# All Questions

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### MPU-6050 + Arduino nano - Logic converter or not? [closed]

I bought this MPU-6050: link According to the manufacture site, the sensor logic level is 3.3V (though the ebay page says Power supply :3-5v) Should I use a 4 ...
2k views

### Help with PID “units” in a quadcopter control system

I'm in the process of writing my own simple quadcopter controller for experimental use, and I'm having trouble getting my head around how to convert from the degrees which my PID controller demands to ...
176 views

### Do 6 motors require 6 individually-assigned batteries?

For the Dagu Wild Thumper 6 Wheeled platform, or any multiple motor system, do I really need 1 battery for each motor? Or should I just buy 2 for either side of the platform. In addition, for larger ...
3k views

### Can GPS modules work inside plastic enclosures?

I'm going to be embarking on an autonomous robot project and I was going to be using GPS to navigate to waypoints (I'm aware of the margin of error when it comes to localization with GPD but I live in ...
161 views

### Wind force impact on torque mechanical arm

I've got an arm attached to a shaft. The arms dimensions are 40x5 inches the arm weights about 10 lbs. If I have a wind acting on the side of the arm, how would I translate the wind force into torque ...
240 views

### Does a vehicle with defferential gear still move straight?

I am in the concept phase of a driving robot. The two wheels on the front axle will be powered, while the rear will be dragged along. The rear is also responsible for steering but this has noting to ...
125 views

### Management of asynchronous commands

I am working on a robotics project with C++ (drawing signs on board), on CRS CataLyst5 arm. I have faced a problem: I have many methods move in different directions, goToLocalizations, etc, but the ...
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 ...
116 views

### funny behaviour or what - dc motor control

I'm trying to control the speed of this motor, with this motor driver and pic16f690. pwm in my program 5 kHz frequency (0.2 ms period) Starting with 50% duty ...
210 views

### Moldable rubber for “feet”

I’m trying to inject some kind of rubber around an aluminum strut to form “feet” for a robot. I’ve already milled the mold, but I’m having trouble finding an inexpensive and readily available rubber ...
170 views

### classify if two adjacent surfaces belong to same object

I have a box (cuboid) lying on floor or table. So there are 6 surfaces of the box and 1 surface of the floor. If I take each pair of surface such that the surfaces are "adjacent" to each other, I get ...
819 views

### How to protect the milk in a homemade vending machine?

I am working on a homemade vending machine project that serves milk and cookies, using arduino and some basic servos and stuff. The problem is: I really have no clue on how to protect the milk to ...
445 views

### Implementing Slip Compensation into a Half-Size Micromouse

I would like to know if there are any other solutions to implement slip compensation into a Half-Size Micromouse other than the conventional method. I have spoken to a few Japanese competitors, and ...
20k views

### What is the difference between a Robot and a Machine?

What is the difference between a Robot and a Machine? At what point does a machine begin to be called a robot? Is it at a certain level of complexity? Is it when it has software etc?. For instance: ...
12k views

### Calculate position of differential drive robot

How do you calculate or update the position of a differential drive robot with incremental sensors? There is one incremental sensor attatched to each of the two differential wheels. Both sensors ...
1k views

### How can I manipulate real-time sonar data from my Arducopter in Arduino?

I have a APM 3DR Quad with a 3DR radio telemetry kit. I would like to send real-time sonar data to my laptop (running Windows 7) in order to manipulate it in an additional Arduino Sketch. The ...
31 views

### What is rotor torque? [duplicate]

On my stepper's datasheet, it has the category "rotor torque" (labeled in N-CM). What does that mean? Is this the torque it has can supply when turning? (Hopefully)
1k views

### How to speed up robotic arm?

I need my robotic arm to ring a desk bell. I one on the maplins site usb robotic arm. It does seem very slow. What can I hack on it to boost the downwards and upwards speed. I need it hit the bell ...
281 views

### WHY are there no operating torque specifications on steppers?

I have been looking online for a while, and I cannot seem to find any steppers without any torque ratings. (Operating torque, not holding torque.) I even looked on hobby sites that usually have all ...
229 views

### Paper work before I do make my own Line follower Robot [closed]

I am a graduate student trying to make my own Line follower Robot for my minor assessment, I've all hardware parts and all data-sheets with me, I've attended a workshops of Robotics and studied a lot ...
426 views

### How to control velocity ratio when turning angle is θ?

Im designing a differential steering mechanism for my robot. Supposing my robot is going in a straight line and I want it to change it direction by a certain angle( $θ$ in the diagram). What should ...
1k views

### How can I get data from my kinect?

Whenever I try using openni_launch, it works normally, however, when I try viewing an image using the kinect's rgb or depth camera, or even recording a simple ...
1k views

### Controlling a conveyor belt with a time based motor

I have some crude time based motors taken from a robot arm that we upgraded to proper servos. I want to be able to power a conveyor belt with one of them and I was wondering how I would go about the ...
21k views

### Why do quadcopters use brushless motors

I've been thinking about starting a quadcopter project, maybe building it from scratch. One of the main barriers-to-entry for me is the motors: it seems like most quadcopters use brushless motors. I ...
2k views

