animator28
United Kingdom
Asked
— Edited
Resolved by Dunning-Kruger!
There is a company in india making these awesome cheap boards (way cheaper than using sabertooth) that turns dc motors with encoders.
Into positional servos.
They have arduino code already and I am wondering if this can be translated into the ezb v4 platform thanks
here is the link
https://www.youtube.com/watch?v=kZePOyxjhMY&t=460s
Or do we have script templates already for this?
Related Hardware EZ-B v4
To be honest you can turn any DC motor into a servo (7.4v or less but not sure what size motor you had in mind) by simply removing the electronics and potentiometer out of a cheap hobby servo and using that to control the dc motor... The potentiometer would be attached to the output shaft of the final drive gear... Probably much cheaper and with ARC no coding would be required...
https://www.thingiverse.com/thing:4166931
I have made a EZ panel for it using hbridges. Which fine and the head moves great.
I know by adding a pot to a rotation of a robot joint works.
I have read all of the material on here about the subject (really i mean it all of it)
I am guessing if its just serial communication I can just use the sabertooth script and communicate with the board with the commands on there website. When I do the legs and arms for this robot
I will have to have to use bigger DC motors so these boards are fantastic for that only about 12 euros each giving them pinpoint accuracy to any DC motors. taking pots apart is a fiddly process especially if having to be done 20 to 30 times for each motor.
And then its an extra bulk on robot builds to have
Let the Arduino do the light lifting of little high priority loops like this. And let the Ez-b do more heavy lifting of sending instructions and such.
That’s what I would do anyway. Although, another option is to use the Ez-b with a usb cable and then you could safely rely on tight loops like this. But again, I’d probably still use a few Arduinos as slave
Cool thank you.
So the script is stored on the arduino (slave) And the EZB will just trigger any arduino script. Super nice
There is a tutorial on here to talk to an arduino so its pretty straight forward from now on
Awesome
The tutorial was to turn an arduino into an EZB. That is awesome I know a few in the past have asked for this
Could you give an example on how to use an Arduino as a slave and how the ezb triggers any Arduino script?
If you have time
Thank you
I don't know how to use an Arduino as a slave and how the ezb triggers any Arduino script,
But I use the Arduino with the ARC software with many of my projects with servos, makes it EZ :-)
EzAng
also, i do have a slight concern with the encoder wheel as a servo. While it’ll kinda work, there’s going to be a margin of error. And over time, it’ll move out of position. And each time you use it, every encoder wheel servo will need to be recalibrated.
if you could add a potentiometer to each joint, as Richard r pointed out, it’ll be more reliable and easier to use. It’ll decrease setup time as well.
my recommendations for that is to connect a servo pcb to a more powerful hbridge. This gives the hbridge the ability to become a servo.
Yea getting out of sync over time is not an option. Each Motor has the encoder built in
Taking a servo apart and using the board to connect to a pot then the hbridge
You guys are right its just quicker
Thats really cool
I will probably just do that
It seems in robotics there are many different solutions to a problem