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Questions tagged [robotics]

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

0
votes
1answer
20 views

Servo motors twitching , arduino Mega

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
102 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
49 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 ...
-1
votes
1answer
56 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
46 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
121 views

CANbus reverse-engineering

I am struggling with CANbus reverse-engineering. It might be a silly question but it irritates me. These are traffics that arisen from pressing buttons A and B which is lifting up the 1. Axis of the ...
2
votes
2answers
152 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
162 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
51 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
54 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
47 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-...
0
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0answers
36 views

BLDC soft stop methods

Looking for a method to softly stop a BLDC. I have a 20v dewalt drill controller, motor, gear reduction driving a mechanical device with chain drive. I dont have access to the controllers internal ...
1
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0answers
49 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
215 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
189 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
705 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
48 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
71 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
128 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
166 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
775 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
319 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
492 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
222 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
132 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
162 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
836 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
94 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
97 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
997 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
139 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
84 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
135 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
114 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
69 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
83 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
286 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 ...
0
votes
0answers
45 views

Charging device's batteries while using it [duplicate]

I'm new to electronics, and I'm building a WiFi-controlled tank, based on Raspberry Pi. I managed to complete it, but there's a thing that I can't improve without help. I want to found a way to charge ...
1
vote
1answer
739 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
129 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
645 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
232 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 ...
3
votes
3answers
1k views

Interference from motors on PWM signal

Am building myself a robot chasis that is RC controlled. There is an RC receiver attached in solution and I have a remote RC transmitter. When the motors are not running, I get a perfectly clean ...
0
votes
3answers
550 views

h bridge leaking current?

I have built an H-bridge with the following schematic. My motor controls a wheel that I want to turn backwards and forwards. The voltages to the bases of the BJTs are supplied by an Arduino. the ...
0
votes
2answers
236 views

is soldering necessary for a robotics and electronics hobbyist?

I know it is VERY common but I am worried about the exposure. I do understand it is minimal if an extraction device is used to get rid of the gasses and if a lead-free solder is used but I ...
0
votes
1answer
113 views

How to connect absolute encoder on the rotating shaft. Please see the three options?

Hi, Here I have added 2 options for connecting encoder on shaft. Motor, gearhead and shaft is connected using coupling. But where will be best place for encoder (To avoid backlash from coupling and ...
-2
votes
1answer
267 views

driving 10A motor [closed]

I have made a wireless robot with ht12d/e and l293 ic and i have used two type of motors. first motor(plastic geared) was working ok with l293(i.e it was working at 1A) second motor(johnson geared ...
3
votes
1answer
482 views

Stepper vs servo or DC motor

My friend and I are currently working on a robotic vehicle project, and he had some spare steppers lying around from a previous project. Instead of using DC motors or servo motors, is it viably to use ...