Let's Make Robots!

Designing the chassis

Hi ! 

Im trying to make my first robot chassis. I ran into some problems: Where to make the holes for the tires and such. My concern is the things wont align up so the wheels wont be straight. I saw some of you guys having these super cool design plans where everything is straight and good to go. How do you make these? What programs do you use? 



T'REX Controller on Wild thumper 6WD

Hi, I just put the new T'rex controller on my Wild thumper 6wd, and i put the bluetooth module to controlled by my smart phone, but the problem is , it's running very slow, and lack of power.......

Robot Self Defense

Robots or biomorphs (robots modeled after living creatures) are commonly fragile especially as you move to a smaller scale.

how to get arm middle-segment to rotate 360, while rest of arm stays still?

Hey everyone,

I saw a video a while back of a motoman robot cycling through some movements.  One of the things it did was stick its arms out straight, and then begun to 360 degree rotate a middle section of its arm, while the adjacent sections stayed put.  How did it accomplish this without twisting the wires inside?  Heres a pic to help describe what i'm talking about:

Arduino Mega 2560 R3 Qusetion

Hi All, I am currently using Arduino Mega 2560 R3, with the Rover5 explorer board, I have load to code but the unit is not working properly, My question is, Do I need to prepair the Mega R3 in some way, before I load the program, or when you load up a new code, does it write over the old cde.




Rover 5 Power up http://youtu.be/NP9d5ouBVTE

cordless drill electric brake + stepper motor = saving power while not moving?

Hi All,

I've been trying to find out how the electric brake in cordless drills work, but am having no luck.  The appear to be able to stop the drill motor instantly with no wind-down.  

If anyone knows how this system works, can you provide a brief description or point me in the direction of where to go and learn about it?

What I had in mind was applying this type of braking system to a stepper motor of a balancing robot, so that I could save power, during those moments when the balancing robot is balanced and the motor is not moving.  

Free trial 24 channel Veyron Servo Controller

It's time again, go and grab your free 24 channel Veyron Servo Controller. All you have to do is write a comment there or shoot the DFRobot guys an email. We would really like to see a review after you tested the controller.


Rover 5 Explorer board Question

Hi, I am currently assembling my Rover 5, I have connected the Motors, encoders and the batteries  (6 x NiMh AA,s).

I plugged in a 12vdc 1amp plug pack, and flipped the power switch to charge, After about 15 - 20 seconds, I noticed a smell and turned the charger off, I went over both sides of the board and all looked fine, I did find however, the Resistor directly behind the power switch, was warm to hot.

Charging a Lithium (LiFePo4) battery in place


Groucho's (a wheelchair based robot) battery is a monster 90 lbs of battery (24v, 100 amp-hr).

I'm hoping to be able to just turn off the robot and then disconnect the load (the battery is connected to the power distribution system via an Anderson PowerPole) and hook it to the the charger.

Hopefully this is not risky.

What I want to eventually do is to have Groucho plug himself into the wall socket himself. For that I'd need a lot of things to happen in the right order, with testing.

smart way of turning around

I've seen these 1 motor walkers before, with the big disavavantage that they can only walk straight forward.  Look how smart this is solved on this robot by adding an extra wheel :)

Homemade Remote Controlled Walking Robot: http://youtu.be/zrbTm6BFO_U