Let's Make Robots!


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Pin type force sensor?

I am using a linear actuator, that has an acme screw type of actuator.  It will be used to apply up to 400 lbs of force to a gripper mechanism.  I want to sense the force at the end of the actuator, which has a 3/8" dia rod-end type of connection, using a clevis pin.  Ideally, it would have a 0-5v output for easy interfacing to an Arduino.

I have found clevis-pin type of strain sensors, but they seem to be  very expensive. One was $900, and I need 3.

My first robot: I need some help..

Hello everybody!


I'm an Italian twenty-something guy with a necessity to build a robotic arm and no idea how complicated it could be.

I need an arm that emulates clicking/tapping where I can input intervals in ms between "clicks/taps". No multi axis or smooth movements required. It can be as ugly as hell since it should simply test my lab experiments until they fail. I'm sorry but I don't know the technical terms to describe this machine..

I have a degree in medicine so almost no programming backgournd. But I have a lot of skilled friends!

Devasator DF Robotics

I'm hoping someone can shine some light on a frustrating issue I'm having with placment of componets in the very limited space inside the DF Robotics Devasator. Ideally I would like to use a Mega Arduino for this ambitous project. However the Mega a slight bit larger than the UNO. The L298 board, Arduino,breadboard and battery pack needs to fit into the very limited space. There is space for the Arduino at the front, however there would not be access to the USB port on the Arduino.

Dagu T'Rex Motor controller issues

There are no stupid questions?
Alright. I just started out to build a 6WD using the Wild thumper and Dagu's T'Rex Motor Controller. I got a new T'Rex from Dagu.
When I plugged the board through USB to my laptop, I see both the Motor fault LEDs brightly lit along with the power led.
I am not sure whether the board is faulty or not. Is there any way I can figure out if everything is fine or not? Appreciate your comments!

L298N board Blinking when connected to power supply

Hey Guys & Gals, 
so was trying to run one motor via L298N which was connected to

Can not pull up Raspberry Pi

Hello, I am new to Raspberry Pi and just installed the Raspbian Jessie operating system on my sd card. I use a laptop and the laptop does not have a hdmi port but the docking staion does. Is there any reason that this would not work?


Getting Started With Tamiya Twin Motors / Driving

Hi there!

I'm working on my first ever robot, and I'm afraid to move forward and potentially destroy the parts I have.

I don't even know how to read the wiring schematics / diagrams, so it's very hard for me to understand how to move forward in my project. I would appreciate any links to tutorials online that would help an absolute beginner understand the basics of resistors, etc and why I would need them.

I have purchased an OSEPP Arduino Basics 201 Kit, which came with a bunch of great things for getting started.

A robot for my Raspberry

Hi all,
i need your help for a personal project.

Servo problem

I'm suffering a a bit of grief and a bit baffled why ....


Aluminum Frame

I am trying to build an aluminum frame for my robot but I am having trouble finding good techniques to cut and bend it. Anyone know a good way to cut and bend aluminum for a frame? I have basic tools, but not anything fancy. The frame needs to be about 7.5 inches and relatively sturdy.

Hexapod IK problem

Hi everyone, So I'm trying my hand at making a hexapod and have hit a snag which has me stuck now for a while. Basically I have built the hexapod and started coding it. Now I am trying to do body translation, i.e. the body moves but the feet stay perfectly planted, which works perfectly if I move the body up or down( my z direction). However when I move in the x or y direction, the feet do not stay planted at all. This can be seen in the 2nd and 3rd pic attached where the 1st pic is the starting position.

Servo recommendations

Can anyone recommend a strong servo compatible with Arduino? Ideally I'm looking for:

  • Speed
  • Torque
  • Compatible with existing libraries

I'll have a separate power supply, so the voltage isn't too important.

I'm a newb, so any thoughts/recommendations appreciated from those with experience.

PWM on High Current(amp) Actuators

I'm trying to move up into the category I originally got into robotics for in the first place: bigger buddies!

I have a Raspberry Pi I'd like to use to control some linear actuators, which are 12v and lift about 225lbs. I'm unaware of their amp usage: a search for similar rated ones said ~4-5A. They were purchased from an online auto parts place, so it's unlikely they'd know.

Help with wheel rotation sensing

Hi guys!

Im new to this forum and I am hoping to get a little help with a problem I am trying to solve. I have a small differential drive robot that I want to be able to push through a course and have it record wheel spins to then retrace the exact same path. The goal is to have the robot follow the recorded path and return to the origin point.

Batteries Got Exhausted in Few Seconds

I am building myself a simple robot car.

Simply, an A10 Olinuxino board  (my first false start because of the hard work of interfacing the ultrasmall 0.05'' pins header) interfaced with a Pololu Dual Motor Driver (https://www.pololu.com/product/2130)

To move forward, backward, left an right, I use a simple Web Interface which sends Ajax commands to a Python Web Server I wrote.

Wiper Servo and H bridge woes

Hello All. I have an engine test cell / dyno that I operate the throttle control with a wiper servo.  I set it all up and use a robot power simple H bridge. It works OK.  But recently it the H bridge went to ground.  I think we left the power on all day and stuffed one of the power transistors!

HELP USB AXE027 won't load drivers

I have just assembled the BOT V2.0 with my grandson and went to start programing with the USB AXE027 and found I can not get the drivers to download. What am I missing?