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Software / Basic stepper motor control (Arduino Uno and 28BYJ-48 steppers)
« Last post by StanD on April 08, 2014, 04:50:25 PM »
A while back I "discovered" stepper motors, when my eBay package with 2 little 28BYJ-48 steppers and 2 ULN2003 drivers arrived. Given a total price of less than $8 shipped, I figured there is not much to loose. I have to say that I am quite impressed with the result. Steppers, even cheap ones like these, seem to be great for small robot projects where you want some more accuracy in performance, but do not want to implement a complex closed loop systems with wheel encoders, accelerometers and gyros. Here is a quick video of the result:

StepperBot: 28BYJ-48 Stepper Motors, UNL2003 driver and Arduino Uno

I posted more details, wiring diagrams and Arduino code (using the AccelStepper library) on my blog:
Electronics / Re: Sending emails
« Last post by vipulan12 on April 08, 2014, 04:24:09 PM »
alright, thanks for the links
Mechanics and Construction / Re: high torque-low voltage geared BLDC motor
« Last post by thandar on April 08, 2014, 11:23:58 AM »
at first thanks for the immediate response.

speed isnt a problem for me, I wouldnt mind to get that torque even at 3rpm or 1rpm as u said. Im looking for bldc cause I wanna have the motor as compact and light as possible. and I wanna keep the voltage low cause Im planning to use batteries to power the robot
Mechanics and Construction / Re: high torque-low voltage geared BLDC motor
« Last post by jwatte on April 08, 2014, 10:22:29 AM »
For equipment as heavy duty as 500 Nm, you will not find "hobby" style stores that carry these.
You will have to look at industrial supply companies that specialize in motion control.
Also, for that level of torque, you may need to look at AC induction motors, as permanent magnet based motors may not be available that can achieve that.

How fast do you need the shaft to spin at? Achieving 500 Nm at 1 rpm is going to be a lot simpler than achieving 500 Nm at 100 rpm!

It may be that the power you need requires you to go to electric vehicle type motors. These typically require drive voltages higher than 24V -- the Nissan Leaf runs at 400V, and has 280 Nm of torque. But, again, what speed you need is an important factor.

Places that sell this kind of equipment can be found on Google -- just look for "motion control."
Expect to spend many thousand dollars for the motor, and as much more for the control/inverter circuitry.
Mechanics and Construction / high torque-low voltage geared BLDC motor
« Last post by thandar on April 08, 2014, 09:39:11 AM »
hey everyone,
Im designing a robotic arm and looking to combine a 12V or 24V bldc motor with a suitable gearbox in order to give me torque up to 500Nm. Do u think thats posible? if so can u suggest any particular geared motor?
I dont know if it is allowed in this forum but can u also suggest me some online shops for motoros and gearboxes? thanks in advance  ;)
Mechanics and Construction / Re: [advertisement] New Stepper Motor Mounts
« Last post by venturemfg on April 08, 2014, 01:19:07 AM »
The configuration sounds good. This might will able to handle a heavy loads. Can you please share  about how stepper motor is integrated?
Electronics / Re: Wired PS2 Controller for wheeled robot
« Last post by jwatte on April 07, 2014, 03:13:30 PM »
Actually, I realize that I didn't properly answer the question: You said "without using a microcontroller."

No, you cannot control a motor controller directly from a PS/2 controller without using a microcontroller in the middle. You need a microcontroller to read the SPI data from the PS/2 controller, and write proper control signals to the motor controllers.

The closest you may be able to come would be to use a motor controller with built-in microcontroller, like the Orangutan from Pololu. But you're probably better off just using a motor controller (or motor shield) and an Arduino Uno.
Misc / HGR Industrial Surplus - Used Industrial Robots/Parts
« Last post by PTD on April 07, 2014, 12:55:35 PM »
We currently have in stock 61 robotic items, from full industrial robots to parts, controllers, etc. that members of the forum may find useful.  You may follow this link for additional information: http://bit.ly/1emB7DA

Please feel free to visit us at www.hgrinc.com
Misc / National Robotics Week Sale!
« Last post by ServoCity on April 07, 2014, 10:22:50 AM »
SAVE up to 50% during our National Robotics Week Sale! Save on wire, controllers, extensions and MORE!

Hurry, sale prices valid NOW - April 10th!


Electronics / Re: Wired PS2 Controller for wheeled robot
« Last post by venturemfg on April 07, 2014, 12:45:59 AM »
You need to add/modify some configuration files. The link sent by jwatte can be helpful for you. Also check out for different conf files for the controllers.
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