Recent Posts

Pages: 1 ... 4 5 6 7 8 ... 10
51
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.

Cheers,
52
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!  :)
53
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.

Cheers,





54
Software / Re: Webbotlib Studio FBoot only works the first time!
« Last post by Hero I on October 06, 2014, 07:29:31 PM »
I changed BOOTSZ to 512W_7E00 and the problem still exist.
55
Misc / HGR Industrial Surplus - Used Industrial Robots/Parts
« Last post by PTD on October 06, 2014, 02:13:57 PM »
We currently have in stock 79 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/1BJuhmG
56
Electronics / Re: Build motor control cirtuits for 4 wheel robot 6V ~2A stalled current
« Last post by jkerns on October 06, 2014, 01:49:12 PM »
Start with the  data sheet for the L298, it will tell you most of what you need to know to make your motor control circuit.

The data sheet lists the logic inputs needed to make it work - basically you need enable (off - high impedance on the outputs), and two inputs to set the direction for each motor (the L298 will drive two motors). Each of these logic is typically driven by a digital output from your controller. Putting a resistor between the controller and L298 on each of the logic connections can reduce the chances of destroying the controller when you blow the L298.

The two devices will need a common ground.

Motors connect to the out 1/2 and out 3/4 pairs.

Sense A and B can go directly to ground with no resistors unless you need to measure the motor current.

There are lots of H bridge tutorials around on the web and youtube to help you along. I have some on my channel https://www.youtube.com/playlist?list=PL30C02F65B2D5C320 , but they reference a different chip and are pretty boring.

57
Software / Re: Webbotlib Studio FBoot only works the first time!
« Last post by Webbot on October 05, 2014, 06:27:25 AM »
I think you should try changing the BOOTSZ to be the same as mine. (Wont cause any damage - after all that is how I have mine set).

I have a theory as to what is going on - and so if the above works then I'll explain it
58
Robot Videos / Planning for a low cost telecommuting robot
« Last post by Teknicalissue on October 04, 2014, 10:00:57 PM »
Hey guys!

I'm on a mission to create a low cost robot that is controlled via laptop. So far I've created one for $990 and was wondering if you guys had any ideas on where to find parts like the base and DC motors for a cheaper price than what I paid for it which was $200.

I've uploaded a video of my robot on my blog here: http://thecodingpatch.blogspot.com/2014/10/as-promised.html?m=1

The servo linear actuator I purchased for the neck extension was $300 and I think I may be able to find one for a much better price.

What do you guys think?
59
Software / Re: Webbotlib Studio FBoot only works the first time!
« Last post by Hero I on October 04, 2014, 02:24:43 PM »
My fuses match what the SoR's Axon II FAQ section says they should be set to.

Attached is an image capture of my Axon II's fuses settings.

One thing I noticed is that BOOTSZ and Fuse Register HIGH value are different than yours.
60
Electronics / Build motor control cirtuits for 4 wheel robot 6V ~2A stalled current
« Last post by RpiHacker on October 04, 2014, 12:58:37 PM »

I have spent hours searching the web for project plans / DIY information on how to build 6V motor control circuit for a 4 wheel bot that is equipped with motors that have a stall current of 2A.  I am specifically looking for plans based on the L298 IC as the info I have found to date indicates the L298 is a good choice for this project.

The bot is to be Raspberry Pi controlled.

My intent is to build most of my own circuits starting with a variable power supply and NiHM battery charger in one project box to support the bot. Both circuits are in the parts purchasing stage.  It took a while to get information to build these two items; however, no where nears as long as I have already spent on trying to find DIY info on 6V motor control circuits.

Building a robot from scratch is a journey not an event; so hopefully, my journey will not be disrupted for lack of motor control plans. Therefore, I would appreciate any advice on finding a schematic and, or project plans that can be used for this application.

Regards,

Pages: 1 ... 4 5 6 7 8 ... 10

Get Your Ad Here