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Questions tagged [robotics]

This site no longer includes robotics in its topics. See the robotics stackexchange instead.

-1
votes
2answers
47 views

Can we prepare any ICs similar to decoder or demux , but for selecting multiple pins simultaneously?

It is possible to select the output pins sequentially using decoder or demux. But for selecting more than 2 output pins at same time, they don't work as the decoder /demux are single output selector ...
0
votes
2answers
62 views

Read Quadrature encoders over I2C bus

I need to add encoders to the 4 motors attached to a "remote" PCB. The remote PCB in question does not have microcontroller on it, but rather is connected to the microcontroller PCB with an I2C ...
0
votes
0answers
42 views

Robotic tool changer functionality

Have you any idea how is a changeable end-of-arm tool powered when is interfaced with an ATI tool changer or something similar ? My first thought is that on both sides of parts is a F/M connectors ...
0
votes
0answers
29 views

Using a single battery for robot motors and electronics

Instead of using two separate 12V SLA batteries (one for motor controllers*, one for Arduino, LEDs, sensors ...), would they work in series as one 24V battery, with a step-down converter for each ...
0
votes
1answer
70 views

Stepper Motors (NEMA-17) Won't Run When Wheels Are Attached

My team and I are creating a robot using 4 stepper motors with mecanum wheels and an Arduino Uno. The code appears to be correct, and the motors seem to run just fine on their own, but once we screw ...
0
votes
1answer
54 views

Turnigy servo motor needs push to start

I currently have an inspection robot deployed in a remote part of Africa that has a failing Turnigy TGY-6114MD servo. The issue started happening during normal operation and was working fine ...
0
votes
1answer
109 views

How to determine the angular velocity of a DC motor correctly

I am given a small robot track vehicle, which uses a DC motor to power the left tracked wheel and another DC motor to power the right tracked wheel. I am using an optical wheel encoder to measure the ...
0
votes
0answers
42 views

How to deal with specular reflections from ultrasonic distance sensors

I am currently challenged with the following problem: I am given an autonomous robot which uses the HC-SR04 ultrasonic distance sensor to determine its distance to the robot driving in front. ...
0
votes
1answer
115 views

Servo motors twitching , arduino Mega [closed]

I am working on a school project: a robotic arm controlled by an Arduino Mega board, 6 servo motors: https://hobbyking.com/en_us/power-hd-lw-20mg-servo.html?___store=en_us 1 PC power supply (450W), ...
0
votes
1answer
113 views

How to measure the angle of a rope on a moving airplane?

I've got a simple rc plane which I want to fly on a tether. The tether is attached to the bottom of the plane like this: I now want to know what the orientation of the rope on the bottom of the plane ...
0
votes
1answer
53 views

Looking for a very precise tx/rx circuit module to calculate distance [closed]

Thanks for helping. I'm looking for a system that will help me find exact distance between a transmitter and receiver at a frequency of milli seconds, in distance accuracy of milli meters. I want to ...
-2
votes
1answer
76 views

Battery Run-time/capacity calculation

Problem is to find the difference in run-time between: a. Using 12V 10Ah battery vs 24V 5Ah battery. PS: Load is rated at 12VDC and 24V to 12V step-down conversion is available.
-1
votes
1answer
50 views

CANopen CANmessage blocking

Is there a trick to block CAN messages from a specific device? I have to block some of CAN messages of my remote controller so that I can send my CAN messages via my Laptop. Otherwise my messages gets ...
2
votes
1answer
156 views

CAN bus reverse-engineering

I am struggling with CAN bus reverse-engineering. It might be a silly question, but it irritates me. These are traffics that arise from pressing buttons A and B which is lifting up the 1. Axis of the ...
2
votes
2answers
181 views

Is Axial Gap (pancake) motor better for servo drive applications?

