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robot controller

Posted: Fri Dec 07, 2018 12:47 am
by Will5455
Does anybody know of a good robot controller capable of 6v with variable speed who is not a hat?

Re: robot controller

Posted: Fri Dec 07, 2018 1:04 am
by mikronauts
Do you mean motor driver?

PWM allows speed control with geared motors.

Or do you mean stepper motors or servo's?

You should also post the maximum current your motor may need.

Please post a link to the motors web page.
Will5455 wrote:
Fri Dec 07, 2018 12:47 am
Does anybody know of a good robot controller capable of 6v with variable speed who is not a hat?

Re: robot controller

Posted: Fri Dec 07, 2018 3:00 am
by Will5455
yep meant motor controller not rbot controller!

https://www.dfrobot.com/product-1477.html
this is the set of stuff

Re: robot controller

Posted: Fri Dec 07, 2018 3:18 am
by mikronauts
Good looking chassis!

From their site, I would get

https://www.dfrobot.com/product-1534.html
Will5455 wrote:
Fri Dec 07, 2018 3:00 am
yep meant motor controller not rbot controller!

https://www.dfrobot.com/product-1477.html
this is the set of stuff

Re: robot controller

Posted: Fri Dec 07, 2018 12:56 pm
by Will5455
it seems to output a minimum of 6.5 or 7 volts (I am not to great with data sheets yet) so would that kill it? it is a 90 buck set and that is a little much to frie because I don't know what I am doing.

Re: robot controller

Posted: Fri Dec 07, 2018 1:55 pm
by mikronauts
From chassis spec

Rated Voltage: 6 V
Operating Voltage Range 2~7.5V

From driver board

Voltage supply: DC 7 ~ 24 V
Voltage supply limit: 6.5 ~ 27 V

Note motor drivers drop 0.5v ... 1v from their supply voltage before "feeding" the motor

However you can get any driver board as long as it can supply 2.3A per motor.
Will5455 wrote:
Fri Dec 07, 2018 12:56 pm
it seems to output a minimum of 6.5 or 7 volts (I am not to great with data sheets yet) so would that kill it? it is a 90 buck set and that is a little much to frie because I don't know what I am doing.

Re: robot controller

Posted: Mon Dec 10, 2018 5:11 pm
by Will5455
THANK YOU!

Re: robot controller

Posted: Mon Dec 10, 2018 5:15 pm
by Will5455
now a important question. Any battery for at least 30 minutes of playtime?

Re: robot controller

Posted: Mon Dec 10, 2018 6:32 pm
by mikronauts
Assuming 1A load while moving @ 7.4V, with two motors

2 * 1A * 0.5h is 1amp-hr capacity for an rc nimh or nicad 7.4v battery pack

But, it is best to test this in real life, as it depends on weight of robot, surface you are on, speed and more.

Btw, use a separate usb battery pack for the pi etc
Will5455 wrote:
Mon Dec 10, 2018 5:15 pm
now a important question. Any battery for at least 30 minutes of playtime?

Re: robot controller

Posted: Mon Dec 10, 2018 6:35 pm
by Will5455
hmm maybe use a 2 ah for the purpose of making sure?

Re: robot controller

Posted: Mon Dec 10, 2018 6:41 pm
by Will5455
also maybe a link because I am new to this?

Re: robot controller

Posted: Mon Dec 10, 2018 6:59 pm
by mikronauts
My friend, go to a local rc hobby shop, or google for 7.4v rc battery pack, 2ah :)

I do drive by help posts here im my coffee breaks and when compiling code or flashing chips, I usually do not have time to also do the googling leg work for those I help.
Will5455 wrote:
Mon Dec 10, 2018 6:41 pm
also maybe a link because I am new to this?

Re: robot controller

Posted: Mon Dec 10, 2018 8:00 pm
by Will5455
I live in a little town you have never heard of known as harrisonville mo

Re: robot controller

Posted: Tue Dec 11, 2018 2:06 am
by mikronauts
One example: https://www.amazon.com/Venom-5000mAh-Ba ... B000VUF3O2

There is a hobby shop in your town

https://www.yellowpages.com/peculiar-mo ... =530737830

Took me 10sec to find via google
Will5455 wrote:
Mon Dec 10, 2018 8:00 pm
I live in a little town you have never heard of known as harrisonville mo

Re: robot controller

Posted: Tue Dec 11, 2018 2:53 am
by Gavinmc42
Those are probably one of the best looking tracks on a tracked bot I have seen.
I want some :D

I prefer 12V motors running at lower speeds and lower current, with 8-10 AA NiMH cells.
Brushless motors are getting more affordable, gearboxes are still the issue, too noisy.
Magnetic gears are now entering mainstream, low cost hobby magnetic gear box?

Re: robot controller

Posted: Thu Dec 13, 2018 1:03 pm
by Will5455
mikronauts wrote:
Tue Dec 11, 2018 2:06 am
One example: https://www.amazon.com/Venom-5000mAh-Ba ... B000VUF3O2

There is a hobby shop in your town

https://www.yellowpages.com/peculiar-mo ... =530737830

Took me 10sec to find via google
Will5455 wrote:
Mon Dec 10, 2018 8:00 pm
I live in a little town you have never heard of known as harrisonville mo
that is in peculiar I am in harrisonville!