Robotics Stack Exchange
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What actuator types exist that remain locked in their last position like hydraulic piston?

I would like to find an electronic actuator that mimics the characteristics of a hydraulic actuator, in that the position remains fixed without power drain when the actuator is not moving. Which actuators exist that match these criteria?
Mr. Developerdude
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How do I choose the best filter for dead reckoning with an IMU?

I'm searching filter to reduce noise and smooth the signal while dead reckoning with an IMU (6dof gyro+accelerometer). What are the differences/advantages/disadvantages of the following filters: Kalman Complementary moving average Mahony I…
acs
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Mapping formats for small autonomous robots

I have some robot software I'm working on (Java on Android) which needs to store a pre-designed map of a playing field to be able to navigate around. The field's not got any fancy 3d structure, the map can be 2d. I've been trying to find a good…
Liam Marshall
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4 answers

Arduino original or generic for a beginner?

I'm new to the robotics and electronics world, but I'm willing to dive into it. I'm a software developer and I want to create a project that uses GPS and Accelerometer data to show as a layer on Google Maps after transferred to PC. My doubt is about…
Fabiano Araujo
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Using 2x UARTs on STM32F072RB

I am trying to use 2x UARTs with ChibiOS on the STM32F072RB Nucleo Board. I initialized UART2 but I am still getting output on UART1 pins, which is totally weird. #include "ch.h" #include "hal.h" /* * UART driver configuration structure. …
user2967920
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DH-Parameters for Forward Kinematics for Translatory Motion only

I am fairly new to the DH-transformation and I have difficulties to understand how it works. Why are not all coordinates (X+Y+Z) incorporated into the parameters? It seems to me that at least one information is useless/goes to the trash, since there…
dcpria
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On-board monocular odometry for quadcopter stabilization

Has anyone done this with EKF/PID on a small microcontroller? Or know of code snippets to help implementing this?
thelorax1
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Calculate required motor torque through Harmonic Drive

I have a term project which is controlling a two-link manipulator with harmonic drive installed at each joint. To control, i used Computed control method to determine the torque needed for each joints based on the formula: $$\tau_i…
Phan
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How many amps do I want my Switching BEC to provide?

I'm trying to power 7-12 servos, and I was under the impression that each one would need about an amp, but in looking around for an appropriate BEC to supply them, I notice that most seem to output around 1-3.5 amps. They won't all be running at…
Khrob
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Can I control more than 18 servo motor with a Raspberry Pi

I'm trying to make an hexapod with 18 servo motors and i'm asking how to control them with a Raspberry Pi. (Never used it). I saw lot's of stuff to control 1, but 18, 20... Currently I'm working on an Arduino Mega, and a SSC-32 board, but I found…
Arthur
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Human arm inverse kinematics

Hi I want to implement an human arm robot and a task such as moving a glass between two points using Robotic Toolbox for Matlab by Peter Coorke. I'm a student and I'm a newbie in this kind of things so I would find a good reference for solving the…
Daniel
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Quadcopter PID output and duty cycle conversion

I'm trying to design two PD controllers to control the roll and pitch angle of my quadcopter and a P controller to control the yaw rate. I give to the system the reference roll, pitch and yaw rate from a smartphone controller (with WiFi).In the case…
Daniel
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3D scanner from Phone Camera

123D software can construct a 3D model from photos taken from your phone. It doesn't process the photos in your phone. Instead, it sends them to the cloud to create 3d model. How can i construct a 3d model like this (only with one camera)? I…
acs
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Determine the configuration space for a robotic arm

I'm working with a 4DOF Parallel-Mechanism arm. I'm interested in writing planners for this arm (PRM or RRT) in the configuration space, but I'm not sure how to identify obstacles/collisions. When writing planners for mobile robots in a 2d…
asriraman93
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Suggestion for a camera

Are there good low cost cameras that are frequently used in robotics? I am assuming there are cameras that are good fit for robotics ... Works well with OpenCV PC Windows support - USB2/USB3 (GigE, USB3 vision cameras seem pricey) Good image…
Ali
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