I heard from someone that axial gap /pancake motors (lynch or etek) are better for servo control (speed and position) than standard radial flux DC motors. Both motors are brushed type. I don't ...
0
votes
4answers
203 views

CANopen transmission to multiple IDs at the same time

I am asking myself, whether it is possible that I simultaneously send multiple signals to my robot via CANopen. edit : I am trying to build a CANopen connection with my robot. I can turn the motor ...
0
votes
2answers
55 views

How to make servo rotate in a given range no matter how its placed in a chassis

I'm working on a humanoid robot project everything works but I have one issue. When I disassemble and then reassemble the joints, the servos will more than likely be placed in a different rotational ...
0
votes
1answer
56 views

AI and Linking it to a circuit [closed]

I have been building a robotic arm for a while now and finally got onto the actual coding side of things. I have been looking around the internet and I’m trying to build some AI code for the arm. ...
1
vote
0answers
83 views

How to improve AHRS algorithm

I'm currently working on a project with multiple IMUs mounted on moving vehicle estimating their pose. I've just read about AHRS algorithms. So I have two questions about them: Since my data is pre-...
1
vote
0answers
62 views

Designing Battery Power System For Robotics

I'm building a mobile robotics project for a class and I'm trying to figure out how to (or even if its necessary) to design a nice battery power system for it. I sort of wanted to learn how to build a ...
0
votes
1answer
289 views

Running 18 servo motors on a Hexapod

I am working on a hexapod robot that has 18 servo motors(HS-475HB). My problem is that when I use one servo, the current is about 0.7A at 6V (when moving the servo from its position), when I add ...
1
vote
2answers
195 views

How to create an auxiliary power supply [closed]

For our senior design we are designing an electric vehicle. The motor will run on 72v from li ion batteries but we have some auxiliary devices that we would like to power from the same battery. We ...
0
votes
2answers
2k views

Controlling the speed of servo?

I know how to control where the servo will rotate: if I send 1 ms duty signal in a PWM interval it will rotate clockwise and if I send 2ms duty signal it will rotate counter-clockwise but how can I ...
0
votes
1answer
51 views

Controlling a circuit board from my PC

I am planning for a project I want to make that involves a custom pcb. The board is fairly simple. It has a 4 bit input. But I need to do advanced calculations from my computer to determine what the ...
2
votes
1answer
89 views

DC motor characteristics and control

I don't have a lot of experience into detailed / calculated selection of DC motors based on their specs. Now, I'm starting to do it for robotics competitions as I'm progressing to more serious ones. ...
2
votes
1answer
168 views

servo selection for robotic arm [closed]

Hi i´m designing a robotic arm based on this idea of the NOVABOT I only want to change its structural parts by aluminum tubes. In this design 3D model it use the servo hs-311 wish have a max torque of ...
1
vote
1answer
202 views

Over-voltage protection for mini-computer

I am working on a mobile robot and have damaged 2 RPis as a result of what appears to be a transient over-voltage situation. Please see the attached drawing of the basic setup. The failure is not ...
0
votes
1answer
34 views

rc battery and connector issues when used in other applications

I purchased this battery for my robotics project and this charger along with it. Since the regular use for these types of batteries is for rc cars they have very specific connectors and so i am unable ...
3
votes
4answers
1k views

Using rotary encoders with no interrupt pins

I little background first.. I have 4 separate wheels in my robot and an encoder on each wheel. I am using an arduino mega 2560 which only has 6 interrupt pins, every code that I've seen either uses 2 ...
1
vote
1answer
450 views

Limiting starting current of a small DC motor

I have 4 12 V DC motors and I am using 11.2 V 2200 mAh LiPo batteries to drive them. They are part of an RF robot which depend on differential drive for turning hence I don't want to compromise on ...
3
votes
3answers
644 views

methods for servo or stepper synchronized multi-axis control [closed]

I have designed a 6 axis robot. The main requirement of the robot is that all axes must be highly synchronized in order to create precise (sub-millimeter, sub-degree) 6DOF (x, y, z, yaw, pitch, roll) ...
0
votes
1answer
2k views

Line follower robot using PID control

I'm using Arduino UNO for a pid line follower robot. The robot works great, but when it detects a T line, it deviates from the line. So I try to set the condition if all the sensors see black and then ...
0
votes
2answers
301 views

Weak and Cheap Linear Actuator? [closed]

I have a tiny tube that sprays lubricant but I need it to move between some holes in a line. The total distance is only 10 inches. So imagine the holes like this: ...
2
votes
3answers
183 views

why does absolute encoder (even multiturn) have the option of an additional incremental output

Many companies make absolute encoders for motor drives some can output an optional incremental track . my question is why is that needed since the encoder have a BiSS interface that can go as high as ...
0
votes
1answer
178 views

Is it possible move mouse cursors via IR pins?

