Questions tagged [robotics]

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Best way to provide 5V at a high current to power 12+ servos using battery power

I am currently in the process of building a quadruped robot that uses 12 SG90 servos, controlled by a PCA9685, for motion. I've found many examples of quadrupeds, but barely any mention of their power ...
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Can i use ESP32 3.3V pwm on MG90D Servo

Ok so, im building the eletronical part of a sumo robot for my university team, and i came to a barrier, on past researchs we came to the conclusion that using MG90D servo is the best option for us (...
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-1 votes
1 answer
36 views

How to do sound localisation for an Inmoov Robot

I have to do sound localisation for a humanoid robot. This is my final year project given by our sir but I have no idea how to do it can anyone help me
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-1 votes
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MOSFET motor driver burns up with battery [closed]

I am working on a robot. I have used a MOSFET bridge to drive the motors. The problem is that when I test the motor drive using a power supply the circuit works fine without any problem but when I ...
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0 votes
1 answer
34 views

Sensor to detect collision or intervention

I am currently working on a project (robotic arm) where I need to detect human collision with the robot. I need a sensor that should be flexible, detect human intervention in the workspace of the ...
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0 votes
1 answer
54 views

Power supplying in robotics

I am experiencing an unstable power situation in my robot. My computer (Jetson AGX) and the lights (48 neopixel leds) are powered by the same source (https://www.mini-box.com/DCDC-NUC), which is in ...
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1 vote
1 answer
71 views

How to calculate the rated speed of a DC motor given the no load speed, rated current and rated torque?

I am working on a mobile robotics project and I'm beginning to learn about DC motors. I am looking at a particular geared motor, and the given parameters are the no load speed, the rated torque, rated ...
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1 answer
133 views

How to limit current output to 1A from 12V lithium ion battery

We are making a simple bot that uses a 12 V lithium ion battery,which is connected to a power module, for 5V and 3.3 V output. Now I connect a TB6612FNG motor driver with ESP32. The ESP32 is powered ...
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1 vote
1 answer
562 views

MG996R that can rotate all the way around, but behaves like a normal servo

So I bought an MG996r online to replace a dead one in my robot dog, and I always test my new servos by hand and then by using sweep. When testing this one by hand, I found that I could turn it all the ...
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1 vote
1 answer
87 views

Why can't the HC-SR04 sensor detect objects that are very close to it?

I am following this worksheet and I am struggling to understand the following piece of code: ...
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  • 141
0 votes
3 answers
57 views

How to get started knowing how to power my robot? [closed]

I have been a software engineer for many years writing code for websites/servers etc. I recently became intrigued with the idea of building land drones. I have decided to build a small tank that has a ...
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  • 101
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2 answers
93 views

Resources on multi-MCU architecture?

I am designing a 6-axis robot arm, and I just finished tuning the control algorithm for a single BLDC using a STM32 MCU. The next step led me to wonder how such system usually works: I don't think my ...
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1 answer
151 views

PCB pancake slip ring brushes [closed]

I am designing a mechanical attitude indicator for the avionics simulator. I need a pancake slip ring, that drives servo (max 500mA at 5V) and some backlight. My idea is to use a gold-plated PCB and ...
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0 votes
1 answer
125 views

I have a 5 volt converter but I also need 3.3 volts, what should I do?

Goal is to get 5V and 3.3 V output by the use of a buck/boost converter. Important is to use a converter instead of an LDO for heat reasons. I want to draw minimum above 0.8A, preferably 1-1.2A at the ...
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3 votes
2 answers
190 views

What type of electronics is typically used to interface between PCs and custom hardware? [closed]

I have tried to make this question acceptable for StackExchange, I am not looking for buying advice, just either examples of hardware that could have been used or the name of types of devices I should ...
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0 answers
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PID Control: Is adding a delay before the next loop a good idea?

I am implementing PID control in c++ to make a differential drive robot turn an accurate number of degrees, but I am having many issues. Exiting control loop early due to fast loop runtime If the ...
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0 votes
0 answers
140 views

How to run encoder motor with motor driver and raspberry pi

I am kinda new to the Robotics field and Raspberry Pi and has worked on very basic projects with the hardware so far. My current task is to run the "Encoder Motor" with a motor driver(...
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0 answers
38 views

Axis of Euler rotation matrix

I'm searching the way to measure rotational displacement by using Euler rotational matrix. And I could find various information about it. Then I've found something wrong with reference axis. In the ...
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0 votes
1 answer
167 views

Drive a DC Motor with a WS2811 chip

I'm building a robot that needs a lot of small hobby motors (or similar) to operate in sync. I was looking for ways to have as many of them controlled by a single source of truth as I am not sure I ...
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0 votes
1 answer
45 views

Controlling esp2886 via bluetooth... help!

