Recent Posts

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Robot Videos / Re: Automata (new robot movie trailer)
« Last post by shina on October 08, 2014, 12:28:15 AM »
Online Watch AUTOMATA HD Movie >>> http://goo.gl/YOOvv2

Software / Re: Webbotlib Studio FBoot only works the first time!
« Last post by Hero I on October 07, 2014, 07:47:17 PM »
Attached you will find the bootloader that I'm using and my program.
Misc / disabled person needs help with setting up microcontroller
« Last post by dmehling on October 07, 2014, 04:12:35 PM »
I am a physically disabled person, and I have some simple electronics projects I would like to build in order to help me operate some devices.  For example, I need a way to turn pages on a Kindle.  I was thinking of mounting a servo on either side of the device in order to push the buttons to turn pages.  However, I cannot do this myself, and I don't know anyone who can do it.  Are there companies or individuals that will set up a microcontroller that is interfaced to a servo, or any similar kind of electronics project?
Misc / Pololu Robotics Halloween Sale
« Last post by bens on October 07, 2014, 01:59:00 PM »

Hello, SoR!

We are having our first-ever Halloween sale this year, with discounts on an assortment of products you can use to make awesome costumes and extravagant yard displays.  From now until October 22, you can get 10% off hundreds of products, from servos and LEDs to sensors and programmable controllers. Even bigger discounts of up to 30% are available on a few select items. See the sale page for more details and the full list of products.

We would love to hear about anything cool you make with our stuff, so please share it with us! This month, we'll be posting a series of simple Halloween-themed projects of our own to help inspire you.

Happy Halloween!

- Ben
Mechanics and Construction / Uni-directional ball screw alternatives.
« Last post by rodrigonramon on October 07, 2014, 12:47:09 PM »
I am trying to find a one way ball screw to use on a machine I am building.

Basically what I would need is a small spring loaded ball screw with a good amount of threads to spin a motor.

Imagine a yankee screwdriver, but instead of focus on force and bi-directional movement,
a focus on spins and uni-directional movement.

I want a recurring movement to spin the ball screw causing the motion to spin a motor to cause a voltage.
Then when the pressure is released from the actuator, the ball screw would slide back up to starting
position and then begin to spin again when the force is reapplied.

I am not technically married to the idea, and any other suggestions to improve on this would be appreciated.
I also considered using a regular ball screw connected to a regular motor and then using a full wave
rectifier to fix the alternating voltage and create a DC voltage.

Ideas? Improvements? Flaws?
Software / Re: Axon 2 stuck bootloading
« Last post by Webbot on October 07, 2014, 12:18:59 PM »
Do you have a hardware programmer - eg AVRISP MKII or similar?

How big is your program? Perhaps a screen dump from the end of the compile.
Software / Re: Webbotlib Studio FBoot only works the first time!
« Last post by Webbot on October 07, 2014, 12:14:10 PM »
Hmm - works fine for me  :) . I need to do some experimenting to see if I can reproduce your problem.
In the meantime make sure that:-
  • Your hardware programmer is physically disconnected before using the bootloader
  • When re-programming the board then leave it off for 5 to 10 seconds before re-programming via the bootloader
  • Send me a copy of your project .hex file - just in case that is the problem (for any strange reason!)
No worries - that is very funny. Hopefully, I was not viewing the future when I typed that!

Clearly, I never learned to type and think at the same time and the sad thing is I proof read the post.

Electronics / Re: Build motor control cirtuits for 4 wheel robot 6V ~2A stalled current
« Last post by jkerns on October 07, 2014, 08:56:13 AM »
Jkerns - thank you for taking the time to help me short out H-Bridges.
Sorry - had to laugh!  :)
Jkerns - thank you for taking the time to help me short out H-Bridges.

Your posted advice was very helpful as were the Geoffrey Thorpe videos.

At this point I see a way forward and am confident I will be able to plan and build a functioning H-Bridge with PWM to control the bot motors, while minimizing circuit smoke!

The only piece of the planning puzzle left is learning about how to add feedback loops using encoders on the motors to ensure the motors are working together and doing what the code /sensors tells them to do.


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