In a mouse (with ball) there are IR sensors and phototransistor sensors (in pairs) to check the movement of the mouse in both axes. For each axis, there is the following configuration: http://...
0
votes
2answers
977 views

which stepper motor driver is best for robotic arm? [closed]

I am building a robot arm am using TB6560and datasheet,with stepper motor 17HS3001-20B datasheet. I have problem with the stop current setting i.e. when stop the driver tb6560 reduces current ...
0
votes
1answer
99 views

When I turn off a servo how much do torque I need to rotate it?

I'm designing the actuation of a throttle for an engine.I thought to put a servo to move the plate. Very interesting are the smart servos used for the robotics(for example dynamixel AX-12W http://www....
2
votes
1answer
102 views

Gesture controlled robotic arm

Can I use gryometers and accelerometers to map the movement of a human arm and then apply it on a robot? The idea that I have is to collect the data from multiple sensors using Raspberry Pi and ...
-5
votes
3answers
1k views

Alternatives to Arduino [closed]

The Arduino Microcontroller platform is great for hobbyists. But I was wondering if there is an alternative to it? I need to calculate the position and speed of the robot in a defined space using the ...
0
votes
3answers
141 views

I need a circuit that would stay on after being triggered

I am a year one electrical engineering student, and I am currently doing a project about building an electrical robot car. One of the required features of the car is to add a front sensor to the front,...
0
votes
1answer
85 views

lithium ion battery queries

I am currently looking at this battery: http://www.ebay.com/itm/DC-12V-1800mAh-Super-Rechargeable-Pack-Protable-Li-ion-Battery-EU-Plug-For-CCTV-/400940782911?hash=item5d59eed53f:g:mxwAAOSw5dNWj4Bn I ...
0
votes
0answers
160 views

Optocoupler to remove signal noise

So I've got a Sabertooth 2x5 motor driver. I uses standard servo connections, and a micro controller can use standard servo arguments to make the motors go in forward or reverse (much like a continous ...
1
vote
1answer
163 views

How to calculate required voltage + amperage for a linear servo array?

I would like to control a set of 10 Linear actuators for a robotics project. The actuators require: 3.7VDC operating voltage 150mA unloaded travelling current draw 450mA stalled current ...
1
vote
3answers
72 views

Running 100 24v 1 amp solenoids with low amperage power supply

I am trying to run around 100 24v solenoids with a low amperage power supply. I originally thought when I began trying to run the solenoids I would go with a 100 amp power supply as each solenoid is ...
0
votes
1answer
93 views

Transducers versus Sensors - applied to mobile robotics

I am doing some basic research for an upcoming personal project, learning everything I can relate to mobile robotics. This project will be used for my personal portfolio. So, my questions are very ...
2
votes
1answer
342 views

Substitute for the PNP D45H11 transistor? [closed]

I'm starting the course on edX: "Introduction to Control System Design-Computational State Space Approaches" Link: (https://www.edx.org/course/introduction-state-space-control-mitx-6-302-1x). The ...
1
vote
1answer
891 views

Step/Dir input Servo Drive: how does it work internally compared to a serial input drive

I believe that the most common type of servo drives are based on STEP/Direction input which is inherited from the Stepper motor controllers. My question is how does the type of controller work ...
-2
votes
1answer
138 views

Problem of detecting very close objects by SRF05 Ultrasonic sensor

I'm using SRF05 for distance measurement, but the major problem is that this module will not differ a very close object and no object. So its impossible to say ...
2
votes
2answers
799 views

3.3V input to 5V output for motor control

I wanted to connect my DC motor to raspberry PI and control it with PWM pin. Problem is that gpio pins are 3.3V in PI and I have pololu 10:1 DC motor which I would like to run on 5V(to make it faster)....
0
votes
1answer
266 views

Symbol on silk screen of design

This is the circuit diagram I used to make my line follower robot. I don't understand the symbol at the right side down corner, the one that is a circle with 3 dots inside. As this is my first PCB ...