need help on connecting my servos to an Arduino to power my robotic arm. This is the robotic arm that I am trying to ...
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1answer
77 views

Where do roboticists look for used sensors/hardware? [closed]

I recently built a self-driving vehicle-type robot for a competition, and am looking to sell sensors (GPS, INS, etc.) used in order to have money for the next project. Is ebay where people tend to go ...
1
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1answer
538 views

Servo controlled valve

I am trying to build a servo-controlled water valve. Max pressure 150 psi , valve size 1/2". Can anyone recommend a suitable 1/4-turn valve, either ceramic, ball valve, or anything else that is easy ...
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0answers
188 views

Raspberry Pi finer servo control

I'm usig RPI and Servoblaster to control servos. I've set the --step-size to 2 us, but I'd like to decrease it to 1us. I've tried to set the ...
3
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2answers
4k views

How Can I Measure the Torque Value of a Servo?

I know there must be a "tool" that can measure oz-in of torque. I do not want to trust what the servo manufacturers state on their site for torque values so I want to test them for myself. Anyone ...
6
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1answer
2k views

Unwanted Arduino reconnect: Servo + Arduino + Python (Raspberry Pi)

I am having difficulty sustaining a connection between my Raspberry Pi (Model B running Raspbian) and my Arduino (Uno) while sending signals from the Raspberry Pi to a continuously rotating servo (...
6
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1answer
224 views

Field oriented control of brushless motors

If I was controlling a normal brushed motor as a servo, I would measure the motor's position, and adjust the PWM signal to control the voltage. This way I could achieve a precise velocity/position ...
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0answers
786 views

Making a brushless servo using Hall sensors

I'd like to assemble a prototype of brushless servo system using a RC brushless motor (heavily geared down), a sensored Electronic Speed Controller for RC motors, and a microcontroller to do the PID ...
3
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1answer
769 views

Digital servo shaking

i need your advice if someone experienced something similar. I try using digital servo but when i tried to connect it to board by this tutorial https://blogs.oracle.com/hinkmond/entry/...
10
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2answers
2k views

Smooth servo movement for a crawling robot

I made a small crawler robot a little while ago that had two legs with two degrees of freedom each, so 4 RC servos total. While I was programming the movement of the legs I noticed that they moved ...
5
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3answers
97 views

Single power source for electronics and actuators

It seems popular to build robotic systems with separate supplies for the electronics and motors/servos, but what would be involved in a circuit that powers both from one source? If it helps, here is ...
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0answers
327 views

Pan and tilt bracket for a stepper motor [closed]

Currently, I'm using a pan tilt bracket that works with the servos I have (spark fun product 9065), and are generic to all servos. However, servos aren't accurate enough. I'm looking at other options, ...
10
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3answers
21k views

What are the signs that a servo might be broken?

I just got a kit and im not sure if its me or not but it appears one of the continuous servos might be broken. What happened first when I plugged it into the microcontroller, it made a humming sound ...
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3answers
332 views

What is the actual physical actuated quantity when controlling the position of a servo?

I'm trying to learn about servo control. I have seen that the most generic position control method for servos is PID, where the control input is position error. However, I am not sure about what is ...
14
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3answers
5k views

How is PIV control performed?

I'm considering experimenting with PIV control instead of PID control. Contrary to PID, PIV control has very little explanation on the internet and literature. There is almost a single source of ...
8
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5answers
3k views

Building a controllable “knob”

I am trying to build a semi-analog timer. Something like those old egg timers that you rotate the face of. I want a knob that I can turn that can be read by a microcontroller, and I also want the ...
8
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2answers
784 views

Getting started with robotic arm design

I would like to design a robotic arm to hold a weight X at length Y (in my case I want to hold X=2.5 lbs at Y = 4 inches). Starting out simply, I would like try building an arm with a gripper plus one ...
17
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3answers
2k views

What is the best way to power a large number (27) servos at 5 V?

I apologize if this question may sound a little vague. I am working on a robotics project that will contain 27 servos of various sizes and I am having trouble figuring it how they should be powered. ...
4
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2answers
890 views

Low-cost servo with digital control interfaces? [closed]

Some years ago, there where some projects that provided hardware and software to perform modifications on standard hobby servos to convert them to digital servos, with all the advantages that come ...
5
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2answers
4k views

Mechanical design for motorized spherical caster wheels

Design goal is to have a mobile robot that operates on 3 large casters, essentially 2 to 4 inch diameter steel ball bearings, that are motorized. No other mechanism would touch the surface. The robot ...
8
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2answers
736 views

Adding external heat sinking to a Dynamixel RX-24F servo?

Hobby servos are generally not sufficient for real robotics for a number of reasons: Quality, precision, range of motion, torque, etc. Meanwhile, industrial servos, such as ABB, Emerson, GE, etc, are ...