Let's Make Robots!


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

ICs chips for sale

If you're looking for IC chips for your project now, this is the greatest offer to go.

30% OFF on all ICs chips on ICStation

Thanks and enjoy your day!


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.

Hexapod problems with servos jittering

Hi everyone,  I am currently hands on an Hexapod, based on the same eBay kit as some other members, servos MG996R and then I want to control it via Arduino Mega 2560, in the meantime my tests are being done with Uno R3.

At the very end, I want to do some AI stuff thanks to ROS being executed in a Raspberry Pi also contained in the Hexapod.

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)

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Hot Item: DSO138 2.4" TFT Digital Oscilloscope DIY Kit

This item is highly recommended now.

100pcs had been sold in several days.

It's on sale for USD26.99 now. ONLY 6pcs Left.

Hurry up to enjoy the offer.

Have a nice weekend!

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.

Trex Motor Controller i2c read while using rc

I am starting to put together a rover using Wiild Thumper and the TRex motor controller.

I am having some difficulties getting i2c working reliably from a Raspberry Pi 2 running Ubuntu 14.04

While I am continuing to research my issues (possible future post coming) I decided to give the RC connection a try.

My question is if it is possible to access the i2c read only while using the RC as I would like to try out code for monitoring the current draw and battery voltage.

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?

World Maker Faire NY 2015!

June 11, 2015:

I'll be hosting a Google Hangout this evening at 4:00 PM EDT to do some planning for the faire. It will mostly be Rick and I, but anyone is welcome to join and contribute. Reach me on Google+ if you want to be added. (https://plus.google.com/+AndrewTerranova/posts)


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.

robot stores at canada near Ottawa

Does any one knows some robot store that sells some microcontroller and so on


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.

How to build a Arduino room to care a flagging tree scientifically?

Here is a flagging tree in our office, but due the busy work and the room are not suitable for the tree’ s growth, it is flagging now. I read a short elecrow blog about a project making use of kinds of crowtail modules that aims to collect the data of the tree such as light strength, soil moisture, temperature and humidity of this tree. In this way, people can know the current situation of the tree and then take actions accordingly. 


Grownups only

"Gigahoes."  I've only watched the first one.  Not Citizen Kane but there are a few good laughs.  (5yr+ LMRians will know how my tastes run.)

G-code Slic3r error: Existing work directory required?

Dear: LMR

Hello guys this is Noah again. Recently I have finished the software on my Prusa I3 where I am following the directions for how to print something and nothing happens when I slice with slic3r. Instead this image appears.

Voice controled Raspberry robot

I want to make a voice controled raspberry pi robo. I am using rapberry b+ .Pls help me which audio device to use and how can I programe it?

The <20€ European open robot kit(work in progress)

The purpose is to make a bill of material to make an easy to build, easy to hack, cheap and full of features robot.

There are various builds, so it's better to list components that fit the bill (easy to use, cheap and readily available from arduino kits and chinese e-commerces)