Questions tagged [robotics]
This site no longer includes robotics in its topics. See the robotics stackexchange instead.
252
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Using both safety PLC and safety relay
I am in the process of designing a robotic cell. This contains a safety door and several e-stops. I want to use the safety PLC from siemens S7-1200F. I need to have two roller tracks with 8 24V motors ...
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Simulating Gyroscope with ARW, BI, and Spectral Density Using Physical IMU Data
I'm currently working on a state estimation project that relies on IMU data. While I have access to a physical IMU, I'd like to simulate gyroscope data with specific parameters, including Angle Random ...
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96
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Dynamic model of three dof to state space?
I´m trying to convert a 3 dof robot manipulator from dynamic model to state space. I saw a video where explains how to convert a 2 dof robot manipulator, but I don´t know how to apply it to a 3 dof ...
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Will running four motors (two high speed and two high torque) get the robot rolling? [closed]
I've been building a 2WD robot for 3 months now and been switching the motors frequently and been running into the same issue - low torque.
I had these low RPM, high torque motors around and thought: ...
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62
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Connecting computer and motor driver grounds
I am designing a robotic system and seem to be having a ground issue whilst working with motor drivers.
To improve system stability and for EMI concerns, I have split the power and signal using an ...
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81
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Coding Help: Blender to Arduino over Serial Port
Working on a connecting an Arduino Uno to Blender 3.4 over the serial port. In the Blender file, I have an object named "motor1", a simple cube that can be manually rotated in the 3d ...
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1
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29
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Module for "Force Control" [closed]
I am looking for a device (e.g motor) for an Arduino or Raspberry which can change its force. You can imagine it as a servo but instead of controlling it through positioning it is controlled with &...
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247
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Can a BLDC motor still provide max torque for holding position when I run it at 24 V instead of 48 V?
I would like to do a Leg Robot project.
I have an AK80-64 BLDC motor from T-motor. The specification says it can be operated at 24 and 48 V.
Can the BLDC motor still provide max. torque for holding ...
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3
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112
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Detection device for robots [closed]
I am an electrical engineering student and I have been in robotics since 2019. I want to create my own robots and I need advise on a detection device.
Context :
The match happens on a 1m×2m table, 2 ...
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141
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Maximum weight for robot arm - MG996R [closed]
I want to build a robot arm (see here) to move a dumbbell of 2 kg (roughly 2.2 lbs).
However, since I have no background in engineering, I have no idea how to calculate / find out if the servos used (...
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1
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196
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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
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52
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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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86
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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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1
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50
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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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1
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103
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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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1k
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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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241
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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
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2k
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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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315
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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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3
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76
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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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2
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129
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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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310
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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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185
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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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2
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219
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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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66
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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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219
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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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55
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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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1
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299
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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 logic as I am not sure I ...
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52
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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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3
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381
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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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83
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2
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85
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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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2
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343
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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
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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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210
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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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96
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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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239
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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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How to get a constant 5 V power supply when using the same power supply for motors and micro controllers
I have made a WiFi controlled car using NodeMCU. It works fine if I connect the NodeMCU to a separate 5 V supply.
If I use the same power supply for both the motors and the NodeMCU, it resets ...
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2
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565
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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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64
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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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784
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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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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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304
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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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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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3
answers
1k
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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
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155
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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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2
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39
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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 ...
2
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3
answers
963
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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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2
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93
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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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