Let's Make Robots!

expandable processor

Which processor board is easily expandable? What if you suddenly end up needing more inputs/outputs

I'm afraid that when I create my robot project, I will eventualy end up using all the inputs and outputs and will need to change the processor board.

using Multimeter as current sensor - can it output to Arduino?

Hi All,

I'm in need of a current sensor, but don't want to wait 40 days to get it shipped from China, or want to pay over 10 times as much buying it locally.

I have an old cheapo multimeter lying around, and I just opened it to see if it had a current sensor IC in it.  It didn't, and now that i've put it back together, the conductive rubbery strips that press against the LCD are misaligned and the display shows me gibberish.

Sonar RADAR GUI Windows APP (SensorVal,Degree)

UPDATED 3 Sonar Sensors 360 Degree - 120 Degree Servo Rotation

Improved for multi sensing. You can now use THREE Sonar sensors to display on a graph.

Improved Serial port handling, Wire-Tension is coming soon, Serial Port Availability[Menu Item] is also coming soon.

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?

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

Choose a motor stepper driver for Nema 17

I have 2 stepper motors Nema 17  (model and data sheet : https://s3-ap-southeast-1.amazonaws.com/...20RevA.pdf).

Do you know a good cheap driver for this motor?

I tried with pololu A4988 driver, but I don't like it. It doesn't have enough Output Current and I broke it.  


Join the *LMR 3D Print Club*

Do you have a 3D printer?


Interested in getting prints done, but have no printer?

Let's help each other printing more stuff :)

There may be a 3D printer or someone who'd like to pay for a print close to you..

Geneva mechanism on Arduino

I am trying to make a Geneva wheel using Arduino.

The hexagon Geneva magnificent mechanism allows a rotating wheel to stop at each of 6 steps on the wheel for a short while and them move to the next one. It can be designed for octagon, pentagon, or anygon..

see this link abot Geneva mechanism


Below is a suggested code for a 4 stops using a sensor on arduino. Can anyone comment if it works ?



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?