### Beaglebone Black power draw [closed]

What is the minimum amount of power that a beaglebone needs to start up? This would be with no peripherals attached besides host usb. The getting started guide claims that it can run off of a ...
6k views

### How do I motorize the elbow socket and other joints in a powered exo-skeleton?

How would you motorize the joints in an Iron Man suit? You need something fairly shallow, I would think, probably dual servos sitting on either side of an elbow or knee joint or either side of your ...
221 views

### Why can Humans single out audio in a crowd? What would it take for a robot to do the same?

I was at a Robotics conference earlier today and one of the speakers mentioned robots not being able to function as well in a crowd because they can't single out audio like a person can. Why can ...
606 views

### ArduIMU noisy output in Quadrotor

We are using ArduIMU (V3) as our Quadrotor's inertial measurement unit. (we have a separate board to control all motors, not with ArduIMU itself). Now we have a problem with ArduIMU's sensors output....
183 views

### Motor driver selection

I am building a 2 wheel robot to carry 7KG of load. I used this link to get the torque required for each motor which is 11Kg-cm. So I choose 2 of these motor which has 36Kg-cm(2x more) torque. I ...
350 views

### How to make a motion sensor circuit, that can communicate with my LAN? [closed]

I'm a newbie to Electronics/ Robotics, but I love to do it as a hobby. So I want to build a circuit (a really small in size would be much better) with a motion sensor that can communicate data (...
192 views

### Do servos stop at their limits automatically?

I'm moving from controlling a robot arm with basic time based motors controlled using a raspberry pi and python to a more advanced robotic arm that has servos (e.g HS-425BB). With the time based ...
2k views

### How to implement the Wavefront algorithm

I am thinking of creating a robot that can navigate using a map. It is controlled from a PC. An 8-bit controller performs low level tasks and the PC is doing the image processing. I plan to implement ...
3k views

### How to design a differential steering mechanism?

I want to give my robot a differential mechanism for the system of turning and steering. Considering the case of turning a right-angled corner, the robot will achieve this by following a gradual ...
572 views

### Making a robotic arm that can draw a circle [closed]

I am software engineering student and don't know much about hardware. I recently have started a project in my AI course. The project is playing a 3x3 tic-tac-toe game between computer and a human. ...
144 views

### measuring gears for servo motors

I'm quite new to mechanical engineering and not familiar with gears and motors. A few days ago, I bought a second-hand GWS servo motor for my project, and it didn't include gears. Can someone help me ...
3k views

### What is the name for the transfer function, GH

What is the name for the transfer function, GH, in a simple feedback control system like $$y=\frac{G}{1+GH}u$$ What do you call G? What about (G/(1+GH))? I am confused by the fact that that "open-...
140 views

### existence probability of an object in fusion

I want to compute an existence probability of an object in a sensor fusion on the high level (having from each sensor list of objects already filtered with e.g. Kalman Filter). There are these ...
3k views

### How to deal with sonar crosstalk

Our robot has a circular array of 12 sonar sensors that looks like this: The sonar sensors themselves are pretty good. We use a low-pass filter to deal with noise, and the readings seem pretty ...
2k views

### Interference between 900 MHz video transmitter and 2.4 GHz control radio

I'm starting to attempt to fly FPV on my quadrotor. I am using a FrSky D8R-II 2.4 GHz frequency hopping diversity receiver (two antennas) for control and recently added a no-name 910 MHz 1.5 watt ...
360 views

### Choosing motor and battery for a robot

I have a project which requires a robot to move around a room with a flat surface (concrete floor). The robot must carry a laptop. I estimated that the total weight would be 6-7kg (including motors, ...
2k views

### Accelerometer calibration - how to get cross-axis sensitivities

I've already asked a related question (accelerometer bias removal) here on robotics and got a bit better results on corrected accelerometer output. To get even better results I found the calibration ...
1k views

### How to raise/drop a spider

For Halloween, I'd like to build a spider that drops from the ceiling when it detects motion, and then rewinds itself back up to scare the next kids. I already have a lightweight foamish spider from ...
3k views

### Accelerometer bias removal

I found a good explanation on how to remove accelerometer bias (when on flat table only one axis should show values, the other two should be 0). I've calculated S and B factors (page 3): Record \$...
2k views

### H-bridges and stall current

For a DC motor with a stall current of 950 mA, what should the H-bridge's current rating be? What will happen if we use our H-bridge L293D whose max. output current is 600 mA?
712 views

### Roslaunch include file remotely

I am trying to launch a file from remote computer but I could not success. Actually I can connect to remote computer but I think the problem is with including a file from remote computer. In other ...
509 views

### If you can create pure yaw motion with a quadcoptor then why won't this work with a tricoptor?

An answer to the question Why are quadcopters more common in robotics than other configurations? said: You need 4 degrees of freedom to control yaw, pitch, roll and thrust. Four props is ...
8k views

### Track a moving object

If this has already been answered, by all means please point me to it. I am in the process of building a quadcopter which I eventually plan to run autonomously by allowing it to track an object and ...
2k views

Hy, I just found useful to post my idea here. I've seen videos about automated quadcopters: http://www.ted.com/talks/raffaello_d_andrea_the_astounding_athletic_power_of_quadcopters.html and http://...