Questions tagged [robotics]

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1answer
47 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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2answers
79 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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2answers
81 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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0answers
41 views

Specific Type Of Toggle Switch

I’m needing help finding/naming a specific type of on/off toggle switch, but can’t seem to find it by googling. Basically, I want a toggle switch like in the picture below that I can use to power on ...
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1answer
70 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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2answers
87 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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1answer
22 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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1answer
66 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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1answer
41 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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0answers
34 views

Smart Li-Pol battery for DIY self-driving robot

I want to build a self-driving robot. The main idea is to build it as autonomous as possible. I've chosen Raspberry PI board as a main controller and L298N as a motors driver. I need a battery to ...
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0answers
17 views

When I implement a slam algo how do I navigate the created slam map?

I am trying to make an AMR(Autonomous Mobile Robot) for a woodworking shop. The goal is just to get the robot to move a pallet from point A to point B. The environment is relatively busy so I wanted ...
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1answer
26 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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0answers
59 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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0answers
43 views

Dual rail power supply

I'm currently working on a robotics project and I need to convert a 12V DC input to +3V, -3V and 12V outputs. The +/-3V is used to power motors in two directions. The 12V is used to power relays that ...
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3answers
259 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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1answer
41 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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2answers
37 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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3answers
101 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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2answers
74 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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0answers
246 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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2answers
83 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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2answers
825 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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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 ...
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1answer
145 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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1answer
100 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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2answers
474 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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1answer
219 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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1answer
131 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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1answer
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 ...
-2
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1answer
114 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.
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1answer
108 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
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1answer
241 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
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2answers
233 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 ...
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4answers
348 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 up ...
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2answers
60 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
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1answer
62 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. ...
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0answers
91 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-...
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0answers
93 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 ...
-1
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1answer
383 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
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2answers
221 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
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2answers
4k 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
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1answer
54 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
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1answer
134 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
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1answer
246 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
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1answer
252 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
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1answer
37 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
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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
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1answer
546 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
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3answers
797 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) ...
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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 ...

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