Let's Make Robots!


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Stencil for Fun Light Switch Box

I just received a Fun Light Switch Box kit from Jameco.  The instructions call for a stencil to be found at http://letsmakerobots.com/files/userpics/u5293/Fun Light Switch Box Stencil.pdf. A request for that site yields a Requested Page Not Found window.  How can I find this stencil, which is essential for my putting this kit together?

T'Rex Robot Controller Board Discontinued ???


Has the T'Rex Robot Controller board been discontinued?

I can't seem to find it in stock anywhere. All the sites I've checked has it listed as "Unavailable, Unknown Restock Date".

If so, why has it been discontinued?

And is there another board that is coming out to replace it?

full sized robot guidance

hey guys 

I just finished salvaging a power wheels kids three wbeeler

I plan on upsizing my avoidance robot

to this frame and do what needs to be done

with motors.

I have a question and I am confused

This toy has only one motor and a gearbox i supise

How do I go about using this or can I

I am wondering how this works


Switching to Arduino

I was a basic stamp2 guy, I planned on using the Propeller for my next big robot, but instead of learning spin, I might as well learn whatever arduino uses, besides Arduinos have ADC's which I need and are fully compatible with Pixy, which I already bought. Question, what's the best (or really good) arduino for Phydo: http://letsmakerobots.com/robot/project/phydo-0 (Large, at least 6 servos, plus dc motors, at least 8 adc, tons of I/O, voice, speech, vision, etc) I was thinking Mega 2560 R3, (but not if it's going to be obsolete next month which usually happens to me) Should

3D model of psuedoscorpion

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

Arduino Speech Code

Based on a talking-lift-buttons project published on instructables (credits to ICstation); I have modified the schematic to the following:

- Arduino Nano controls the audio storage chip APR9600 which includes 8 messages.

- Arduino generates random 8 numbers

- each number calls one of the 8 messages.

The result, it will look like as if the Arduino is talking out of its own mind.(more realistic if we extend this systems into say 50 phrases or more which may need a different audio storage module than APR9600)

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

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