I am trying to control my esp2866 via bluetooth so I bought a DSD TECH SH-M08 Bluetooth 4.0 BLE Module. In a tutorial I saw they paired it to the computer and then under 'More Bluetooth Options', in ...
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  • 41
1 vote
3 answers
179 views

Finding distance travelled by differential drive robot

In a two wheeled differential drive robot, with wheel radius 7cm. bot starts from rest and the two motors are randomly actuated. Left wheel has rotated by 270 degrees, and the right wheel rotates by ...
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4 votes
1 answer
52 views

Mechanisms of a mobile robot

what is the need of the upper wheels in the figure shown?
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  • 141
2 votes
0 answers
43 views

Accurate localization through GPS, IMU and odometry

I am trying to localize a robot with an error <1m. I have XA1110 GPS but haven't tested it in an open area (due to the ongoing disaster) hence I am unaware of its practically achievable accuracy. I ...
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1 vote
2 answers
239 views

5V 4A power supply for simple circuit

I am a 14 year old electronics noob. I am mostly a programmer and mechanical designer. I have been working on a robot which needs around 4 amps of current. I am thinking about using a simple 5V 4A AC ...
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1 vote
1 answer
23 views

Bluetooth not connecting error

I am making and robotic arm by using arduino and hc - 05 module and controlling that arm using mobile application now problem what i am facing is the mobile app dose not connect to bluetooth device ...
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0 votes
1 answer
114 views

Problem with the pulses given by the motor encoder

I'm experimenting with differential encoder and I have some questions now. First specs: motor reduction is 14:1 on official page, encoder count 512 pulses per revolution so that mean that on one full ...
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0 votes
2 answers
88 views

Design decisions about computational hardware for small mechatronics project [closed]

I've recently started learning electronics/mechatronics. As part of my studies, I've been reading about devices such as RaspberryPi, Arduino, etc, and I'm interested in experimenting with such devices....
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2 answers
128 views

Making a super efficient line following robot that runs on super capacitors for as long as possible [closed]

I'm trying to make a line following robot that runs for at least 20 seconds on a 2F super capacitor (5x 2.7V 10F super capacitors in series with protection circuits.) So I'm working with 13.5V and 182 ...
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1 vote
1 answer
174 views

How to get constant 5v power supply when using same power supply for motors & micro controllers

I have made a wifi controlled car using nodemcu. It works fine if I connect nodemcu to a separate 5v supply. But if I use the same power supply for both the motors and nodemcu, it resets ...
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0 votes
2 answers
324 views

What is the best way to solder a large flat SMD shunt resistor so as to minimize joint resistance?

I have a BLDC motor controller that uses a high side 0.001 ohm current sense resistor (CSS2H-5930K-1L00F) and a MAX40201FAUA (50 V/V) to measure the current during motor operation via a Teensy 3.6 ADC....
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0 votes
1 answer
34 views

RC servo suitable for robot arm or not

As you see many product and open source using RC servo to build small robot arm. This question might simple but I think it important to someone that want to build robot arm and decide which type of ...
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1 vote
1 answer
400 views

Brushless motor control poisition (design own PID?)

I got a few motor similar to the image below from a old scanner and I want to apply them in a robotic arm to move the arm because BLDC motors have a large torque I then control with arduino. Well, in ...
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1 vote
1 answer
50 views

How can I design a light-weight, on-board battery & charging system for a self-charging robot?

My project involves the robot navigating to its charging station, docking, charging, then resuming whatever it was doing. The robot is a hexapod with 18 leg motors, 2 camera motors, and will be ...
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0 votes
1 answer
163 views

Driving an Adafruit motor shield and a bluetooth module with Arduino Uno

I am creating a simple 4 wheel robot (BO Motors 200 RPM) with Adafruit Motor Shield and Arduino Uno V3. I am trying to use a Bluetooth module to control the robot. However, unlike Mega, I do not have ...
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0 votes
0 answers
173 views

Calibrating FEETECH FR5311M Digital Servo

Hey everyone, I am owning this model feetch servo motor. I want to do the following:(with arduino uno) Read the initial position(angle) of the servo motor rotate the motor to desired position(angle) ...
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0 votes
3 answers
734 views

How do I use multiple GY-521, I2C sensor with Arduino?

I'm working on an Arduino robotics project that requires I find the position of 12 different angles (I'm making a walking scale model of the Star Wars AT-AT and need to measure the angle of three ...
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1 vote
1 answer
83 views

How does a servo amplifier with Step/Dir Interface calculate feed-forward terms?

My Question is related only to servo systems that still use step/dir as input. Consider a typical advanced servo loop of an amplifier in the figure below: (source: "Mechatronics system Control and ...
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0 votes
2 answers
39 views

How can I reduce the speed of motors with given battery voltage?

I'm new to building line followers. I'm using ARDUINO UNO and a motor shield for accomplishing this task and for the power supply, I'm using a 12V Li-Po battery along with 2 300 rpm motors. The ...
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2 votes
3 answers
384 views

Driving two MOSFETs with one AND Gate?

I am designing a circuit to drive the brakes on a DC motor. The brakes are a 19.9Ω coil that is disabled when energized (think wheelchair motor style brakes). The brakes work on 24VDC. I have found ...
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1 vote
2 answers
82 views

Sensor to focus a robot on a welding line. (PLC robotics)

I'm searching for a way to recognize a welding line in an area. When the line is recognized, a small robot needs to follow the line. I searched the web already and spoke with some sensor suppliers. ...
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1 vote
0 answers
580 views

Designing a 4053 IC robotic control circuit for interfacing with Sabertooth motor controller?

I am designing a control circuit for a robot and was recommended to use a 4053 IC to achieve analogue multiplexing. PROBLEM The Sabertooth 2x60 motor controller I am using is running in analog ...
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0 votes
2 answers
131 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 ...
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1 vote
2 answers
2k 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 ...
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  • 405
0 votes
0 answers
43 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 ...
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1 vote
1 answer
243 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 ...
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0 votes
1 answer
187 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 ...
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0 votes
2 answers
982 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 ...
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0 votes
1 answer
627 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), ...
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0 votes
1 answer
175 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 ...
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  • 475
0 votes
1 answer
58 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 ...
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