Recent Posts

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1
Electronics / charging two diffrent types batteries with one charger
« Last post by aaa3a on March 09, 2020, 06:10:28 AM »
hi
i have a robot work with two batteries one for the microcontroller and low consuming power circuits (2x 3.7v 18650 battery in series with total 7.4v )
and one for the motor and power sucker stuff (6v/4ah sealed lead acid battery)

i've wired it as shows in attachmed  photo
i used toggel switch to switch between operation mode and charging mode

my problem is the 7.4 battery charge well but the lead acid still 2.4v
i left them to charge for 12 hours

the lead acid battery charging alone very well to 6.9v

is there a solution for this system and what is the right way to charge the 2 batteries

thanks


2
Software / please help webotlib page is no longer exist
« Last post by aaa3a on February 28, 2020, 03:26:08 AM »
hi folks
i've used axon II long time ago and now after returning to my robot i found that webbotlib web page is no longer exist and the project designer too
what happend to this software and how can i program my robot now?
is there another mirror link ?


thanks
3
As the title said, i'm actually interested of making a prototype that has the exact same design as those drones. But will it work and move like the in-game version?
4
Misc / major database corruption - I think it's "fixed" now?
« Last post by Admin on January 24, 2020, 05:12:37 PM »
Had to move web hosts, and a lot of fubar happened during the move that corrupted the database.

I believe all errors are fixed and no data was lost. Only my hair was lost.

Post here if you find anything wrong.
5
Mechanics and Construction / Re: [advertisement] New Stepper Motor Mounts
« Last post by Peterlovediy on December 11, 2019, 02:10:41 AM »
The new designed NEMA 17 Stepper Motor Alloy Steel Mounting Bracket can match standard Nema 17 stepper motor, and also include the mounting holes for Nema 17 Economy Planetary Geared Stepper Motor.

https://www.omc-stepperonline.com/nema-17-bracket-for-stepper-motor-and-geared-stepper-motor-alloy-steel-bracket-st-m1.html
 
6
Electronics / Re: PCB assembly company recommendation?
« Last post by Abby123 on December 05, 2019, 01:08:06 AM »
Not sure if you are considering a Chinese PCB manufacturer if you are considering. May wish to know about WellPCB; a promotional event is being held, 5pcs, 1-2 layers, 100 * 100, only $ 5,
I think the USB2AX Dynamixel adapter uses it.
7
Robot Videos / Re: make your own printed circut board
« Last post by Abby123 on November 27, 2019, 01:33:43 AM »
You can use WellPCB's circuit board to make your robot circuit board. They are holding a $ 5 promotion and it's a great deal!
8
Mechanics and Construction / Robot Arm for 3D scanner
« Last post by Julian D. Powell on November 19, 2019, 08:21:57 AM »
Hello fellow community members.

What do you think of my new project? I'm considering building a robotic arm for my Kinect (or for any affordable 3D sensor), something like this, but much simpler and cheaper of course, with 4 or 6 degrees of freedom, compatible with Raspberry Pi. How real is this even as a DIY project? Can anyone point me in the right direction? I have some experience with 3D printing and very little with Raspberry Pi projects.
Thanks for any help in advance.
Julian.
9
I am building a quadruped robot using a five-bar coaxial leg mechanism modelled after Ghost Minitaur. I need to calculate the torques generated at the joints to select an appropriate motor. Can anybody give me advice on how to make these calculations and if there is any software i can use to calculate them. I am extremely new to this field and any help will be appreciated. Any recommendations on motors would also be highly appreciated.
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