Let's Make Robots!


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3D model of psuedoscorpion

I am looking for a 3D printable pasuedoscorpion for my son. Any help and or hints will be appreciated.

Motee - the tiniest & smartest motor controller in the World


I’m Karol Karczewski, the team leader of Lime Devices group. 
I’m happy to annouce that we have just launched our first campaign on Indiegogo:
The motor controller dedicated for robotics named Motee.

Web Control of Robot (RPi / Arduino) - Software Recomendations


I am enhancing my Arduino Nano based autonomous collision avoidance robot by adding a Raspberry Pi to stream video to a web page and provide manual control of the robot via buttons on the web page with the video stream.

So far I have installed Apache2 weberver and created a web page using Bootstrap with a button on it, I have successfuly connected the Arduino to the Pi via I2C and using a CGI Python script I can press a button on the web page to turn on an LED. 

NASA SpaceX Launch Invitation

Hello LMR,

As some of you might remember, we were recently awarded a small piece in the NASA SpaceApps Challenge.As a small gesture of giving something back to this amazing community, I'd like to invite a fellow LMRian(s) to  join me and a couple of my friends at the NASA SpaceX Launch at the Kennedy Space Center this September. It would be a pleasure meeting you in person.

walking gaits.

I've been building the body of a poppy 3d printed robot to use as my biped Plat form but I'm having trouble grasping the equations for dynamic motion. Essentially I understand it to be a 2 in part; a double pendulum connected at a single point with control using a single inverted pendulum model, then switches over to the other leg and continues the set up. Granted I need to do a lot more programming tutorials to further my understanding but I know I'm going to need a ton of help. Would placing an accellerometer/gyroscope in each foot and one in the head make the system compute better.

Quadrature Decoders

There has been quite a lot of discussion regarding Quadrature Encoders and Arduino. I have typically used Microchip PIC24 with embedded hardware or added external circuity to off load the cpu. I do want to have example code for class.

Autonomous Solar Panel Spider Project (Arduino)

Hello fellow robot enthusiasts/experts,

My name is Michele (Michael) and I'm from Italy. I really appreciate all your efforts and creativity for the love of robotics! It's truly amazing to see all your projects.

diy shoulder axle/pin/shaft/dowel pin?


I would like to 

- create a shouldered pin* in order to glue gearwheels** to it 

- ask you for any advice or link that may hint me towards a solution


any ideas are highly appreciated:

Pololu A4988 and Nema 17

Hi, I'm trying to build a balancing robot. I bought 2 x A4988 driver and 2 x Nema 17 motor.


hi !
 we are creating a drawing machine that does mistakes and turns red (LED)

does Balancing Robot PID values become obsolete as motor battery diminishes?

Hi All,

I'm wiring up yet another attempt at a balancing robot (smoked a motor driver IC last time) and I just thought of something.

If I connect the motor driver to a 12V battery, then tweak my PID parameters, everything is going to go smoothly at first.  But then when the 12V battery diminishes, to say 9V, the motors will be a bit less responsive, and then I'd have to go ahead and tweak the PID parameters again.

Wild thumper trex controller wifi receiver problem!

Recently, I have bought a wild thumper 6wd with a trex controller to make a robot.

General printer recommendations, delta vs xyz

I'm looking to get a new printer or printer kit. My printer head seems to have bit the dust and the Robox printer head is a large part of its cost?

Because of a change in circumstances, I am planning in living in an RV within the year. RVs are a bit hard on delicate machinery. Imagine a medium earthquake happening whenever I move.

Thermistor error with the MK8 extruder.

Dear: LMR

STL Viewer (beta)

Rotate: |

Arduino Mega 2560 + Dagu 4 Motor Controller

I am currently working on a line following car project.

I am quite new to electronics and it would be no surprise if I miss something basic in the theory side.

I am trying to control 4 motors using my Dagu 4 channel motor controller and Arudino Mega 2560. I am having power problems and after researching and some testing, I am quite clueless about what exaclty is wrong.

I have programmed the arduino mega to set the direction pin to HIGH and the PWM pin to 255. I have 2 setups for testing.

Controlling lot of LEDs in parallel with Arduino & transistor

Hi all,

Got some questions about using trnasistor and resistor with lots of LED all together. I am not good in electronic planning but only drawing sketch out as image below.

Try to using as less resistor as possible so I only plan to use one and I know Arduino couldn't handle that many LEDs so transistor will be used as I know. However, I am not sure how to connect these points as identify in image below from A~G. Can anyone help me or sugeestion how this should be connected and what type of transistors, resistor should be used?

Capacitors for smoothing servo current surges

I've built what I thought was a nice clean approach to the oft-recommended practice of parking a 470uf cap on the power lines to my servos. I have 6V coming from my voltage regulator to the postive/negative bus strips on a small PCB. I've pulled a positive and negative wire off of the bus for each servo (3 servos total) and put a capacitor across each pair of wires. One servo should then connect to each pair of wires.

Adding a Raspberry Pi Camera to Elf the Robot

Robots are a lot of fun.

Robots that stream video over WiFi are even more fun!

Elf Raspberry Pi Robot @ http://Mikronauts.com

(click on image for larger version)

Dagu Rover 5 PWM Settings

Hey All,

So I've been building a rover using a (Dagu) Rover 5 Chassis, a Rover 5 Driver Board and an Arduino Uno.

It's wired up fine and I can send instructions back and fourth to the motors no problem but what seems to be an issue is the speeds which the motors are turning at. If I can set the speed at 100 (i.e.